Qtdragon for lathe??

I'll post it as soon as I can. 
After posting the files I changed the .ini settings:  OUTPUT_SCALE =value to 1000 and it partially solved the issue.  My Spindle output  range is now 0-10V for forward rotation.  However, this seems not to be an absolute value.  There are various other posts that use completely different values that work for them.  I haven't been able to find the parameters than influence the required value of OUTPUT_SCALE.  It is pure coincidence that I stumbled upon this solution.  It only works for forward rotation but not for reverse rotation. I would however like to rotate the spindle both ways.

[SPINDLE_0]
P = 0.0
I = 0.0
D = 0.0
FF0 = 1.0
FF1 = 0.0
FF2 = 0.0
BIAS = 0.0
DEADBAND = 0.0
MAX_OUTPUT = 2000.0
ENCODER_SCALE = -400.0
 OUTPUT_SCALE = 1000
 OUTPUT_MIN_LIMIT = 10
 OUTPUT_MAX_LIMIT = 2000

Hopefully this helps with the settings.
If you use 0-10 volt input then you can only have positive voltage output.

using +5 and -5 volt input:
output scale defines what value will give full voltage output (+-2000 RPM = full voltage +-5 volts)
output min limit defines lowest value allowed (-2000 or negative full voltage)
output max limit defines highest value allowed (2000 or positive full voltage)
The spindle speed command range would be -2000 to 2000 RPM with output swing from -5 to 5 volts

using +5 and -5 volt input:
output scale defines what value will give full voltage output (+-4000 RPM = lets say 5 volts)
output min limit defines lowest value allowed (-2000 or -2.5 volts )
output max limit defines highest value allowed (2000 or 2.5 volts)
The spindle speed command range would be -2000 to 2000 RPM with output swing from -2.5 to 2.5 volts

output scale defines what value will give full voltage output (+-2000 RPM = full voltage +-5 volts)
output min limit defines lowest value allowed (-2000 or negative full voltage)
output max limit defines highest value allowed (2000 or positive full voltage)
The spindle speed command range would be -2000 to 2000 RPM with output swing from -5 to 5 volts

With 0 to 10 volt input
output scale defines what value will give full voltage output (+4000 RPM = 10 volts)
output min limit defines lowest value allowed (0 or 0 volts can't supply negative voltage)
output max limit defines highest value allowed (4000 or 10 volts)
The spindle speed command range would be 0 to 4000 RPM with output swing from 0 to 10 volts
You would need a reversing relay to run in reverse.


There can be other reasons the spindle does not run at low speeds such as VFD settings of minimium rpm etc.