Re: [Emc-developers] switching an output at a gcode S speed

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it's more for Mills than Lathes Gene, but the usual time it takes to change
a tool in a toolchanger , then have to
re measure because of a broken bit , half way through a job , especialy
those pcb mills !

the number of times iv'e been asked for it , i think it will be worth doing
mostly for commercial than hobbyist use , i must admit
toolchanging is one thing linuxcnc is lacking , remap is one approach , but
unfortunatley it is missing some crucial area's

On 11 September 2014 16:25, Gene Heskett <ghe...@wd...> wrote:

> On Thursday 11 September 2014 09:56:56 David Armstrong did opine
> And Gene did reply:
> > yea sure Gene
> > ridgid tappng is next on the list
> > and auto tool measuing with toolchanger interface
> > so it knows when a tool is replaced in the toolchanger to re-measure
> > and update tooltable
>
> Humm, I was automatically thinking a lathe because that is where I have
> done that, but now I think I detect that its a milling machine?
>
> > problem i have is changing from machine to running gcode and storing
> > positional info
> > so it can store position , then go and do the tool remeasuring and
> > update , thats where it gets screwed ! haha
>
> Ahh soo....
>
> If you come up with a method to do that for a lathe, whose centerline has
> no electrical contact to allow probing, I think there would be hundreds of
> us interested in a solution to that problem.  For a mill, I cannot
> envision an automatic or gcode driven method of measuring a tool for too
> much more than its projected length.  I do have some code that can place
> it in the length within a thou, using it for etching & drilling PCB's, and
> I can auto center in a hole within that same thou which is sufficient for
> PCB work, making holes drilled halfway thru the PCB meet precisely in the
> middle of the PCB's thickness, but measuring an odd shaped tool has not
> been something I have attempted with the G38.2 function.  It would seem
> that each tool would need its own calibration jig to match its shape.  But
> then how does one calibrate the jig?  Chicken v egg...
>
> For the lathe centerline, I have considered making a laser pointer holder,
> but I wouldn't think the spindle bore is precise enough to suffice as a
> reference so one could just plug the whole thing into the rear of the
> spindle and advance the bit to block half the laser as read by a p-cell in
> the tailstock.  On my 7x12 toy, that bore is fairly roughly machined.
>
> More luck perhaps with a fixed mount, looking thru the center of the
> spindle but I'm in love with the rotation as a method to detect
> eccentricity in the beam.  And all of that would be slower than making and
> measuring a test cut.
>
> > On 11 September 2014 12:42, Gene Heskett <ghe...@wd...> wrote:
> > > On Thursday 11 September 2014 07:09:16 David Armstrong did opine
> > >
> > > And Gene did reply:
> > > > ok Guy's this has me at the moment
> > > >
> > > > i wish to switch a relay at a low speed set by the running gcode S
> > > > value ? ( say 500 rpm)
> > > > i had briefly thrown it at Andy via email and one of his
> > > > suggestions was remaping
> > > > i had a look at the wiki and the spinde remaping is TBD
> > > >
> > > > i had thought of monitoring the encoder or motion , but checking
> > > > for a speed , or if speed
> > > > etc , i can't see any particular similar code or idea
> > > >
> > > > has anyone done anything similar
> > > > i'd prefer to keep it in the hal if possible rather than remap ,
> > > > but if thats a way then fine
> > >
> > > In one of my lathe configs, all hal software, not 5i25, I have a
> > > couple instances of wcomp, one of which is watching the encoder
> > > velocity output, to run the staging of a pair of relays that control
> > > the loading for dynamic braking.  I also have in that config, the
> > > ability to synthesize a stop signal for the turnaround stop when an
> > > m3/m4 or vice versa is done by the planner while running the G33.1
> > > rigid tapping cycle.  They do not detect the stopped condition, I
> > > used a one shot watching an encoder A phase for that.  Complex
> > > indeed, but it worked well enough that I used it to peck tap several
> > > holes with it on a pure parport & cnc4pc BOB only setup.
> > >
> > > If you are interested in looking at my idiocy, David, I can PM it.
> > > Well organized its not.
> > >
> > > 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>
> > > US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS
> > >
> > >
> > > ---------------------------------------------------------------------
> > > --------- Want excitement?
> > > Manually upgrade your production database.
> > > When you want reliability, choose Perforce
> > > Perforce version control. Predictably reliable.
> > >
> > > http://pubads.g.doubleclick.net/gampad/clk?id=157508191&iu=/4140/ostg
> > > .clktrk _______________________________________________
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> > > Emc...@li...
> > > https://lists.sourceforge.net/lists/listinfo/emc-developers
> >
> > -----------------------------------------------------------------------
> > ------- Want excitement?
> > Manually upgrade your production database.
> > When you want reliability, choose Perforce
> > Perforce version control. Predictably reliable.
> > http://pubads.g.doubleclick.net/gampad/clk?id=157508191&iu=/4140/ostg.c
> > lktrk _______________________________________________
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>
>
> 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>
> US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS
>
>
> ------------------------------------------------------------------------------
> Want excitement?
> Manually upgrade your production database.
> When you want reliability, choose Perforce
> Perforce version control. Predictably reliable.
>
> http://pubads.g.doubleclick.net/gampad/clk?id=157508191&iu=/4140/ostg.clktrk
> _______________________________________________
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