Dyna Mite 2400 Drill Problem / Repair?

I have a Dyna Mite 2400 drill with cnc control, etc. All of a sudden a few weeks ago, a strange problem started. I drill holes in small circles (like watch bezels) in various radii, sizes, # of holes etc. All of a sudden as the machine is going around in its program, it goes off track. like it will be making a circle and then jump to the left and continue the circle. When we turn the machine on the Y-axis is for example .0355, then turn it off and on again and its .0415 then off and on again and its .0315, etc. The X and Z axii are staying the same. IT seems as if the Y-axis backlash is changing between runs, and sometimes DURING the run. The machine, when it initializes, measures the backlash and compensates for it, and between runs, or during one, when the backlash changes, the machine is not changing its compensation, but rather compensating for the original # (which is now wrong), etc. Has anyone run into a similar problem and had it fixed?

Reply to
Ratedr
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Ratedr , not knowing which version (vintage) your machine is, inspect the stepper gear drive. The nylon gear may have cracked or something there is loose, broken, slipping. This is a known weak area on these. RichD

Ratedr wrote:

Reply to
RichD

That's one possibility, the broken plastic gear. Another, ours began to mis-step. I removed the cover from the control cabinet, and pointed a fan in there to stir thing up a bit. It orked -more- reliably, but not right. I am collecting hardware to retrofit a new control system right now. Total cost under $1000, including pc breakout board, new amps and new motors.

Reply to
Jon

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