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Author Topic: Cutting Circles  (Read 11719 times)

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vmax549

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Re: Cutting Circles
« Reply #10 on: November 13, 2007, 03:04:34 PM »
How did you program the code to machine the circle ???

(;-) TP
Re: Cutting Circles
« Reply #11 on: November 13, 2007, 03:14:56 PM »
Ran my DXF file thru LazyCam.

Offline Graham Waterworth

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Re: Cutting Circles
« Reply #12 on: November 13, 2007, 03:29:28 PM »
What diameter is your circle and how long are the flats?

Graham.
Never give up, time will pass, the cloud will clear, the sun will shine once more.
Re: Cutting Circles
« Reply #13 on: November 13, 2007, 03:34:57 PM »
Had 2 - 1/2" circles & they turned out to be rounded squares. Had a 1 1/2" circle & it was better but had some small flats. Useing an 1/8" bit.

Offline Hood

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Re: Cutting Circles
« Reply #14 on: November 14, 2007, 03:29:44 AM »
Use the circle cutting wizard and see what the circles turn out like.
Hood
Re: Cutting Circles
« Reply #15 on: November 14, 2007, 05:51:55 PM »
I can't figure out how to use the wizard. Here is the extracted code from the Gcode for the 1/2" circle. It looks good to me. Maybe you can see something.

N1450 G0  Z0.5000
N1455  X7.2003  Y2.2248
N1460  Z0.1000
N1465 G1  Z-0.2500  F30.00
N1470 G2  X7.5000  Y2.3750  I0.1122  J0.1502  F15.00
N1475  X7.2003  Y2.2248  I-0.1875  J0.0000
N1480 G0  Z-0.1500
N1485 G1  Z-0.5000  F30.00
N1490 G2  X7.5000  Y2.3750  I0.1122  J0.1502  F15.00
N1495  X7.2003  Y2.2248  I-0.1875  J0.0000
N1500 G0  Z-0.4000
N1505 G1  Z-0.7500  F30.00
N1510 G2  X7.5000  Y2.3750  I0.1122  J0.1502  F15.00
N1515  X7.2003  Y2.2248  I-0.1875  J0.0000

Ron
Re: Cutting Circles
« Reply #16 on: November 14, 2007, 06:13:43 PM »
I took out the 1 1/2" circle, put it into Mach3Mill & then loaded it into LazyCam. The top & bottom look OK but the right & left sides do not & thats where I had the problems with being off. Here is the code.

N5 (File trimer hold mold and top bottom z axis )
N10 (Default Mill Post)
N15 (File Posted in Mill Mode)
N20 (Tuesday, November 06, 2007)
N25 G90 G80 G40 G91.1
N30 M5 M9
N35 M6 T1(TOOL Change)
N40 G43 H1
N45 G0  Z0.5000
N50  X1.0767  Y0.5987
N55  Z0.1000
N60 M3
N65 G1  Z-0.2500  F30.00
N70 G2  X2.8750  Y1.5000  I0.6733  J0.9013
N75  X1.0767  Y0.5987  I-1.1250  J0.0000
N80 G0  Z-0.1500
N85 G1  Z-0.5000 
N90 G2  X2.8750  Y1.5000  I0.6733  J0.9013
N95  X1.0767  Y0.5987  I-1.1250  J0.0000
N100 G0  Z-0.4000
N105 G1  Z-0.7500 
N110 G2  X2.8750  Y1.5000  I0.6733  J0.9013
N115  X1.0767  Y0.5987  I-1.1250  J0.0000
N120 G0  Z0.5000

Ron

Offline docltf

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Re: Cutting Circles
« Reply #17 on: November 15, 2007, 03:53:45 AM »
rkjohn

      if you can run a .250 end mill this cuts a 2.5 circle. it will make two rough passes and one finish pass.

      g00 g20 g91.1
g00 z.100
g00 x-.975 y.975
g01 z-.250 f25
g02 x-.975 y.975 i.975 j-.975
g01 z-.500
g02 x-.975 y.975 i.975 j-.975
g01 x-.9723 y.9723
g02 x-.9723 y.9723 i.9723 j-.9723
g00 z.100
g00 x0 y0
m30





Re: Cutting Circles
« Reply #18 on: November 15, 2007, 03:52:21 PM »
I changed your code to cut 1/4" & slower. Here is a pic of how it turned out.
I must have some backlash but I can not measure it with a dial.
I also tried to load the gcode into LazyCam & had an unrecoverable error.

Offline Chip

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Re: Cutting Circles
« Reply #19 on: November 15, 2007, 04:27:31 PM »
Hi, Rkjohn

Have you checked if your in CV Mode, May be causing the Problem, Config, General Config, "Motion Mode", set to Exact Stop.

Thanks, Chip