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Author Topic: Y-Axis not changing directions: Weird behavior  (Read 1239 times)

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Y-Axis not changing directions: Weird behavior
« on: January 07, 2016, 01:01:45 AM »
Hi All,

Yesterday and today I experienced some weird behavior on my HF mildrill cnc conversion.  I have been up and running for at least 6 months and all seemed well.  Today I was machining aluminum using the TAB key on screen pendant to move the x-y-x axis manually.  I was able to move all the axis in each direction but then my Y-Axis began to act funny.  When I told it to move in the +y direction it actually started to move in the -y direction.  If I told it to move in the -y it would move in the -y direction.  
I shut down Mach3 and it seemed to work OK then it happend again.  I rebooted my computer and shut down my machine controller and it worked again.  I am not sure what fixed it but it was working correctly.  I kept my eye on it and I had it moving in the +y direction and then I actually say it decide to change direction on its own. Just like that the motor changed directions.

I tried rehoming my axis and shutting down Mach3 and rebooting, ect but it did not correct the problem. ??? I did not change any configurations and I have only tried it manually.  I have not run a program but I use it alot just manually. I am using Gekko drivers and Keling stepper motors. Has anyone experienced something similar?  What can I change or do to trouble shoot this issue. Like I said before, my machine was working fine for a long time with out issues I am confused why know?
thanks,
skipper
Re: Y-Axis not changing directions: Weird behavior
« Reply #1 on: January 07, 2016, 07:26:30 AM »
Look closely for an intermittent connection at all of the Y DIR signal terminations.

MDI a long slow Y+ move and gently wiggle the suspect wires and see if the axis reverses.
Then do the same with Y-.
Sounds like a loose connection or bad conductor.

Check the port cable too, if using one.
« Last Edit: January 07, 2016, 07:28:40 AM by Overloaded »