Joint following error

wwr
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05 Apr 2011 11:51 #8552 by wwr

Joint following error was created by wwr

Hi!

I'm using emc with a motenc card, and a 3axis milling machine.
Recently I updated to the latest version. Sience then the machine runs for 1 or 2 minutes then one of the coordinates suddenly jump to a random number (about 300000 mm) The machine stops with a joint following error.
This happens even if i don't move the machine.

There were no hardware changes, I installed the system from a live CD.

I have no idea what to do.

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BigJohnT
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05 Apr 2011 12:19 #8555 by BigJohnT

Replied by BigJohnT on topic Re:Joint following error

What version number of EMC are you running?

A quick google of motenc shows it might be a servo system.

I suspect an encoder problem.

Is it always the same axis?

John

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andypugh
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05 Apr 2011 12:20 #8556 by andypugh

Replied by andypugh on topic Re:Joint following error

wwr wrote:

Sience then the machine runs for 1 or 2 minutes then one of the coordinates suddenly jump to a random number (about 300000 mm) The machine stops with a joint following error.

It's good that it stops, but bad that it happens, I suppose.

What version of EMC2 were you using before? (We can look to see if there have been any changes to the Motenc driver).

Is this a servo or stepper machine? What is the feedback from the mill to the PC?

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wwr
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05 Apr 2011 13:23 #8562 by wwr

Replied by wwr on topic Re:Joint following error

I'm using V2.4.3 now. The old system was V2.3.0.

Yes, its a servo system. The error shows usually on the Z axis, but not always.

There are encoders with index signals but i dont use the indexing.

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BigJohnT
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05 Apr 2011 13:41 #8564 by BigJohnT

Replied by BigJohnT on topic Re:Joint following error

Can I assume you followed the instructions here for upgrading from 2.3.x to 2.4.x?

wiki.linuxcnc.org/cgi-bin/emcinfo.pl?UPDATING

Also I would update to the latest version 2.4.6 if possible.

John

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wwr
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05 Apr 2011 14:34 #8569 by wwr

Replied by wwr on topic Re:Joint following error

I checked the documentation before updating.
I installed it on a new harddrive from the live CD.
I have the old config on the old HDD just in case.

I'll try to update to the latest version tomorrow.

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BigJohnT
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05 Apr 2011 14:39 #8571 by BigJohnT

Replied by BigJohnT on topic Re:Joint following error

Did you create a new config or use the old one from 2.3.x?

John

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wwr
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05 Apr 2011 15:01 #8575 by wwr

Replied by wwr on topic Re:Joint following error

I made a copy of the sample config in the new system, and modified it according to the old config and the requirements in the documentation.

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BigJohnT
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05 Apr 2011 15:04 #8576 by BigJohnT

Replied by BigJohnT on topic Re:Joint following error

Ok, just making sure we covered all the bases as far as the software is concerned. So it does seem like some mechanical or electrical issue that has crept in...

John

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wwr
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05 Apr 2011 15:11 #8578 by wwr

Replied by wwr on topic Re:Joint following error

Yes, that is what i'm afraid of too.

The interesting thing is that there were no changes in the hardware, except the HDD.
I'll put the old drive back tomorrow to make sure if its a HW or SW problem.

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