Chris D wrote: Gene,
Your machine sounds like a sweetheart! Mine is a chinese 9x20 torn down, ball screws added etc. I do have a VFD running a decent motor on it so it does have enough power. Accuracy on it isn't too bad either when it is behaving!
In your configuration, you are relying on the RPI3 for the real-time pulses correct?
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No, thats the job of the 7i90HD which has a bunch of "canned" functions in it. 72 i/o's altogether. So I still have a bunch of empty terminals.
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Also, if I understand correctly, you are using 2 MPGs as handwheels to be able to run it like a manual lathe. How is the response with the MPGs?
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As long as the jog thread time is 100hz or more, effectively it is instant. codewize, the machine corrects any positioning errors at .001 second intervals.
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Is there a lot of lag time between click and movement or is it fluid?
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very fluid in a hacksaw blade way due to the use of steppers. I can control the size of the jog/click to as little as .0001"
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Does the motion continue to run on after you stop spinning the MPG?
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thats a choice you can configure for when setting the jog mode in the hal file. You can either have it run until its caught up with your cranking, or you can have it stop when the dial stops, throwing away whats left. The dials, at a max jog of 20 thou/click, can outrun the machine as the z speed max is about 50 ipm, while the x speed is about 27 ipm.
Both could stand higher voltage to improve the speed, but its faster than it will ever be cutting unless cutting big coarse threads.
Chris
