i am in the process of finishing a total refit of a 1983 denford orac cnc lathe , all the electronics ,stepper motors & main spindle motor have been replaced with new upto date items .
everything has gone fairly easy until recently when i am trying to set up the spindle & i can't get anything to work properly.if i am in manual mode & using the mdi line put in m3 s500
what i get will something like
S true = 1750 rpm
s box = 500 rpm
but the spindle speed using a hand held tacho = 800 rpm
i have tried the spindle calibration screen , it starts the spindle at 250 rpm & stops at this 30 mins so i stop it because it is going knowwere
everything else is working fine , stepper motors , homing switch's
machine spec
parallel port board , 2 stepper drive boards , spindle board (step & direction converted to 0 to 12v for inverter control ) all these items came from
www.diycnc.co.uk these are the system 4 system on his website , the spindle inverter is an imo idrive - idx 1hp , the motor is a dual voltage 3 phase 3/4 hp 1370 rpm , it has a cnc4pc c3 index pulse board settings are active = low
output = ttl
the spindle index disc has 4 slots with the largest being 12mm wide
i have spent the last 2 days changing settings & try again still no joy
please has anybody any ideas as to what i am doing wrong or something i am overlooking
i am enclosing my xml for you to have a look at to hopefully see my problem
robert