On Fri, 6 Jun 2008, Jon Elson wrote:
> Date: Fri, 06 Jun 2008 11:11:07 -0500
> From: Jon Elson <[EMAIL PROTECTED]>
> Reply-To: "Enhanced Machine Controller (EMC)"
> <emc-users@lists.sourceforge.net>
> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
> Subject: Re: [Emc-users] PWM Amp Basics
>
> Kirk Wallace wrote:
>> On Thu, 2008-06-05 at 21:19 -0500, Jon Elson wrote:
>> ...snip
>>
>>> If you have a spindle encoder, you could make HAL read the encoder
>>> velocity and add a correction to the PWM output.
>>>
>>> Jon
>>
>>
>> It was talked about before, but I don't remember the outcome. The
>> software encoder has a velocity output pin, but ppmc and other hardware
>> drivers don't?
>>
> The PPMC driver does have "delta", which is velocity in encoder
> count units. For a spindle, I guess it would be scaled from 0.0
> to 1.0, but my driver doesn't do this. It could be added fairly
> easily. There might be glitches in delta when the spindle syncs
> to the index pulse. Clamping the value of delta to some
> reasonable maximum for the RPM and pulse count would be a good
> thing to do. I'll have to do some experiments with this, I am
> going to be setting up a spindle speed control to demo at the
> CNC Workshop.
>
> Jon
>
A reasonable hack might be to use the previous delta for velocity if index
(and a count clear event) happened
Peter Wallace
Mesa Electronics
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