Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: cut2spec on April 19, 2009, 01:17:39 PM
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Although we have had some good advice from Hood we are stilll baffled. We are cutting a part from 1/4" Lexan using 1/8" bit on both machines. Feedrate on the router is at 65 and on milll at 6 and spindlle speed is 24,500 and 3500 respectively. Both parts are coming out nice but they do not match. We have done extensive testing on the router and feel that we are okay with basic motor tuning, machine setup and so on making us think we have something wrong in the MACH3 setup but can't find anything with our limited experience. We are using MACH3 on a mill, router and lathe and until now have been able to get what we want.
The router is cutting this 7.5" X 3.75" (approx) part about 1 tool width smaller than the mill cuts it. We are using the exact same Gcode on both machines witht he only difference being feedrate. Circles on the part cut very well. As the cut proceeds along the part the error seems to increase but this is difficult to track as the code has the cutter moving around the part quite a bit.
Any suggestions would be appreiated.
Paul and Ben
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Please post your g-code.
Are outside shapes under size and inner shapes too big or what?
Graham
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Outside and inside dimensions are too small. The part we cut on the router is smaller than the drawing and smaller than the part we cut on the mill. Would it be helpful to provide exact dimensions?
Below is the code
N5 (File router G2 mill 2 )
N10 (Default Mill Post)
N15 (File Posted in Mill Mode)
N20 (Tuesday, April 14, 2009)
N25 G90 G80 G40 G91.1
N30 G1 Z0.2000 F65
N35 X0.3940 Y1.2337
N40 M3
N45 Z-0.2500
N55 G1 z0.200
N60 X0.6770 Y1.2209
N65 Z0.1000
N70 G1 Z-0.1280
N75 G2 X1.1277 Y0.3218 I0.4506 J-0.3366
N80 X0.6770 Y1.2209 I-0.0000 J0.5625
N85 G1 Z-0.0280
N90 G1 Z-0.2500
N95 G2 X1.1277 Y0.3218 I0.4506 J-0.3366
N100 X0.6770 Y1.2209 I-0.0000 J0.5625
N105 G1 Z0.2000
N110 X0.0000 Y1.7686
N115 Z0.1000
N120 G1 Z-0.1000
N125 X0.2388 Y1.7686
N135 X0.0000 Y1.7686
N145 G1 Z-0.1800
N150 X0.2388 Y1.7686
N155 G1 Z0.2000
N160 X0.0000 Y2.5020
N165 Z0.1000
N170 G1 Z-0.1000
N175 X0.2410 Y2.5020
N185 X0.0000 Y2.5020
N195 G1 Z-0.1800
N200 X0.2410 Y2.5020
N205 G1 Z0.2000
N210 X0.1500 Y1.7686
N215 Z0.1000
N220 G1 Z-0.1000
N225 X0.1500 Y2.5020
N235 X0.1500 Y1.7686
N245 G1 Z-0.1800
N250 X0.1500 Y2.5020
N255 G1 Z0.2000
N260 X0.0500 Y1.7686
N265 Z0.1000
N270 G1 Z-0.1000
N275 X0.0500 Y2.5020
N285 X0.0500 Y1.7686
N295 G1 Z-0.1800
N300 X0.0500 Y2.5020
N305 G1 Z0.2000
N310 X0.3940 Y3.0370
N315 Z-0.2500
N325 G1 Z0.200
N330 X2.5415 Y2.5021
N335 Z-0.1610
N340 G1 X2.5415 Y2.9120
N345 X2.3440 Y2.9120
N350 X2.3440 Y2.5021
N355 G1 Z0.2000
N360 X2.4415 Y2.5021
N365 Z0.1000
N370 G1 Z-0.1610
N375 X2.4415 Y2.9120
N380 G1 Z0.2000
N385 X2.4553 Y0.7439
N390 Z0.1000
N395 G1 Z-0.1000
N400 X2.4553 Y1.2990
N410 X2.4553 Y0.7439
N420 G1 Z-0.1950
N425 X2.4553 Y1.2990
N435 X2.5553 Y0.7439
N445 G1 Z-0.1000
N450 X2.5553 Y1.2990
N460 X2.5553 Y0.7439
N470 G1 Z-0.1950
N475 X2.5553 Y1.2990
N485 X2.6553 Y0.7439
N495 G1 Z-0.1000
N500 X2.6553 Y1.2990
N510 X2.6553 Y0.7439
N520 G1 Z-0.1950
N525 X2.6553 Y1.2990
N535 X2.3553 Y0.7439
N545 G1 Z-0.1000
N550 X2.3553 Y1.2990
N560 X2.3553 Y0.7439
N570 G1 Z-0.1950
N575 X2.3553 Y1.2990
N585 X2.2553 Y0.7439
N595 G1 Z-0.1000
N600 X2.2553 Y1.2990
N610 X2.2553 Y0.7439
N620 G1 Z-0.1950
N625 X2.2553 Y1.2990
N635 X2.2553 Y0.7370
N645 G1 Z-0.1000
N650 X2.6719 Y0.7370
N660 X2.2553 Y0.7370
N670 G1 Z-0.1950
N675 X2.6719 Y0.7370
N680 G1 Z0.2000
N685 X2.3440 Y0.7320
N690 Z0.1000
N695 G1 Z-0.1610
N700 X2.3440 Y0.5370
N705 X2.5415 Y0.5370
N710 X2.5415 Y0.7320
N715 G1 Z0.2000
N720 X2.4440 Y0.5370
N725 Z0.1000
N730 G1 Z-0.1610
N735 X2.4440 Y0.7320
N740 G1 Z0.2000
N745 X2.9200 Y1.3686
N750 Z0.1000
N755 G1 Z-0.1280
N760 X2.9200 Y1.7686
N765 X3.1700 Y1.7686
N770 X3.1700 Y2.5020
N775 X0.2500 Y2.5020
N780 X0.2500 Y1.7686
N785 X2.0357 Y1.7686
N790 X2.0357 Y1.5271
N795 X2.2560 Y1.3068
N800 X2.6928 Y1.3068
N805 X2.6928 Y0.6745
N810 X2.9218 Y0.6745
N815 X2.9218 Y0.8146
N820 X3.5424 Y0.8146
N825 X3.5424 Y1.3686
N830 X2.9200 Y1.3686
N835 G1 Z-0.0280
N840 G1 Z-0.2500
N845 X2.9200 Y1.7686
N850 X3.1700 Y1.7686
N855 X3.1700 Y2.5020
N860 X0.2500 Y2.5020
N865 X0.2500 Y1.7686
N870 X2.0357 Y1.7686
N875 X2.0357 Y1.5271
N880 X2.2560 Y1.3068
N885 X2.6928 Y1.3068
N890 X2.6928 Y0.6745
N895 X2.9218 Y0.6745
N900 X2.9218 Y0.8146
N905 X3.5424 Y0.8146
N910 X3.5424 Y1.3686
N915 X2.9200 Y1.3686
N920 G1 Z0.2000
N925 X2.8845 Y0.3372
N930 Z-0.2500
N940 G1 z0.200
N945 X5.2857 Y0.9820
N950 Z-0.1610
N955 G1 X3.5424 Y0.9820
N960 G1 Z0.2000
N965 X5.2857 Y1.0820
N970 Z0.1000
N975 G1 Z-0.1610
N980 X3.5424 Y1.0820
N985 G1 Z0.2000
N990 X5.2857 Y1.1795
N995 Z0.1000
N1000 G1 Z-0.1610
N1005 X3.5424 Y1.1795
N1010 G1 Z0.2000
N1015 X4.0134 Y0.7257
N1020 Z0.1000
N1025 G1 Z-0.1280
N1030 X4.0134 Y1.4258
N1035 X4.4509 Y1.4258
N1040 X4.4509 Y0.7257
N1045 X4.0134 Y0.7257
N1050 G1 Z-0.0280
N1055 G1 Z-0.2500
N1060 X4.0134 Y1.4258
N1065 X4.4509 Y1.4258
N1070 X4.4509 Y0.7257
N1075 X4.0134 Y0.7257
N1080 G1 Z0.2000
N1085 X4.0093 Y2.3889
N1090 Z0.1000
N1095 G1 Z-0.1700
N1100 G2 X4.2929 Y1.8230 I0.2836 J-0.2119
N1105 X4.0093 Y2.3889 I-0.0000 J0.3540
N1115 G1 X3.9292 Y2.4487
N1130 G2 X4.2929 Y1.7230 I0.3637 J-0.2717
N1135 X3.9292 Y2.4487 I-0.0000 J0.4540
N1145 G1 X3.8491 Y2.5085
N1160 G2 X4.2929 Y1.6230 I0.4438 J-0.3315
N1165 X3.8491 Y2.5085 I-0.0000 J0.5540
N1175 G1 X3.7690 Y2.5684
N1190 G2 X4.2929 Y1.5230 I0.5240 J-0.3914
N1195 X3.7690 Y2.5684 I-0.0000 J0.6540
N1205 G1 X3.6888 Y2.6282
N1220 G2 X4.2929 Y1.4230 I0.6041 J-0.4512
N1225 X3.6888 Y2.6282 I-0.0000 J0.7540
N1235 G1 X3.1700 Y2.6854
N1250 X3.7361 Y2.6854
N1260 X3.7379 Y2.6874
N1275 X3.4415 Y2.5904
N1285 X4.7116 Y2.8041
N1300 X4.5538 Y3.0596
N1305 X3.4104 Y2.6854
N1315 X4.6815 Y2.8528
N1330 G2 X3.6606 Y2.5854 I-0.3715 J-0.6644
N1335 G1 X3.1700 Y2.5854
N1345 X3.1700 Y2.7120
N1360 X3.1700 Y2.5095
N1370 X3.1700 Y2.5120
N1385 X2.4448 Y2.5120
N1395 X3.1700 Y2.6120
N1410 X2.4448 Y2.6120
N1415 G1 Z0.2000
N1420 X4.5849 Y2.9646
N1425 Z0.1000
N1430 G1 Z-0.1700
N1435 X4.4388 Y2.9168
N1445 X4.5418 Y2.8887
N1460 X4.4687 Y3.0071
N1465 G1 Z0.2000
N1470 X2.4448 Y2.7120
N1475 Z0.1000
N1480 G1 Z-0.1700
N1485 X3.1700 Y2.7120
N1490 X3.8838 Y2.9456
N1495 X4.5976 Y3.1792
N1500 X4.9755 Y2.5669
N1505 G1 Z0.2000
N1510 X4.0894 Y2.3290
N1515 Z0.1000
N1520 G1 Z-0.1280
N1525 G2 X4.2929 Y1.9230 I0.2035 J-0.1520
N1530 X4.0894 Y2.3290 I-0.0000 J0.2540
N1535 G1 Z-0.0280
N1540 G1 Z-0.2500
N1545 G2 X4.2929 Y1.9230 I0.2035 J-0.1520
N1550 X4.0894 Y2.3290 I-0.0000 J0.2540
N1555 G1 Z0.2000
N1560 X2.8845 Y3.0370
N1565 Z-0.2500
N1575 G1 z0.200
N1580 X6.4284 Y2.9769
N1585 Z-0.1600
N1590 G1 X6.4284 Y2.8674
N1595 X6.2334 Y2.8674
N1600 X6.2334 Y3.0280
N1610 X6.3334 Y2.8674
N1620 G1 Z-0.1600
N1625 X6.3334 Y3.0280
N1630 G1 Z0.2000
N1635 X6.3084 Y2.2382
N1640 Z0.1000
N1645 G1 Z-0.0810
N1650 X6.3084 Y3.0088
N1660 X6.3534 Y2.2508
N1675 X6.3534 Y2.9970
N1680 G1 Z0.2000
N1685 X6.6759 Y2.6131
G1 Z-0.2500
G1 Z0.200
N1695 X5.7908 Y2.3338
G1 Z-0.2500
G1 Z0.200
N1700 X5.0536 Y1.4325
G1 Z-0.2500
G1 Z0.200
N1715 X5.2857 Y0.4729
N1720 Z-0.1260
N1725 G1 X4.9782 Y0.4729
N1730 X4.9782 Y0.6079
N1735 X5.2857 Y0.6079
N1740 G1 Z0.2000
N1745 X5.2857 Y0.5404
N1750 Z0.1000
N1755 G1 Z-0.1260
N1760 X4.9782 Y0.5404
N1765 G1 Z0.2000
N1770 X5.0536 Y0.2702
N1775 Z-0.2500
N1785 G1 z0.200
N1790 X5.2857 Y0.0145
N1795 Z-0.1280
N1800 G1 X5.2857 Y1.7614
N1805 G2 X5.4681 Y2.0021 I0.2500 J-0.0000
N1810 G1 X7.2148 Y2.4928
N1815 G3 X7.2123 Y2.7341 I-0.0338 J0.1203
N1820 X1.6402 Y3.2580 I-3.8490 J-11.0443
N1825 G2 X1.4123 Y3.2874 I-0.0684 J0.3687
N1830 G3 X0.2012 Y3.7026 I-2.4999 J-5.3171
N1835 X0.0000 Y3.5400 I-0.0282 J-0.1710
N1840 G1 X0.0000 Y0.0000
N1845 X5.2857 Y0.0000
N1850 X5.2857 Y0.0145
N1855 G1 Z-0.0280
N1860 G1 Z-0.2500
N1865 X5.2857 Y1.7614
N1870 G2 X5.4681 Y2.0021 I0.2500 J-0.0000
N1875 G1 X7.2148 Y2.4928
N1880 G3 X7.2123 Y2.7341 I-0.0338 J0.1203
N1885 X1.6402 Y3.2580 I-3.8490 J-11.0443
N1890 G2 X1.4123 Y3.2874 I-0.0684 J0.3687
N1895 G3 X0.2012 Y3.7026 I-2.4999 J-5.3171
N1900 X0.0000 Y3.5400 I-0.0282 J-0.1710
N1905 G1 X0.0000 Y0.0000
N1910 X5.2857 Y0.0000
N1915 X5.2857 Y0.0145
N1920 G1 Z0.2000
N1925 M5 M9
N1930 X0.0 Y0.0
N1935 G40 G80
M30
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Graham- I should also point out the differences increase the further the cutter gets from the start point. On our parts we are cutting a 1.25 circle. There is a left and a right part. On the left part the center of the circle is cut about about 4" from the start point. This circle is approx .125 short of hwere it should be. On the right side part the center of the circle is about .75" from the start. That circle is about .075 of where it should be. Depending on where I set the mic Both circles measure 1.25-1.26
Thanks, Paul
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Hi Paul,
Are you using the same PC for both the Mill and Router operation ?.
Tweakie.
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Hi Tweakie- Two different computers plus two different versions of Mach 3
Paul
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In motor tuning, what is your steps per set at?
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Steps per are set at 509.3108387
My driver is set at 1/8, steppers are 200 rev
All axis have 16 pitch 1" gear
I divided 1600 by 3.1415 to set the steps on the router
I have checked this with a dial indicator (1/2" and 1" moves) and it was right on
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Try setting your steps to 509.090909 and try again.
Graham