From: jeremy y. <jcy...@gm...> - 2018-06-04 02:31:53
|
Update, I pulled this other ametek motor apart. And it had a glass disc encoder, only 4 wires and clearly labeled a,b,5, gnd , so no blown opto when I hooked it up. The glass disc said 1000 on it so I'm presuming it's a 1000 PPR encoder, I will check part numbers tomorrow . Hooked it to 7i90 and it just works. Finally, something that didn't fight me tooth and nail. Now I have to put an encoder on the z motor and wait for brown to drop this 6hp spindle motor off and see what I need for that, I have 2 drives coming for that and a bid on a power supply for the drives so life is well at this time. Ttyl take care fellas |
From: Gene H. <ghe...@sh...> - 2018-06-04 03:49:15
|
On Sunday 03 June 2018 22:31:32 jeremy youngs wrote: > Update, I pulled this other ametek motor apart. And it had a glass > disc encoder, only 4 wires and clearly labeled a,b,5, gnd , so no > blown opto when I hooked it up. The glass disc said 1000 on it so I'm > presuming it's a 1000 PPR encoder, I will check part numbers tomorrow > . Hooked it to 7i90 and it just works. No Index??? Seems like it would be handy. OTOH, for XYZ, not a hard and fast requirement as long as the home switches are good. But you'll need it on the spindle. In fact, the index is the only thing that must be tied to the spindle if you ever want to do rigid tapping. The rest of the encoder (a/b signals) can be on the motor, and you can calibrate the scale for the spindle with some hal stuff you can comment back out of the hal file once the scale has been determined. Thats how I did mine anyway. Works a treat. > Finally, something that didn't fight me tooth and nail. > Now I have to put an encoder on the z motor and wait for brown to drop > this 6hp spindle motor off and see what I need for that, I have 2 > drives coming for that and a bid on a power supply for the drives so > life is well at this time. Sounds good. How much weight do have to man handle on the Z? > Ttyl take care fellas We try. I've got the tap hat g-code working well, but ran out of M6 grub screws, so I just ordered another 100 M6's and 100 M8's for the biggest taps, which should run me out of brass before I run out of taps to mount. So sometime after the screws get here, I should order another 6 feet of 7/8" brass rod. And a decent set of letter drills, these are only slightly better than cold butter. Even running each one thru one of the original drill doctors isn't enough to drill clean in one pass. In brass. -- Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> |
From: jeremy y. <jcy...@gm...> - 2018-06-04 04:05:51
|
> > No Index??? Seems like it would be handy. It appears to have an index slot in the glass plate , but not enough wires π€π€π€ OTOH, for XYZ, not a hard and > fast requirement as long as the home switches are good. I have 5 of those inductive pickups we were talking about a few months back, I think Greg or Chris brought them to our attention , so we will find out. But you'll need > it on the spindle. In fact, the index is the only thing that must be > tied to the spindle if you ever want to do rigid tapping. > I'm gonna put one of thousands cui encoders on it, I left this renco on > the ametek as I'm just plain lazy and figured with the home switches it > wasn't absolutely essential to have index. > Also without this new motor in hand I have no idea how it is equipped , hopefully it already has a nice encoder on it πππ > > The rest of the encoder (a/b signals) can be on the motor, and you can > calibrate the scale for the spindle with some hal stuff you can comment > back out of the hal file once the scale has been determined. Thats how I > did mine anyway. Works a treat. > I'm sure I will have questions for this. > > > Finally, something that didn't fight me tooth and nail. > > > Now I have to put an encoder on the z motor and wait for brown to drop > > this 6hp spindle motor off and see what I need for that, I have 2 > > drives coming for that and a bid on a power supply for the drives so > > life is well at this time. > > Sounds good. How much weight do have to man handle on the Z? > This motor ships at 50 lbs it's a knee mill , however it only has freedom of movement along the x axis , I hope to turn this later with a harmonic drive > > > Ttyl take care fellas > > We try. I've got the tap hat g-code working well, but ran out of M6 grub > screws, so I just ordered another 100 M6's and 100 M8's for the biggest > taps, which should run me out of brass before I run out of taps to > mount. So sometime after the screws get here, I should order another 6 > feet of 7/8" brass rod. And a decent set of letter drills, these are > only slightly better than cold butter. Even running each one thru one of > the original drill doctors isn't enough to drill clean in one pass. In > brass. > > Good to hear you're making progress as well. > -- > Cheers, Gene Heskett > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc...@li... > https://lists.sourceforge.net/lists/listinfo/emc-users > |
From: Todd Z. <to...@pg...> - 2018-06-04 13:42:42
|
I've had a few servo motors who's encoders did not have an index wire, but the encoder had all of the index hardware populated, and simply adding the necessary wire to connect it enabled it. Todd Zuercher P. Graham Dunn Inc. 630 Henry StreetΒ Dalton, Ohio 44618 Phone:Β (330)828-2105ext. 2031 -----Original Message----- From: jeremy youngs [mailto:jcy...@gm...] Sent: Monday, June 04, 2018 12:05 AM To: Enhanced Machine Controller (EMC) <emc...@li...> Subject: Re: [Emc-users] Encoders > > No Index??? Seems like it would be handy. It appears to have an index slot in the glass plate , but not enough wires π€π€π€ OTOH, for XYZ, not a hard and > fast requirement as long as the home switches are good. I have 5 of those inductive pickups we were talking about a few months back, I think Greg or Chris brought them to our attention , so we will find out. But you'll need > it on the spindle. In fact, the index is the only thing that must be > tied to the spindle if you ever want to do rigid tapping. > I'm gonna put one of thousands cui encoders on it, I left this renco > on the ametek as I'm just plain lazy and figured with the home > switches it wasn't absolutely essential to have index. > Also without this new motor in hand I have no idea how it is equipped , hopefully it already has a nice encoder on it πππ > > The rest of the encoder (a/b signals) can be on the motor, and you can > calibrate the scale for the spindle with some hal stuff you can > comment back out of the hal file once the scale has been determined. > Thats how I did mine anyway. Works a treat. > I'm sure I will have questions for this. > > > Finally, something that didn't fight me tooth and nail. > > > Now I have to put an encoder on the z motor and wait for brown to > > drop this 6hp spindle motor off and see what I need for that, I have > > 2 drives coming for that and a bid on a power supply for the drives > > so life is well at this time. > > Sounds good. How much weight do have to man handle on the Z? > This motor ships at 50 lbs it's a knee mill , however it only has freedom of movement along the x axis , I hope to turn this later with a harmonic drive > > > Ttyl take care fellas > > We try. I've got the tap hat g-code working well, but ran out of M6 > grub screws, so I just ordered another 100 M6's and 100 M8's for the > biggest taps, which should run me out of brass before I run out of > taps to mount. So sometime after the screws get here, I should order > another 6 feet of 7/8" brass rod. And a decent set of letter drills, > these are only slightly better than cold butter. Even running each one > thru one of the original drill doctors isn't enough to drill clean in > one pass. In brass. > > Good to hear you're making progress as well. > -- > Cheers, Gene Heskett > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > ---------------------------------------------------------------------- > -------- Check out the vibrant tech community on one of the world's > most engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc...@li... > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc...@li... https://lists.sourceforge.net/lists/listinfo/emc-users |
From: jeremy y. <jcy...@gm...> - 2018-06-16 00:20:40
|
Always another hurdle . Lol. I abandoned the h bridge plan for now as I am lacking sufficient power supply. I have 2 aerotech 4020 linear drives . The issue is they need tachometer feedback and it appears though the drive isn't configured for armature feedback. So the question is, is there a readily available device to convert 1000 ppr to an analog signal @7v /1000 rpm ? The drive is configurable to torque mode, would it be easier to set drive in torque mode and tune servo in Linux CNC with 7i90 ? Thanks |
From: jeremy y. <jcy...@gm...> - 2018-06-16 02:15:48
|
Gmail is queing my messages for some reason. I apologize if this double posts. Always another hurdle . Lol. I abandoned the h bridge plan for now as I am > lacking sufficient power supply. I have 2 aerotech 4020 linear drives . The > issue is they need tachometer feedback and it appears though the drive > isn't configured for armature feedback. So the question is, is there a > readily available device to convert 1000 ppr to an analog signal @7v /1000 > rpm ? > > The drive is configurable to torque mode, would it be easier to set drive > in torque mode and tune servo in Linux CNC with 7i90 ? > Thanks > |
From: Gene H. <ghe...@sh...> - 2018-06-16 02:58:11
|
On Friday 15 June 2018 20:20:20 jeremy youngs wrote: > Always another hurdle . Lol. I abandoned the h bridge plan for now as > I am lacking sufficient power supply. I have 2 aerotech 4020 linear > drives . The issue is they need tachometer feedback and it appears > though the drive isn't configured for armature feedback. So the > question is, is there a readily available device to convert 1000 ppr > to an analog signal @7v /1000 rpm ? > > The drive is configurable to torque mode, would it be easier to set > drive in torque mode and tune servo in Linux CNC with 7i90 ? > Thanks Put a 1000 line encoder on the motor, and use the encoders in the 7i90 to do a position servo. The aerotech drive is line powered, 20 amps max, 40 volts max. And it has inputs for an encoder, taking lcnc out of the circuit if you'd like. But I'd druther put the encoder into linuxcnc, and let it calculate the pwm or pdm drive needed for a position null. I think it would be more precise, and possibly faster. Aerotech mentions using 741's (op-amps) but the gain of a 741 above 10 hz falls like a rock, and that leaves the nyquist phase v stability angles in doubt. I don't see a reason why, if the correct motors are used, that it cannot be made to work. > ---------------------------------------------------------------------- >-------- Check out the vibrant tech community on one of the world's > most engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc...@li... > https://lists.sourceforge.net/lists/listinfo/emc-users -- Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> |
From: Chris A. <alb...@gm...> - 2018-06-16 03:53:23
|
On Fri, Jun 15, 2018 at 7:58 PM Gene Heskett <ghe...@sh...> wrote: > On Friday 15 June 2018 20:20:20 jeremy youngs wrote: > > Aerotech mentions > using 741's (op-amps) but the gain of a 741 above 10 hz falls like a > rock, and that leaves the nyquist phase v stability angles in doubt. If the paper suggests using a 741, then the paper is very old. Today you can of course buy better op amps. And of course today a micro controller can precisely measure an qucoder at any speed from zero up to some MHz. If you can, the simplest way is to connect the digital encoder to the mesa card, let it keep the position count then use that any way you wish, possible to create the analog output you want I would not build an analog, op amp based digital rate the analog output converter even with modern op amps. That is not the best solution in 2018. A digital counter is the way to do. It is easy to make and as exact as you want. But I think the existing FPGA based hardware should be able to count and you'd not need to actually build anything. -- Chris Albertson Redondo Beach, California |
From: Gene H. <ghe...@sh...> - 2018-06-16 08:22:33
|
On Friday 15 June 2018 23:53:03 Chris Albertson wrote: > On Fri, Jun 15, 2018 at 7:58 PM Gene Heskett <ghe...@sh...> wrote: > > On Friday 15 June 2018 20:20:20 jeremy youngs wrote: > > > > Aerotech mentions > > using 741's (op-amps) but the gain of a 741 above 10 hz falls like a > > rock, and that leaves the nyquist phase v stability angles in doubt. > > If the paper suggests using a 741, then the paper is very old. That amazed me too, Chris. I was reading about 1960 technology. That pdf is from aerotech's own site, anybody can download it and read it. Were I to design a similar device today, I'd certainly use lf357's or better. Something with a speed approaching video usage. If I were to pick up some of them used, I'd certainly warm up the iron and change them. And check any electrolytic caps for old age, replacing as necessary. Offtopic sorta: I just went thru a $20 set of computer speakers using one of those $20 banggood parts testers, and replaced 6 of the 11 caps in it, sounds great again. The tester I used is similar to this device but only has one button: <https://www.banggood.com/Transistor-Tester-ESR-Capacitance-Meter-Resistance-Inductance-Measuring-p-1044840.html?rmmds=search> Biggest usage problem is the zif socket, not very sturdy. But it measures ESR, the most important characteristic of a cap after its capacity in u-f. Ontopic: If Jeremy got those used, they are probably takeouts from a 30 yo or older machine, And likely needing repairs as I am discussing to restore the original performance. Even NOS, sitting on the shelf gathering dust all this time, they would be suspect. > Today > you can of course buy better op amps. And of course today a micro > controller can precisely measure an qucoder at any speed from zero up > to some MHz. If you can, the simplest way is to connect the digital > encoder to the mesa card, let it keep the position count then use that > any way you wish, possible to create the analog output you want > By using pdm/pwm in the pwmgens. At 50 kilohertz, then integrating that to get your analog voltage. But no not pass the raw signal thru an opto-isolator, the control linearity will be destroyed. There are no such critters in the 7i90/7i42TA control, but there will be in common BoB's used with the 5i25's and such parport simulators. > I would not build an analog, op amp based digital rate the analog > output converter even with modern op amps. That is not the best > solution in 2018. A digital counter is the way to do. It is easy to > make and as exact as you want. But I think the existing FPGA based > hardware should be able to count and you'd not need to actually build > anything. Indeed. Its all in the .hal code today, no "parts" involved. I think what I would do is hook into the power supply's, disconnecting the old active stuff and use them to feed power to one of the pico systems pwm-servo's per axis controlled. The control bandwidth is fast enough that with a low resolution encoders quantization noise, it rattles the gear lash making you think you need to tear the head down and replace its vfx quality bearings, because it sounds like every ball in them is square. With a 1000 line encoder on the motor, my machine runs at least 30 db quieter. -- Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> |
From: jeremy y. <jcy...@gm...> - 2018-06-16 16:45:57
|
On Sat, Jun 16, 2018, 3:23 AM Gene Heskett <ghe...@sh...> wrote: > On Friday 15 June 2018 23:53:03 Chris Albertson wrote: > > > On Fri, Jun 15, 2018 at 7:58 PM Gene Heskett <ghe...@sh...> > wrote: > > > On Friday 15 June 2018 20:20:20 jeremy youngs wrote: > > > > > > Aerotech mentions > > > using 741's (op-amps) but the gain of a 741 above 10 hz falls like a > > > rock, and that leaves the nyquist phase v stability angles in doubt. > > > > If the paper suggests using a 741, then the paper is very old. > > That amazed me too, Chris. I was reading about 1960 technology. > > That pdf is from aerotech's own site, anybody can download it and read > it. Were I to design a similar device today, I'd certainly use lf357's > If I do this will I have to balance the op amp or is it a simple replacement? And check any electrolytic caps for old age, replacing as > necessary. > > Offtopic sorta: > > > > < > https://www.banggood.com/Transistor-Tester-ESR-Capacitance-Meter-Resistance-Inductance-Measuring-p-1044840.html?rmmds=search > > > > I have one of these and a variable supply for reforming caps, built a few > months ago to resurrect my wife's organ . > > If Jeremy got those used, they are probably takeouts from a 30 yo or > older machine. > 1993, pulled from working environment, I agree the 741 is ancient , and will likely replace them and will test these caps. The power supplies were worth what I gave for the drives. > > If you can, the simplest way is to connect the digital > > encoder to the mesa card, let it keep the position count then use that > > any way you wish, possible to create the analog output you want > I'm hoping to allow the mess card to do this and set torque mode to use the 4020 as a simple amplifier. Thanks for the reassurance this is a good idea. > > > By using pdm/pwm in the pwmgens. At 50 kilohertz, then integrating that > to get your analog voltage. But no not pass the raw signal thru an > opto-isolator, the control linearity will be destroyed. There are no > such critters in the 7i90/7i42TA control, but there will be in common > BoB's used with the 5i25's and such parport simulators. > > > I would not build an analog, op amp based digital rate the analog > > output converter even with modern op amps. That is not the best > > solution in 2018. A digital counter is the way to do. It is easy to > > make and as exact as you want. But I think the existing FPGA based > > hardware should be able to count and you'd not need to actually build > > anything. > > I hope to avoid building. I'm really busy in the auto shop so it will be a > week or two before theory hits action. > Indeed. Its all in the .hal code today, no "parts" involved. I think > what I would do is hook into the power supply's, disconnecting the old > active stuff and use them to feed power to one of the pico systems > pwm-servo's per axis controlled. This is a high probability, as mentioned the power supplies were worth the cost of admission. The control bandwidth is fast enough > that with a low resolution encoder. > The cui encoder is selectable, o have it at 1000 ppr as that's what the optical encoder that still works on the other ametek is at , that and 2.3:1 timing belt drive should give great resolution. I have the work flow to purchase x axis balkscrews in the near future as well. When I get a chance I'm going to get some photos of the recent goodies that have showed up. Thanks for bouncing ideas guys. |
From: jeremy y. <jcy...@gm...> - 2018-06-16 17:00:29
|
A quick Google, digikey and eBay search turned up nothing for an if357 , or an irf 357 . Any other suggestions? |
From: Gene H. <ghe...@sh...> - 2018-06-16 17:54:07
|
On Saturday 16 June 2018 13:00:08 jeremy youngs wrote: > A quick Google, digikey and eBay search turned up nothing for an if357 > , or an irf 357 . Any other suggestions? Did I do a "typu"? Or is lower case confusing the issue. s/b an LF357. Or if you want the most stable, highly tested version, an LF157. Check the whole family, maybe a different member suits you better. Stabilization networks commonly used with those old slow op-amps can be removed as a general rule. > ---------------------------------------------------------------------- >-------- Check out the vibrant tech community on one of the world's > most engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc...@li... > https://lists.sourceforge.net/lists/listinfo/emc-users -- Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> |
From: Eric K. <kel...@gm...> - 2018-06-16 18:22:43
|
he apparently searched for 'if' which isn't going to work On Sat, Jun 16, 2018 at 1:53 PM, Gene Heskett <ghe...@sh...> wrote: > On Saturday 16 June 2018 13:00:08 jeremy youngs wrote: > > > A quick Google, digikey and eBay search turned up nothing for an if357 > > , or an irf 357 . Any other suggestions? > > Did I do a "typu"? Or is lower case confusing the issue. s/b an LF357. Or > if you want the most stable, highly tested version, an LF157. Check the > whole family, maybe a different member suits you better. Stabilization > networks commonly used with those old slow op-amps can be removed as a > general rule. > > > ---------------------------------------------------------------------- > >-------- Check out the vibrant tech community on one of the world's > > most engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > _______________________________________________ > > Emc-users mailing list > > Emc...@li... > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > -- > Cheers, Gene Heskett > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > Genes Web page <http://geneslinuxbox.net:6309/gene> > > ------------------------------------------------------------ > ------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc...@li... > https://lists.sourceforge.net/lists/listinfo/emc-users > |
From: Chris A. <alb...@gm...> - 2018-06-16 18:07:11
|
On Sat, Jun 16, 2018 at 1:23 AM Gene Heskett <ghe...@sh...> wrote: > On Friday 15 June 2018 23:53:03 Chris Albertson wrote: > > > By using pdm/pwm in the pwmgens. At 50 kilohertz, then integrating that > to get your analog voltage. But no not pass the raw signal thru an > opto-isolator, the control linearity will be destroyed. Why is that? Let's assume you have onto-isolater that are fast enough for the signals. It seems that at most they would introduce a delay. I do agree that you don't need an opto-isolator for an optical encoder. -- Chris Albertson Redondo Beach, California |
From: Gene H. <ghe...@sh...> - 2018-06-16 22:49:00
|
On Saturday 16 June 2018 14:06:51 Chris Albertson wrote: > On Sat, Jun 16, 2018 at 1:23 AM Gene Heskett <ghe...@sh...> wrote: > > On Friday 15 June 2018 23:53:03 Chris Albertson wrote: > > > > > > By using pdm/pwm in the pwmgens. At 50 kilohertz, then integrating > > that to get your analog voltage. But no not pass the raw signal thru > > an opto-isolator, the control linearity will be destroyed. > > Why is that? Let's assume you have onto-isolater that are fast enough > for the signals. It seems that at most they would introduce a delay. > Except the on delay is not the same as the off delay. Based on running the pwd at a high enough frequency to get smooth control in the first place. Even a 1 kilohertz pwm is fast enough to demo the effect, and at 1 kilohertz by the time its been smoothed to the analog equ, control bandwidth is in the toilet. Take the opto's out of the circuit, and run the pwm at 50 kilohertz, and you've then got control bandwidth to throw away. At 50 kilohertz, a .01% duty cycle gets you 15 to 20 revs at the motor shaft. With the lag of the opto's added, running at 1 kilohertz, it may take 5% duty cycle just to wake up the motor. Haveing the opto's confusing the issue you don't need. > I do agree that you don't need an opto-isolator for an optical > encoder. That depends on the encoders resolution and how fast its spinning. Take the opto's out, and bingo, linear encoder response to 100 kilohertz or more. With the opto's the signals got lost at 240 rpms at the spindle, and the spindle went wide open. Now I can request 20 rpm in high gear, and I cannot stop the spindle by grabbing it. Burn up my hand maybe. -- Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> |
From: jeremy y. <jcy...@gm...> - 2018-06-16 18:48:48
|
Thank you Gene, eBay item # 302357383187 These correct? If so I will get them coming. On Sat, Jun 16, 2018, 12:54 PM Gene Heskett <ghe...@sh...> wrote: > On Saturday 16 June 2018 13:00:08 jeremy youngs wrote: > > > A quick Google, digikey and eBay search turned up nothing for an if357 > > , or an irf 357 . Any other suggestions? > > Did I do a "typu"? Or is lower case confusing the issue. s/b an LF357. Or > if you want the most stable, highly tested version, an LF157. Check the > whole family, maybe a different member suits you better. Stabilization > networks commonly used with those old slow op-amps can be removed as a > general rule. > > > ---------------------------------------------------------------------- > >-------- Check out the vibrant tech community on one of the world's > > most engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > _______________________________________________ > > Emc-users mailing list > > Emc...@li... > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > -- > Cheers, Gene Heskett > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author) > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc...@li... > https://lists.sourceforge.net/lists/listinfo/emc-users > |
From: Gene H. <ghe...@sh...> - 2018-06-16 22:52:57
|
On Saturday 16 June 2018 14:48:27 jeremy youngs wrote: > Thank you Gene, > eBay item # 302357383187 > These correct? If so I will get them coming. Thats 2 for 11 bucks, for that he ought to cover the postage. But yes, thats the one I had in mind. > On Sat, Jun 16, 2018, 12:54 PM Gene Heskett <ghe...@sh...> wrote: > > On Saturday 16 June 2018 13:00:08 jeremy youngs wrote: > > > A quick Google, digikey and eBay search turned up nothing for an > > > if357 , or an irf 357 . Any other suggestions? > > > > Did I do a "typu"? Or is lower case confusing the issue. s/b an > > LF357. Or if you want the most stable, highly tested version, an > > LF157. Check the whole family, maybe a different member suits you > > better. Stabilization networks commonly used with those old slow > > op-amps can be removed as a general rule. > > > > > ------------------------------------------------------------------ > > >---- -------- Check out the vibrant tech community on one of the > > > world's most engaging tech sites, Slashdot.org! > > > http://sdm.link/slashdot > > > _______________________________________________ > > > Emc-users mailing list > > > Emc...@li... > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > -- > > Cheers, Gene Heskett > > -- > > "There are four boxes to be used in defense of liberty: > > soap, ballot, jury, and ammo. Please use in that order." > > -Ed Howdershelt (Author) > > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > > > > -------------------------------------------------------------------- > >---------- Check out the vibrant tech community on one of the world's > > most engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > _______________________________________________ > > Emc-users mailing list > > Emc...@li... > > https://lists.sourceforge.net/lists/listinfo/emc-users > > ---------------------------------------------------------------------- >-------- Check out the vibrant tech community on one of the world's > most engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc...@li... > https://lists.sourceforge.net/lists/listinfo/emc-users -- Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> |
From: jeremy y. <jcy...@gm...> - 2018-06-16 23:42:37
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On Sat, Jun 16, 2018, 5:53 PM Gene Heskett <ghe...@sh...> wrote: > On Saturday 16 June 2018 14:48:27 jeremy youngs wrote: > > > Thank you Gene, > > eBay item # 302357383187 > > These correct? If so I will get them coming. > > Thats 2 for 11 bucks, for that he ought to cover the postage. But yes, > thats the one I had in mind. > Ordered, thanks for your advice. As to the other subject, generating a tach signal, I think in torque mode and the 7i90 driving it I won't need to worry about it. Now if I could find a user manual for these Western servo design bpu s2 32/30 drives I could cook with oleo!!!! > |
From: Gene H. <ghe...@sh...> - 2018-06-17 00:25:57
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On Saturday 16 June 2018 19:42:14 jeremy youngs wrote: > On Sat, Jun 16, 2018, 5:53 PM Gene Heskett <ghe...@sh...> wrote: > > On Saturday 16 June 2018 14:48:27 jeremy youngs wrote: > > > Thank you Gene, > > > eBay item # 302357383187 > > > These correct? If so I will get them coming. > > > > Thats 2 for 11 bucks, for that he ought to cover the postage. But > > yes, thats the one I had in mind. > > Ordered, thanks for your advice. > > As to the other subject, generating a tach signal, I think in torque > mode and the 7i90 driving it I won't need to worry about it. > > Now if I could find a user manual for these Western servo design bpu > s2 32/30 drives I could cook with oleo!!!! > > Nah, I've been using coconut oil for several years now. It adds a sweeter taste to my pork chops and fried eggs. And its lots healthier. And doesn't run my sugar up either. I'm a DM-II diabetic. > ---------------------------------------------------------------------- >-------- Check out the vibrant tech community on one of the world's > most engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc...@li... > https://lists.sourceforge.net/lists/listinfo/emc-users -- Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> |
From: Chris A. <alb...@gm...> - 2018-06-17 00:54:56
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I followed the link and was shocked at the price. Try Digikey. They are $0.83 and you get them fast as they are a US supplier. Check the data sheet to see if they work for you. On Sat, Jun 16, 2018 at 11:49 AM jeremy youngs <jcy...@gm...> wrote: > Thank you Gene, > eBay item # 302357383187 > These correct? If so I will get them coming. > > On Sat, Jun 16, 2018, 12:54 PM Gene Heskett <ghe...@sh...> wrote: > > > On Saturday 16 June 2018 13:00:08 jeremy youngs wrote: > > > > > A quick Google, digikey and eBay search turned up nothing for an if357 > > > , or an irf 357 . Any other suggestions? > > > > Did I do a "typu"? Or is lower case confusing the issue. s/b an LF357. Or > > if you want the most stable, highly tested version, an LF157. Check the > > whole family, maybe a different member suits you better. Stabilization > > networks commonly used with those old slow op-amps can be removed as a > > general rule. > > > > > ---------------------------------------------------------------------- > > >-------- Check out the vibrant tech community on one of the world's > > > most engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > > _______________________________________________ > > > Emc-users mailing list > > > Emc...@li... > > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > > -- > > Cheers, Gene Heskett > > -- > > "There are four boxes to be used in defense of liberty: > > soap, ballot, jury, and ammo. Please use in that order." > > -Ed Howdershelt (Author) > > Genes Web page <http://geneslinuxbox.net:6309/gene> > > > > > > > ------------------------------------------------------------------------------ > > Check out the vibrant tech community on one of the world's most > > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > _______________________________________________ > > Emc-users mailing list > > Emc...@li... > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc...@li... > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California |
From: jeremy y. <jcy...@gm...> - 2018-06-17 01:40:31
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Gene, it was an inference I knew you would get, all those years working the dairy farm in upstate, I only cook with the real thing. Having lost my grandma,mom and my brother now type 2 I strive really hard to keep lean and sugar low. I gave up sodas, heavy drinking, breads and anything else with unnatural sugars in it. At 42, 6'1 and 175 I hope it helps. I think my heart will wipe me out first, 1 open heart surgery already logged. Heart is great it's the arteries and aortic aneurysm I fear will cause the long , unexpected and hopefully painless sleep. Chris , oddly enough I didn't even check digikey, I just let the eBay rip. I'm getting consternated on this subject. I keep promising photos but in keeping up with the shop traffic and the 86 Chevy restoration and funding all of these neat things I haven't yet found the time. Alas the damage is done. These capacitors are screw mount so if I get the time between backhoe hose and 460 engine removal tomorrow I will post some pics . I am striving for a top performing machine and things keep working out do that should well happen. TTYL thanks guys. |
From: Ormund W. <or...@pa...> - 2008-01-23 21:15:42
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On Sat, 2008-01-19 at 21:51 +0000, Ian Wright wrote: > Hi, > > I have a couple of servo motors out of an old Olivetti printer which I'd > like to try to use, however, I can't find any information about the > encoders fitted to them. The encoders are in flat brown plastic > enclosures on the end of the motors and have 7 pin plugs with 6 wires > connected (the motor power wires are separate). Looking inside there > appears to probably be 3 photo sensing elements and a clear plastic > encoder disk with, I think, 100 prismatic lumps on it and so I assume > that the 6 wires must somehow represent a quadrature encoder with index > mark???? - or maybe a quadrature encoder with two power connections - I > don't know. Has anyone come across this type of motor and worked out the > connections or is there some way I could work it out for myself?? thanks. > I've a simillar motor/encoder, though this motor is not in a printer. So far what I've done is trace out the connection on the PCB that the resolver is connected to, and found which wires were the power and confirmed the voltage is 5v. The next time I have access to the machine I will power up the encoder, attach a 'scope to the other 6 wires, rotate the motor and see if I can decipher the output. I think this unit has differential outputs so a pair of wires for phase A another for phase B and another for the index, for a total of 8 wires. Your best bet is figuring out which wires are the power first, do you still have the circuit the servo was connected to? If not try to get the cover of the encoder and examin the circuit there. If you can take some pictures post them. __ Ormund |