Topics

1

General Mach Discussion / No reverse on homing y

« on: February 19, 2008, 12:53:38 PM »

My machine has taken to erratic behaviour when homing all axis. z and x ok but sometimes y will back off  the limit switch as it should and other times just stops when it hits the switch and gives  an error message. Where is the routine that controls thiis? Can it be corrected iby an edit  or is it a corruption further back? Thanks, Ralph

2

General Mach Discussion / frustrated new guy

« on: January 30, 2008, 07:17:46 PM »

sure could use some help getting the steppers to do something besides lock up. here is the set up:

3 axis router w/ steppers
Mach 3 mill
Mdfly driver board
xp pro on dell 3.3V desktop
CNC 4u breakout C10 Rev 8.3/+5V from USB

Steppers will not run
Output on step pin (y=p4 for instance) when up arrow pushed and dro showing countup. Scope trace shows that signal (normally high,ether 3.3 coming
from port or 5 out of breakout board) low going pulses dropping 1v or less from high rail, not enough, certainly to trigger opto isolators on drive board.

I have uninstalled, including driver, Mach and reloaded. I have installed a second port and reconfigured.  Must be something to do with signal generation.


Why are the pulses not going rail to rail?

Thanks, Ralph Trimnell