Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: Trisdan on October 25, 2011, 06:50:39 AM
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I'm new to this, but tried to use the wizard for cut circle.
When I try diameter 30 I get 56, on the display while cutting the numbers for X goes from -12,8 to +38, and for Y from -25,7 to +25,7.
This is quite frustrating, do anyone have an idea what I'm doing wrong?
The G code is :
F400
G00 Z10
G00 X12.9 Y0
G00 Z1
G01 Z-0.5 F50
G02 X12.9 Y0 I-12.9 J0 F400
G01 Z-1 F50
G02 X12.9 Y0 I-12.9 J0 F400
G01 Z-1.5 F50
G02 X12.9 Y0 I-12.9 J0 F400
G01 Z-2 F50
G02 X12.9 Y0 I-12.9 J0 F400
G01 Z-2.5 F50
G02 X12.9 Y0 I-12.9 J0 F400
G01 Z-2.9 F50
G02 X12.9 Y0 I-12.9 J0 F400
G00 Z10
G00 X13 Y0
G01 Z-2 F400
G01 Z-3 F50
G03 X13 Y0 I-13 J0 F400
G00 Z10
G00 X0 Y0
M30
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Trisdan,
Your code is OK and the extents are + and - 13.0000 for both the X and Y axis (see pic)
Are your work offsets set to zero ??
Tweakie.
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Thank you for help, but I don't manage to change it, it jumps back if I try to put in a new value.
I tried to get around the problem by using a 8mm tool to get 60mm hole instead of 56mm , but now the awful machine make a hole of 120mm , and the program limits are now x -84 , + 28 and y -56 , +56. Why do they jump around and make the hole anything but right?
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Are you reading MACHINE coords., or PROGRAM/PART coords. ?
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You also have to hit the ENTER key after a DRO entry in order to make it "stick".
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In the Tool Path , the window Program Limits Absolute Coordinates , it looks like the picture from Tweakie but the values are all 0 before I load the wizard and after I loaded it the x range is -84.000 +28.000 and y range is -56.000 +56.000 and I can not alter the values even if I hit the ENTER key after entering new values.
I tested in MDI mode setting x and y and z to zero and wrote g-code in the INPUT line : G02 X0 Y0 I-27.9 J0 F100 and that made a nice circle of right dimension.
Is something wrong in the Tool Path and I how can I correct it?
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Hi Trisdan,
I think you need to set your work offsets to zero (then regen toolpath to see the changes) if you want the program limits to show just + and - 13 etc.
Tweakie.
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Thank you for giving me good advices.
When I start Mach3 the values in Offsets (Alt-5) menu are all 0 , but after moving the machine to where I want to have it as start point and in the Program Run (Alt-1) menu pushing the zero x end y button , it is impossible to get 0 in all the Offsets (Alt-5) menu. This probably meant to be so but running the g-code program from the cut circle wizard makes the circle totally wrong seize, are these problems connected?
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OK, I think I understand now. ;)
Go into config / general config page and change IJ Mode to Inc
That should do it.
Tweakie.
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YES, that's right,
Thank you very much! It made the circle perfect now !
That was far from obvious for me, to find that hidden adjustment in the ocean of settings.
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Really the code should set the correct mode with a G90.1 or G91.1, obviously the wizard is not doing that but really it should.
Hood