Re: [CAD_CAM_EDM_DRO] MPG, driving the knee

Another plus of driving the knee, roll out spindle and touch, lock spindle, zero out software. Done.

Ron

Les Newell <lesnewell@...> wrote:

Hi Daniel,

Why not feed the MPG output straight into Mach3?

1. Start with an encoder
2. Attach a hand wheel
3. Connect to Mach3
4. Mach3 controls the motors

This way Mach3 always knows where the machine is. When operating the wheel Mach2 will ensure that you don't exceed the motor's maximum speed or acceleration. If you use a reasonably high resolution encoder (500CPR) then the response is very much like a mechanical handwheel.

Les



Daniel T. Medlin wrote:

>Bob,
>
>I read your comments about the MPG on
>CAD_CAM_EDM_DRO@yahoogroups.com.
>
> Would you give me your recommendations on how you
>would accomplish this task?
>
>I was going to use US Digital components to build a
>MPG system, if I understand everything right, that
>would allow movement of a servomotor.
>
>1. Start with an encoder
>2. Attach a hand wheel
>3. Send the output through an encoder resolution
>divider (EDIVIDE) to allow adjustments in the pulse
>per inch ratio as necessary to make the system
>accurate with movement of the hand wheel.
>4. Send the encoder resolution divider signal through
>a step & direction converter (EPOT).
>5. The output of the EPOT along with the Mach 2 system
>would be connected to the same Gecko.
>6. One hand wheel for each machine axis.
>
>The reason for this is, my son�s boss had a very bad
>stroke. It left his right side very weak. He has been
>a racecar engine builder for 35 years. Many of his
>machines could be converted to CNC, but it would
>impractical to convert others. Converting the others
>to a controlled movement system that could be operated
>with his weak hand would be of great benefit.
>
>Please offer your thoughts on this need.
>
>Daniel T. Medlin
>
>
>
>
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