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Author Topic: Help with 4th axis  (Read 6267 times)

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Offline Greolt

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Re: Help with 4th axis
« Reply #10 on: August 07, 2010, 07:06:04 PM »
Astroguy

Could be a lot of things but here is a couple I can think of.

Are you using another profile with the rotary axis?  If so are they exactly the same settigs for the Z axis? Including the pulse lenght? 

Are the step and direction active high/low the same?

Are you using constant velocity? 

Greg
Re: Help with 4th axis
« Reply #11 on: August 07, 2010, 07:36:23 PM »
Here is a copy of my xml file.
"Gravity, its not just a good idea its the law"

Offline Greolt

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Re: Help with 4th axis
« Reply #12 on: August 07, 2010, 11:52:09 PM »
Astroguy

You posted one xml, so I presume this is the one used for everything.

I know nothing of the Taig machine, but that acceleration seems to be extremely low on X, Y and Z axis.  Is that normal?

You have CV set.  Do you have a reason to set "G100 Adaptive NurbsCV" ?

The rotary axis acceleration in comparison to the other linear axis is very high.  400 as against 3.  This could be a problem.

Artsoft have told me mixed stories on CV and rotary axis. 

First I was told CV will not work with a rotary axis.

And then, that the acceleration settings should be as closely matched to the linear axis as possible for CV to work.

Might be worth trying to match them a little more closely.

Greg
Re: Help with 4th axis
« Reply #13 on: August 08, 2010, 09:38:00 AM »
The reason the acceleration is different is because the rotart table has a 72 to 1 gear ratio and a much smaller motor, I was told by other users of this rotary table to use that setting. As far as the G100 Adaptive NubsCV I do not even know what this does and it has always been checked, I will try it without. Should I also change the motion mode to exact stop?
"Gravity, its not just a good idea its the law"
Re: Help with 4th axis
« Reply #14 on: August 08, 2010, 12:58:38 PM »
Astroguy

You posted one xml, so I presume this is the one used for everything.

I know nothing of the Taig machine, but that acceleration seems to be extremely low on X, Y and Z axis.  Is that normal?

You have CV set.  Do you have a reason to set "G100 Adaptive NurbsCV" ?

The rotary axis acceleration in comparison to the other linear axis is very high.  400 as against 3.  This could be a problem.

Artsoft have told me mixed stories on CV and rotary axis. 

First I was told CV will not work with a rotary axis.

And then, that the acceleration settings should be as closely matched to the linear axis as possible for CV to work.

Might be worth trying to match them a little more closely.

Greg

Thanks Greg, I set the acceleration down to 5 and unchecked "G100 Adaptive NurbsCV" and BINGO no more loosing steps on Z.

Thank you so much for taking the time to help me, I have a lot to learn which is hard when I only have a few hours a week to use my machine.

Fred
"Gravity, its not just a good idea its the law"

Offline Greolt

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Re: Help with 4th axis
« Reply #15 on: August 08, 2010, 08:56:21 PM »
Good to hear you got it going.

Greg