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General Mach Discussion / Canlnot synchronize spindle RPM in Mach3 to actual

« on: August 15, 2015, 04:31:22 PM »

 
I just can't seem to synchronize the rpm of the spindle in mach3
I have a spindle tach (simple hall effect sensor circuit) setup correctly as it reads the spindle fairly accurately.
checked it with a laser tach
I have a CNC4PC C6 board working great as it varies the speeds as it's supposed to


tried everything i could;
form the values in the motor tuning

have some settings in the motor tuning that makes the RPM match accurately at top speed.
half way down it is off about 25%

at the lowest speed it is off 70%

Max RPM 3600 (after warm up)
half speed 1800 rpm set .... actual is 1325 rpm
1000 rpm set ..... actual is 300 rpm

so far this is the best i could get it set to.

any help is greatly appreciated
thanks

PS> please don't suggest the "Calibrate Spindle" ...... doesn't work at all for me.
It messes things up each time. I actually have to delete the "Linearity.dat" file each time to reset it to normal.