On Fri, 25 Jul 2008, Jon Elson wrote:
> Date: Fri, 25 Jul 2008 01:13:21 -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] Feedback on MPG/Jog
>
> Kirk Wallace wrote:
>> Has anyone done a jog wheel with force feed-back for detents and/or axis
>> load? It would be nice to have a jog wheel or quill lever to do "manual"
>> drilling or cutting. Do any of the current commercial CNC's have this?
>>
>> Jon, is there any test point to get a load signal from your PWM amps?
>>
> I can see another problem with this. Your MPG will start
> spinning on its own when the machine is running, unless you kill
> the force feedback unless the MPG is in control of the machine.
> It still makes me think it might runaway when you take your hand
> off the dial.
>
> Jon
>
With the proper HAL magic it may be possible to use a small servo motor (say
one of those Pittman 19V plotter motors) for the jogwheel, but drive it with a
signal that is just the inverted sign of the jogwheels velocity (+1,0 or -1)
multiplied by the spindle load, That way it will not turn on its own, but
resists motion with a force proportional to the spindle load.
(I have done this with our motion controller but not tried it with HAL)
You could also generate the detents with some funny sin(EncoderCount x N)
term
Peter Wallace
Mesa Electronics
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