faulting out....help....please help

[southbendlathe]

well i inhareted a sherline 5400 cnc mill and desk cnc from a friend who is fed up with it.......and i agree, what a pile of junk.......but maybey you guys can help me...

last nite i crashed it, had it running great for the last 2 1/2 weeks, then i over travled the y axis.......

today, the bloody thing faults out right after i start up a program, at first i thought it was the bob cad program i imported, so i uninstalled every thing, desk, bob cad every thing.....then i reinstalled just desk, same resault......machine jogs ok, then right after i hit go the z axis moves down the amount of - feed, and every thing stops, it dosent rapid down it feeds down the amount of z i told it to deep in to the work, then the controlar says its moving, but nothing, the sarvos go " limp" i.e. i can rotate the machine handles when its running......i did get one program to run for a min, then i stopped....

we have fought evey dumb problem from the get go, from bad service with im, to them building a junk control box.....

i dont know what to do..

machine specs are:
5400 sheline , sarvo cnc retro fit by im serv
globe motors
voltage 30.0

my set up specs are:
machine volocties :
accelerations 11500000
accel scale 18
max velocity 75000
statr velocity 7500

axes set up:

steps per in 112914.00
max vel (sps) 75000


does this help???

please some one...any one.......

[awerby]

Stepper motors are perfectly content to come to rest against an immovable object; servos just keep trying harder until they die (or kill something upstream).

Try switching the leads from the Y axis (although technically that should be called X or Z on a lathe) to the other axis and see if the fault follows along. (Turn everything off first, and let the capacitors drain a bit). If it does, then you've probably fried the driver. If not, you likely killed the motor.

Andrew Werby
www.computersculpture.com

[southbendlathe]

the power leads? the encoder leads? switch both? and what u call a driver, the board in the controlor?? because we just had these tested early this year......im told us they were just fine.........