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1

Third party software and hardware support forums. / suddenly will not stop stepping

« on: October 23, 2015, 04:46:32 PM »

I know similar things have been posted and resolved but I can't seem to get any of the solutions to work.

My very much home made three axis router has been running fine; I cut a three hour job on it last week running mach3 via parallel port no problem. But then yesterday it started stepping the y axis any time that it's enabled. The stepping is not smooth it's like there's 50hz interference on the step pin or something. So I switched the last few cables on the machine over to shielded ones and no change. I soldered on a new driver chip for that axis and no change. I hooked up a scope to the incomming signals for parallel port and I can't see steps coming through.

Pulling my hair out here can't figure out how it's happening.

Interestingly if I have the pc off and pull the enable pins up then all the motors are engaged but static not randomly stepping.

Weird that something like this just started happening half way through a job running.

Any help much appreciated, thanks

2

General Mach Discussion / Dirty jittery movement on one axis

« on: November 09, 2013, 11:31:26 AM »

Afternoon All,

I wonder if anybody could help me with an issue I'm having setting up my new DIY CNC?

After about a year of this project being on the backburner I finally got around to finishing it; it's your basic 3 axis diy cnc setup with a high speed router and a parallel port interface. I have six 8 wire steppers (two per axis) connected to a board which has four outputs per axis (wired for torque rather than speed).

So, to the problem, once I got everything hooked up and configured in mach3 is that two axis run smooth as butter and the third is jumpy, weak and very noisy!

I did a fair but of goggling before posting here so these are the steps I have taken so far:

Slow the axis right down and other motor tuning; still just as bad.
Swap to motors over to eliminate a motor / wiring issue; whichever axis I hook up to this output has the same problem.
Reflow soldering on the section of the board related to this axis. Some joints looked a bit dry and a few needed a little extra solder; but no improvement.
Reflow the whole board right from the ports to the outputs; no improvement.

Any advice much appreciated.

Thanks, Alex