Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: i_r_machinist on March 03, 2012, 05:08:41 PM

Title: 4th axis strange development/ jerky movements
Post by: i_r_machinist on March 03, 2012, 05:08:41 PM

Machine has been and running great with 4th axis. Turned it on today and I get incremental movement on the a (4th) axis. I give it a a command and the rotary head doesn't have a fluid movement to that position, just a jerky move a couple of degrees, dead stop, repeat until A position reached. Even in G1. I don't remember changing any parameters.
Any Help?
i_r_

Title: Re: 4th axis strange development/ jerky movements
Post by: Hood on March 03, 2012, 05:27:51 PM

If you attach your xml I will look see if there is a problem with it. Do the DROs show the jerky movement?
Hood

Title: Re: 4th axis strange development/ jerky movements
Post by: i_r_machinist on March 03, 2012, 05:38:59 PM

Yes,
The control seems to be sending out pulses of movements. I can manually move the a axis and it is as smooth as butter. This just started. Do I just search for a .xml file?
thanks
Kerry

Title: Re: 4th axis strange development/ jerky movements
Post by: Hood on March 03, 2012, 05:40:34 PM

Open Mach and look lower right for the name of the profile you are using then look in the mach folder for a file of that name with an xml extension.
Hood

Title: Re: 4th axis strange development/ jerky movements
Post by: i_r_machinist on March 03, 2012, 05:52:01 PM

Lets see if this works.

Title: Re: 4th axis strange development/ jerky movements
Post by: Hood on March 03, 2012, 05:57:24 PM

Try setting your kernel to 25KHz and restart Mach and see if that helps.
Hood

Title: Re: 4th axis strange development/ jerky movements
Post by: i_r_machinist on March 05, 2012, 09:03:15 AM

Thanks Hood!
That did it.
have fun
i_r_