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Author Topic: Machine is cutting faster than it is told to..  (Read 3496 times)

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Machine is cutting faster than it is told to..
« on: June 15, 2013, 03:52:32 PM »
Installed a new computer... Reinstalled Mach3, V Carve Pro, etc...

Resurfacing a table Jig....

Machine is jogging at 850-900 IPS, when set to 600 IPS in the motor tunings page...

Machine is cutting at 524 IPS when the VCP file says 350IPS... G Code says 350 IPS..
Feedrate is set to 100%...

Dimensionally, the machine is doing what it is told to...  just the feedrate is increased by 50%

Not a big deal for resurfacing as I'm only cutting a few thousandths, but I don't want to run any projects with it like this...

Any ideas what might cause this?
 ???
Re: Machine is cutting faster than it is told to..
« Reply #1 on: June 15, 2013, 03:58:50 PM »
jog speed set to 100%
spindle speed is running as it is told to..

Only feedrate appears to be affected...
  :o
Re: Machine is cutting faster than it is told to..
« Reply #2 on: June 15, 2013, 04:31:20 PM »
Steps Per correct?  Micro steps correct?
John Champlain

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Re: Machine is cutting faster than it is told to..
« Reply #3 on: June 15, 2013, 05:09:40 PM »
It will be IPM rather than IPS but anyway thats not the issue.
If you attach your xml and the code I will see if it runs ok here.
Hood
Re: Machine is cutting faster than it is told to..
« Reply #4 on: June 15, 2013, 05:51:14 PM »
Yeah, I meant IPM....  Too many acronyms these days... ;D

Here is the xml and the G Code file...

Thanks,
 Mark

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Re: Machine is cutting faster than it is told to..
« Reply #5 on: June 15, 2013, 06:30:27 PM »
Seems to be working fine here.
Can you load the standard screenset and see if the Feed DRO reads correctly in it.
Also have a look on the diagnostics page and see what the frequency is reading.
Hood
Re: Machine is cutting faster than it is told to..
« Reply #6 on: June 15, 2013, 07:21:54 PM »
I'd have to reinstall the app to get back to the standard screen set..

Frequency is reading 28040
Re: Machine is cutting faster than it is told to..
« Reply #7 on: June 15, 2013, 07:27:06 PM »
sorry, I was wrong, loading the standard screen is actually very easy.. hold on...


Re: Machine is cutting faster than it is told to..
« Reply #8 on: June 15, 2013, 07:40:05 PM »
yeah, operates the same as the custom screenset..

Here's the deal.. After quitting Mach and then reloading it, jog speeds changed to 672, which is 112% of what it is set to.. 112% of 25k is 28k.. what the frequency is reading...  After running the surfacing file again, it is now running at 392, exactly 112% of 350IPM...

I remember when I first ran the driver test, the pulse frequency was reading at about 36-37k, which is about 150% of the desired speed.. then it settled down to 27-28k...

So, obviously this is a kernel speed issue....  How do I get it to settle down and run at 25k?

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Re: Machine is cutting faster than it is told to..
« Reply #9 on: June 16, 2013, 02:35:40 AM »
Try setting the kernel to 35KHz and restart Mach and see if that helps.
Hood