Hello All,
This is happening on both my X3 mill, and 7x14 Lathe that are CNC. They are both hooked to the same computer, So only one runs at a time.
Simply when an Axis makes a full speed rapid, the displayed speed in mach 3 jumps up to around 6-8k plus. No matter what the current spindle speed is set at. Then returns to normal once the rapid is done.
Details.
Mill - Using an adjustable opto reflector sensor looking at a sanded and black line on the spindle pulley. Happens on any axis rapid movement.
Lathe - Using an opto interrupter style sensor looking at a missing tooth type wheel for its pulse. Happens only on the X axis.
The mill and lathe are on different parallel ports. Mill - On the mother board, Lathe - PCI board.
I am using shielded cable on all the sensors.
The pull up voltage is being supplied from the PC via USB for 5v.
My motor drives are enclosed separately using a xylotec 4 axis box for the mill, and probotix side step drivers for the lathe. Both use a common 24v supply.
Index De-bounce Lathe - 20 Mill - 10 I have tried all the way up to 50 on both with no change.
The mill spindle is speed controlled via cnc4pc's C6 - Variable Speed Control Board normally. I tested this with just manual control hooked up no change.
Notes,
I am using the most recent version of Mach 3. (Just downloaded and installed before coming here. )
Spindle Speed Averaging is turned on.
This has not been an issue that has affected anything I have done until now, but doing more threading work on my lathe, sometimes mid macro it will randomly change its Feed/rev rate. Consistent to the run, but no pattern as far as I can tell. Per example, two runs of 7/8 32tpi. The code did not change, just hit start again.
27 passes 3 spring passes
Run 1 results.
Pass 1-10 - Feed Ok @ .03 in/rev
Pass 11 - Feed changed to .06
Pass 12-14 - Feed .03
Pass 15 - Feed .06
Pass 16-30 - Feed .03
Run 2 Results
Pass 1-7 - Feed Ok @ .03 in/rev
Pass 8 - Feed changed to .02
Pass 9-20 - Feed .03
Pass 21 - Feed .02
Pass 21-24 - Feed .03
Pass 24 - Feed .02
Pass 25-30 - Feed .03
Any help, advice, suggestions or ideas would be greatly appreciated.
Thank you for your time,
TJ
Edit : Note the Turn Diagnostics plugin does not seem to show this as a variation.