Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: cbade on February 07, 2012, 03:11:01 PM

Title: Pause between g-code steps
Post by: cbade on February 07, 2012, 03:11:01 PM

New here.. looking for help with a Mach3 issue. Sorry if this is the wrong place to start this thread.

When running a program, there is a short pause between g-code moves.
I have checked that it's set to Constant Velocity not Exact Stop. Any other ideas on how to fix this?

Could very well be my g-code is poorly written and it's not a Mach3 problem at all...

Thanks,
cbade

Title: Re: Pause between g-code steps
Post by: Hood on February 07, 2012, 04:42:17 PM

Does your G Code have a G61 in it?
Hood

Title: Re: Pause between g-code steps
Post by: cbade on February 07, 2012, 04:47:39 PM

It does not. I also checked in the settings to be sure the Constant Velocity is checked. I can add a G64 and try the code again.

Title: Re: Pause between g-code steps
Post by: Hood on February 07, 2012, 04:49:06 PM

If you attach your code and your xml maybe the issue can be found.
Hood

Title: Re: Pause between g-code steps
Post by: cbade on February 07, 2012, 04:55:58 PM

I've attached the .XML used and the G-code in question. The pause happens between each move.

Thanks for your help.

Title: Re: Pause between g-code steps
Post by: Hood on February 07, 2012, 05:11:33 PM

Look on Settings page and disable CV Feedrate and see if that helps.

Hood

Title: Re: Pause between g-code steps
Post by: cbade on February 07, 2012, 05:32:39 PM

Looks like that did the trick. The setting was at +1.000 and I disabled it.

I'm curious as to why this is the fix.. I'll do some google searching.

Thanks a ton! You're the man, Hood.

Title: Re: Pause between g-code steps
Post by: Hood on February 07, 2012, 05:37:07 PM

I would say what that means is you were telling the machine to slow to 1 unit per min before doing the CV.
Hood

Title: Re: Pause between g-code steps
Post by: cbade on February 07, 2012, 05:40:30 PM

So another fix could be to change the CV Feed-rate value to the same as the feed-rate set by the G-code? I'll try it.

Title: Re: Pause between g-code steps
Post by: Hood on February 07, 2012, 05:45:36 PM

Yes that should work but usually its just disabled by default I think. I imagine it is meant for people who have machines that are not very rigid but with fast acceleration, could be wrong though :)
Hood

Title: Re: Pause between g-code steps
Post by: cbade on February 07, 2012, 05:48:52 PM

Found this via another forum:
http://www.machsupport.com/docs/Mach3_CVSettings_v2.pdf

It recommends enabling CV and disabling all CV settings until more familiar with the system and its interactions.

Thanks again for your help in solving this issue.

Title: Re: Pause between g-code steps
Post by: Hood on February 07, 2012, 05:49:57 PM

No probs :)
Hood

Title: Re: Pause between g-code steps
Post by: stirling on February 08, 2012, 07:48:43 AM

I would take that doc with a pinch of salt. As I've said in many threads - it's not very good and in some places just plain wrong.

Your original CV Distance of 1.0 means you're allowing (not telling) CV to drop to 1 unit/min if it needs to which is (as you've found on your machine) just about the same as exact stop. Setting this to your commanded feedrate is pointless - CV can't do that by it's very nature.

Ian