Re: [Emc-users] SuperPID with EMC?

[Edward B. <yan...@ya...>]

I have an Hitachi M12VC 
http://www.google.com/products/catalog?q=HITACHI+ROUTER&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a&um=1&ie=UTF-8&tbm=shop&cid=4659105001687453144&sa=X&ei=_loBTsq9EIXl0QG9q5XQDg&ved=0CDwQ8gIwAA
 router I'm very pleased with. It's very quiet, light, and inexpensive  and best 
of all has a closed loop speed control that maintains torque  all through its 
range. I have thought about replacing the potentiometer  with an interface to 
EMC2 and would love to hear any ideas to accomplish  this. My first thought was 
to use an Arduino board to accept a PWM  signal and control a digital pot. Any 
better (simpler) ideas? 






________________________________
From: Kent A. Reed <kn...@er...>
To: Enhanced Machine Controller (EMC) <emc...@li...>
Sent: Tue, June 21, 2011 8:01:11 PM
Subject: Re: [Emc-users] SuperPID with EMC?

On 6/21/2011 8:22 PM, Peter Loron wrote:
> On 06/10/2011 04:21 PM, andy pugh wrote:
>> On 10 June 2011 23:53, Jack Coats<ja...@co...>   wrote:
>>>    They seem to support MACH3, but not apparently EMC2 (or at least not
>>> documented well).
>> It has a PWM input, so EMC2 control would be trivial.
>>
>> However, it is rather expensive, and duplicates on-board a number of
>> things that EMC2 would do for free. I have closed-loop PID control on
>> my milling machine using built-in EMC2 functions and a PWM output from
>> EMC2 to the motor drive.
>>
>> You should be able to use something like
>>http://grizzly.amazonwebstore.com/Grizzly-G3555-Router-Speed-Control-20/M/B0000DD1R4.htm?traffic_src=GB&utm_medium=CSE&utm_source=GB&id=uk
>>k
>> (Mainly as a cheap source of pre-assembled parts) with EMC2 PWM and a
>> very simple interface circuit taking the place of the potentiometer.
>>
> I noted a very similar looking controller at Harbor Frieght for $19. Has
> anybody hacked on one of these to drive the pot from EMC?
>
> Once I finish getting my mill basically operational, a router speed
> controller is next on my list. For now, of course, I could just rig up
> some sort of tach and twiddle the pot by hand to the the desired speed,
> but...
>
> -Pete
Pete:

I've purchased several similar controllers from different sources for 
use with routers and the like. Some of the controllers worked very well; 
some weren't worth the cardboard box they came in. Honestly, I couldn't 
predict from their external form, fit, and finish which would be 
acceptable. Certainly, their retail prices didn't correlate with their 
performance. I guess it depends on which offshore contract-factory makes it.

I've not had one from HF. At the price it is probably worth trying it 
but based on my experience I'd strongly urge you to test it before 
bothering to hack it.

Good hunting.

Regards,
Kent




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