spindle speed reads (-)

[fuzzbuzzuk]

I have recently set up my old denford orac lathe with mach3. All seems well apart from spindle speed. when the spindle starts up it reads it as a - figure. ie if i input m03s1000 in the mdi page it says the speed is -1000rpm. Ive changed debound settings and tried active low/high. Ive set up the spindle pulley to min 200 max 2100. I'm mega lost on this. anyone got any idea's??

[RICH]

There was a problem with computer cpu's with a fast bus speed >2.1 Ghx which would cause the negative  spindle speed in the DRO.
That was fixed and you need to use version 3.042.33 and later.

RICH

[fuzzbuzzuk]

ah yes i have updated mach to a newer version and it now reads the spindle speed.. but the problem i have now is it seems to read the spindle speed to fast and will not calibrate

[angel tech]

are your speed readings low, or only go up to a certain speed

[fuzzbuzzuk]

No... for example. if i input m03 s1000. it will read the speed at 2500rpm.

[angel tech]

and the spindle is running at 1000 not 2500

[fuzzbuzzuk]

yep.. my lathe has a max spinlde speed of 2000rpm so i am quite sure its not doing that speed

[angel tech]

check the index debounce in port and pins/general config, and set it to 0.

[fuzzbuzzuk]

yea i have been playing about with that. also the spindle pully ratio. ive set it at 0.7. I got this number from the max spindle speed of 2000rpm and max motor speed of 1400rpm. so 2000/1400= 0.7 am i right in doing it that way? seems to of helped a little bit.

[fuzzbuzzuk]

i ment 1400/2000=0.7