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Author Topic: Help with weird 4th axis issue!  (Read 1431 times)

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Help with weird 4th axis issue!
« on: February 05, 2015, 09:41:23 PM »
I recently received a Novakon Pulsar (stepper version, uses ESS) and tried to hook up my previous 4" home made 4th axis.

I tuned the 4th in Mach using the steps/unit calibrator in it works perfectly in both directions.

But when I use the jog keys, it only sometimes responds.  Sometimes it only responds in one direction.

And then using the MDI commands it doesn't respond half the time, and doesn't seem to go the proper distance the other half the time.

Meanwhile it always works perfectly using the calibration steps/unit utility.

I don't hear any squealing from the stepper to indicate the accel/velocity is too fast.  When it does work, it's nice and smooth.

I don't think any wires are loose as nothing moves it to change whether or not it works or not.

Any ideas?


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Re: Help with weird 4th axis issue!
« Reply #1 on: February 07, 2015, 03:40:41 AM »
Does the A Axis DRO in Mach work correctly when jogging or MDI'ing?

Help with weird 4th axis issue!
« Reply #2 on: February 07, 2015, 10:59:58 AM »
Well I "think" I have it figured it out and as usual it's operator error.  I was thinking that any A command would be incremental (like an idiot) even though I know x and y coordinates are absolute.  So when it didn't move when I repeatedly typed in A90, that's because it was already at 90deg.  Anyways the MDI commands now work fine, I just type in A + the degrees I want and it goes. 

The jogging with the keyboard still is a bit funky, sometimes it works and sometimes it doesn't?  But now at least I think I can trust the MDI commands and therefore G code.  Now I just have to figure out how to generate 4th axis G code!!