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Cut is off to one side
« on: August 10, 2009, 01:51:31 PM »
Hi All

Can anyone tell me why my plasma cutter is cutting to one side more than the other in the attached pic? ???

thanks
Dave

Offline Chip

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Re: Cut is off to one side
« Reply #1 on: August 10, 2009, 04:12:03 PM »
Hi, Dave

Post your DXF file, Then we can look at it.

Chip
Re: Cut is off to one side
« Reply #2 on: August 10, 2009, 07:25:26 PM »
I cutthis same file on the laser where I work and it cut fine. this happens to a lot of my files.
I attached the dxf and the tap files. also these files where converted with SheetCam.

Offline Chip

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Re: Cut is off to one side
« Reply #3 on: August 10, 2009, 09:14:51 PM »
Hi, Dzackman

Are you using the same tap file for the laser and the plasma ?

Have you checked your Steps Per unit ( Calibration ) in X & Y axises with a 20 inch move for accuracy ?

I'd also try running Mach3 in Sherline 1/2 Step Mode.

Are you using Backlash and have you checked for backlash on your axises ?

Just some initial thoughts, Chip
« Last Edit: August 11, 2009, 03:18:01 PM by Chip »
Re: Cut is off to one side
« Reply #4 on: August 11, 2009, 01:49:44 PM »
Hi Chip


The laser uses its own cam software (Cadman) to convert dxf files
When I setup my table I used 2” throw dial indicators and the DRO. The steps were within .001-.002
(509 steps per inch).
As for as Sherline mode I’ll try it and let you know.
I don’t have any backlash and it’s not setup in MACH3.

Thanks

Offline Chip

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Re: Cut is off to one side
« Reply #5 on: August 11, 2009, 06:00:48 PM »
Hi, Dzackman

If your steps per values are 509 per inch and you have an error of .002 per unit, Then on a 20 unit move of your axises error could be .040 just with that may be why the large outside profile is shifted sow much and the inner profile cuts look closer to what thy should.

On your stepper controls see if theirs a micro step by 10, That would give you a steps per value of 5090 or so giving you the ability to calibrate your axises more accurately.

If you used the center of the part as the origin 0,0 point then the errors would be distributed from side to side up and down, See pic's.

Just some more thoughts, Chip
« Last Edit: August 11, 2009, 06:23:29 PM by Chip »
Re: Cut is off to one side
« Reply #6 on: August 27, 2009, 02:42:29 PM »
Chip,
I set up for running Mach3 in Sherline 1/2 Step Mode and so far that seems to have done the trick.

Thankyou very much
Dave

Offline Chip

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Re: Cut is off to one side
« Reply #7 on: August 27, 2009, 05:07:01 PM »
Hi, Dave

Glad you got it sorted out.

Chip