Hello Guest it is July 08, 2020, 01:31:12 AM

Author Topic: Suddenly Goto Zero isn't working right...  (Read 3593 times)

0 Members and 1 Guest are viewing this topic.

Suddenly Goto Zero isn't working right...
« on: December 07, 2010, 12:09:06 PM »
I'm a relatively new Mach3 user (a month or two).  Things have been great! except...

A few days ago, goto zero stopped working correctly.  it drives the Y and Z axis correctly to the zero, but the X axis stepper just "buzzes" and doesn't move.  During actual milling operations all works fine, it's just the go to zero that fails.

Andy ideas??

--marcel

Offline Hood

*
  •  25,846 25,846
  • Carnoustie, Scotland
    • View Profile
Re: Suddenly Goto Zero isn't working right...
« Reply #1 on: December 07, 2010, 02:11:06 PM »
Your motor is stalling, what is causing it could be one of many problems, a few of which could be
Axis is binding
Power supply is failing
Loose connections
Drive or motor failing


You can maybe try swapping drives and motors around to see if you can make the problem follow the component but just do one at a time.

Hood
Re: Suddenly Goto Zero isn't working right...
« Reply #2 on: December 07, 2010, 03:43:46 PM »
I don't think that is the issue,  Like I said, it works fine during any milling operation or manual jog or in the "test" screens. 

The only thing that doesn't work is when I hit the "goto zero" button.

Everything else works fine..

Offline Hood

*
  •  25,846 25,846
  • Carnoustie, Scotland
    • View Profile
Re: Suddenly Goto Zero isn't working right...
« Reply #3 on: December 07, 2010, 03:54:29 PM »
Please attach your xml.
Hood
Re: Suddenly Goto Zero isn't working right...
« Reply #4 on: December 07, 2010, 10:55:14 PM »
Hmm Ok, something weird happened... I attached the file and hit the post button... but my message didn't appear to get posted.  When I tried a second time, it says my attached file already exists..

Forum seems to be acting flakey for me today...
Re: Suddenly Goto Zero isn't working right...
« Reply #5 on: December 08, 2010, 12:10:00 AM »
Trying again.. changing the file name to protect the guilty..

Offline Hood

*
  •  25,846 25,846
  • Carnoustie, Scotland
    • View Profile
Re: Suddenly Goto Zero isn't working right...
« Reply #6 on: December 08, 2010, 04:11:38 AM »
XML looks fine, what happens if you command a rapid move for both X and Y from the MDI line, eg G0X100Y100

Hood
Re: Suddenly Goto Zero isn't working right...
« Reply #7 on: December 08, 2010, 08:45:26 AM »
ok, so that's interesting...

G0X4Y4 (it's a small mill).. The X moves 4", the Y stalls about 1/2 way
G0X4 the x stalls about 1/2 way
G0Y4 the y stalls about 1/2 way

G0X4Y4 (second try) Both axis stalled about 1/2 way.

sometimes I'm lucky and it will succeed, other times I'm not..
I'm beginning to suspect hardware... the computer is rather old..

Offline Hood

*
  •  25,846 25,846
  • Carnoustie, Scotland
    • View Profile
Re: Suddenly Goto Zero isn't working right...
« Reply #8 on: December 08, 2010, 08:54:39 AM »
I dont think its computer, much more likely either accel/Vel settings too high or that you have binding axis or maybe power supply is varying too much. If you have a volt meter check on the DC side of the power supply and see if it varies quite a bit when you command a rapid move.

Hood
Re: Suddenly Goto Zero isn't working right...
« Reply #9 on: December 08, 2010, 10:01:02 PM »
I agree with Hood.   Im a complete newbie though, so it may not be worth much.

Try going into the config drop down.  Then, clicking on motor tuning.   

Then, cut your acceleration in half of what you have listed on each axis  and drop the velocity down to about 2/3 of what its set at now.  Leave the steps alone.

Then, try repeating the problematic action.   If it cures it, your motor settings were too optimistic.   I've read you should set your motors at about 80% of what they are listed.  Ive slowed mine down to about 20% of max because everything is moving faster than I can handle right now (my confidence anyways.)