Harrison M300 cnc

**keith wainwright** · 24-01-2016

Hello long time no see. Been busy . This is the story so far . My Harrison lathe now has 2 new servo motors and drives fitted. Not wired to smoothstepper yet but they do jog on the buttons nice. Got smoothstepper and 2 breakout boards fitted and wired to index disk and all the limits .Just got 1 problem . All the m3 m4 and m5 commands work fine but speed commands are totally ignored and it spins as fast as the invertor will let it go . Got lots of gears but I would like to vary it a little. The volts on the bob's stay at 10 (both bob's) all the time 0 to 10000000 rpm its all the same . Any ideas its driving me nuts.

**komatias** · 25-01-2016

Hi Keith,

I assume you are using a good quality multimeter to measure the 10V voltage. My Maplin specials do not average enough to give a good measurement. They always give a peak measurement.

Have you gone through the spindle calibration so that Mach3 can write the linearity data?

have a look at this one too:

http://www.machsupport.com/forum/ind...c,15457.0.html

**keith wainwright** · 03-05-2016

Hello .I finally got servo motors and all that's required working on my Harrison m 300 . but small problem . The lathe runs great forward and reverse (m3 m4)and stops fine (m5) it displays correct revs and feed per rev ok. Both long traverse and cross slide work fine on the buttons .Problem is if I type Go z200 it only goes to about 48 and stops . It reads 48 ish but wont go to 200 or any size bigger than 100 There's nothing in the way and makes no difference where the zero is. I can jog past no problem . Also it does this in the middle of a program and loses its way it then very quickly runs through the program to the m30 command and all it does is giggle the tool a little . Servo motors work good and are very accurate over small distances . ANY BODY any ideas its driving me mad . Its all running and I want to put the covers on and tidy it up . It runs through a force 9 Ethernet smoothstepper . The computer boots up and installs the plugin no probs. Thanks Forgot to mention when it loses its way or stops in wrong place E stop wont work nor will limit switches . I have to have my finger on the power switch.

**John S** · 03-05-2016

Are you typing G Zero or G small o as you have written it ?

**keith wainwright** · 03-05-2016

G0 From the numbers row . ie 01234 Its what I do at work thanks

**JAZZCNC** · 03-05-2016

keith re-install Mach and try again. It could be Mach's gone tits up.

I had it do crazy thing on me other day in Mill mode. Was just like was stuck in Exact stop mode but it wasn't. Nothing I did made any difference and everything worked fine just machine was jerking it's head off.!! . . . Re-installed mach and away it went.