Need Help! Machining arcs - Page 2


Page 2 of 2 FirstFirst 12
Results 21 to 26 of 26

Thread: Machining arcs

  1. #21
    Community Moderator Jim Dawson's Avatar
    Join Date
    Dec 2013
    Posts
    5717
    Downloads
    0
    Uploads
    0

    Default Re: Machining arcs

    Quote Originally Posted by HomerSimpson View Post
    Jim, I have fitted a bezier spline to the arcs and machined those. Is that what you mean? This yielded worse results.

    .
    No I don't think so. The following G code is your toolpath from above converted to line segments, with 0.01'' resolution, rather than using G2, G3 moves for the arcs.

    N15 G17
    N20 M3 S1000
    N25 G0 Z0.5
    N30 G0 X0.1 Y-0.0875
    N35 G0 Z0.0625
    N40 G1 F5.0 Z-0.06
    N45 G1 X0.0396 Y-0.0775
    N50 G1 X-0.0144 Y-0.0486
    N55 G1 X-0.0562 Y-0.0038
    N60 G1 X-0.0813 Y0.0521
    N65 G1 X-0.0875 Y0.1
    N70 G1 X-0.0775 Y0.5011
    N75 G1 X-0.0476 Y0.9012
    N80 G1 X0.0022 Y1.2994
    N85 G1 X0.0719 Y1.6945
    N90 G1 X0.1611 Y2.0857
    N95 G1 X0.2697 Y2.472
    N100 G1 X0.3974 Y2.8524
    N105 G1 X0.5439 Y3.2259
    N110 G1 X0.7088 Y3.5917
    N115 G1 X0.8918 Y3.9488
    N120 G1 X1.0923 Y4.2963
    N125 G1 X1.3099 Y4.6335
    N130 G1 X1.5441 Y4.9593
    N135 G1 X1.7941 Y5.2731
    N140 G1 X2.0595 Y5.574
    N145 G1 X2.3396 Y5.8614
    N150 G1 X2.4717 Y5.9874
    N155 G1 X2.7513 Y6.2618
    N160 G1 X3.0166 Y6.5501
    N165 G1 X3.2668 Y6.8515
    N170 G1 X3.5013 Y7.1654
    N175 G1 X3.7194 Y7.4908
    N180 G1 X3.9207 Y7.8269
    N185 G1 X4.1046 Y8.1729
    N190 G1 X4.2705 Y8.5277
    N195 G1 X4.4182 Y8.8906
    N200 G1 X4.5471 Y9.2606
    N205 G1 X4.657 Y9.6366
    N210 G1 X4.7475 Y10.0178
    N215 G1 X4.8185 Y10.4031
    N220 G1 X4.8698 Y10.7915
    N225 G1 X4.9011 Y11.182
    N230 G1 X4.9125 Y11.5736
    N235 G1 Y11.6
    N240 G1 X4.9025 Y11.9917
    N245 G1 X4.8724 Y12.3823
    N250 G1 X4.8225 Y12.7709
    N255 G1 X4.7529 Y13.1565
    N260 G1 X4.6636 Y13.538
    N265 G1 X4.555 Y13.9144
    N270 G1 X4.4273 Y14.2848
    N275 G1 X4.2809 Y14.6482
    N280 G1 X4.1161 Y15.0037
    N285 G1 X3.9335 Y15.3503
    N290 G1 X3.7333 Y15.6871
    N295 G1 X3.5162 Y16.0133
    N300 G1 X3.2828 Y16.3279
    N305 G1 X3.0336 Y16.6303
    N310 G1 X2.7693 Y16.9195
    N315 G1 X2.4906 Y17.1949
    N320 G1 X2.4717 Y17.2126
    N325 G1 X2.1851 Y17.4936
    N330 G1 X1.913 Y17.7884
    N335 G1 X1.6559 Y18.0965
    N340 G1 X1.4144 Y18.417
    N345 G1 X1.1892 Y18.7491
    N350 G1 X0.9809 Y19.092
    N355 G1 X0.7899 Y19.4449
    N360 G1 X0.6167 Y19.8069
    N365 G1 X0.4617 Y20.177
    N370 G1 X0.3254 Y20.5544
    N375 G1 X0.2081 Y20.9382
    N380 G1 X0.11 Y21.3273
    N385 G1 X0.0315 Y21.7208
    N390 G1 X-0.0274 Y22.1177
    N395 G1 X-0.0664 Y22.517
    N400 G1 X-0.0854 Y22.9179
    N405 G1 X-0.0875 Y23.1
    N410 G1 X-0.0775 Y23.1604
    N415 G1 X-0.0486 Y23.2144
    N420 G1 X-0.0038 Y23.2562
    N425 G1 X0.0521 Y23.2813
    N430 G1 X0.1 Y23.2875
    N435 G1 X23.1
    N440 G1 X23.1604 Y23.2775
    N445 G1 X23.2144 Y23.2486
    N450 G1 X23.2562 Y23.2038
    N455 G1 X23.2813 Y23.1479
    N460 G1 X23.2875 Y23.1
    N465 G1 X23.2775 Y22.6989
    N470 G1 X23.2476 Y22.2988
    N475 G1 X23.1978 Y21.9006
    N480 G1 X23.1281 Y21.5055
    N485 G1 X23.0389 Y21.1143
    N490 G1 X22.9303 Y20.728
    N495 G1 X22.8026 Y20.3476
    N500 G1 X22.6561 Y19.9741
    N505 G1 X22.4912 Y19.6083
    N510 G1 X22.3082 Y19.2512
    N515 G1 X22.1077 Y18.9037
    N520 G1 X21.8901 Y18.5665
    N525 G1 X21.6559 Y18.2407
    N530 G1 X21.4059 Y17.9269
    N535 G1 X21.1405 Y17.626
    N540 G1 X20.8604 Y17.3386
    N545 G1 X20.7283 Y17.2126
    N550 G1 X20.4487 Y16.9382
    N555 G1 X20.1834 Y16.6499
    N560 G1 X19.9332 Y16.3485
    N565 G1 X19.6987 Y16.0346
    N570 G1 X19.4806 Y15.7092
    N575 G1 X19.2793 Y15.3731
    N580 G1 X19.0954 Y15.0271
    N585 G1 X18.9295 Y14.6723
    N590 G1 X18.7818 Y14.3094
    N595 G1 X18.6529 Y13.9394
    N600 G1 X18.543 Y13.5634
    N605 G1 X18.4525 Y13.1822
    N610 G1 X18.3815 Y12.7969
    N615 G1 X18.3302 Y12.4085
    N620 G1 X18.2989 Y12.018
    N625 G1 X18.2875 Y11.6264
    N630 G1 Y11.6
    N635 G1 X18.2975 Y11.2083
    N640 G1 X18.3276 Y10.8177
    N645 G1 X18.3775 Y10.4291
    N650 G1 X18.4471 Y10.0435
    N655 G1 X18.5364 Y9.662
    N660 G1 X18.645 Y9.2856
    N665 G1 X18.7727 Y8.9152
    N670 G1 X18.9191 Y8.5518
    N675 G1 X19.0839 Y8.1963
    N680 G1 X19.2665 Y7.8497
    N685 G1 X19.4667 Y7.5129
    N690 G1 X19.6838 Y7.1867
    N695 G1 X19.9172 Y6.8721
    N700 G1 X20.1664 Y6.5697
    N705 G1 X20.4307 Y6.2805
    N710 G1 X20.7094 Y6.0051
    N715 G1 X20.7283 Y5.9874
    N720 G1 X21.0149 Y5.7064
    N725 G1 X21.287 Y5.4116
    N730 G1 X21.5441 Y5.1035
    N735 G1 X21.7856 Y4.783
    N740 G1 X22.0108 Y4.4509
    N745 G1 X22.2191 Y4.108
    N750 G1 X22.4101 Y3.7551
    N755 G1 X22.5833 Y3.3931
    N760 G1 X22.7383 Y3.023
    N765 G1 X22.8746 Y2.6456
    N770 G1 X22.9919 Y2.2618
    N775 G1 X23.09 Y1.8727
    N780 G1 X23.1685 Y1.4792
    N785 G1 X23.2274 Y1.0823
    N790 G1 X23.2664 Y0.683
    N795 G1 X23.2854 Y0.2821
    N800 G1 X23.2875 Y0.1
    N805 G1 X23.2775 Y0.0396
    N810 G1 X23.2486 Y-0.0144
    N815 G1 X23.2038 Y-0.0562
    N820 G1 X23.1479 Y-0.0813
    N825 G1 X23.1 Y-0.0875
    N830 G1 X0.1
    N835 G0 Z0.5
    N840 M5



  2. #22
    Member
    Join Date
    May 2010
    Location
    USA
    Posts
    98
    Downloads
    0
    Uploads
    0

    Default Re: Machining arcs

    I ran this profile of lines and the attached picture is what I got. Any ideas?Machining arcs-20171012_113522-jpg



  3. #23
    Member ger21's Avatar
    Join Date
    Mar 2003
    Location
    Shelby Township
    Posts
    35538
    Downloads
    1
    Uploads
    0

    Default Re: Machining arcs

    If it's a rack and pinion machine, then something is loose.

    Gerry

    UCCNC 2017 Screenset
    [URL]http://www.thecncwoodworker.com/2017.html[/URL]

    Mach3 2010 Screenset
    [URL]http://www.thecncwoodworker.com/2010.html[/URL]

    JointCAM - CNC Dovetails & Box Joints
    [URL]http://www.g-forcecnc.com/jointcam.html[/URL]

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


  4. #24
    Member
    Join Date
    May 2010
    Location
    USA
    Posts
    98
    Downloads
    0
    Uploads
    0

    Default Re: Machining arcs

    Gerry,
    It has ballscrews on all axis, and they are an inch in diameter. The only time I seem to get this kind of 'hiccup' is at the intersection point between elements.



  5. #25
    Member ger21's Avatar
    Join Date
    Mar 2003
    Location
    Shelby Township
    Posts
    35538
    Downloads
    1
    Uploads
    0

    Default Re: Machining arcs

    Might be some WinCNC parameters then??

    Gerry

    UCCNC 2017 Screenset
    [URL]http://www.thecncwoodworker.com/2017.html[/URL]

    Mach3 2010 Screenset
    [URL]http://www.thecncwoodworker.com/2010.html[/URL]

    JointCAM - CNC Dovetails & Box Joints
    [URL]http://www.g-forcecnc.com/jointcam.html[/URL]

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)


  6. #26
    Member
    Join Date
    May 2010
    Location
    USA
    Posts
    98
    Downloads
    0
    Uploads
    0

    Default Re: Machining arcs

    Quote Originally Posted by ger21 View Post
    Might be some WinCNC parameters then??
    I think I have finally solved this and it looks like you were mostly right--WinCNC parameters in the .ini file. Here's the optimum configuration which effectively eliminates a 'bump' at the intersection of two arcs in opposing direction, in order of importance:

    1. Autoarcfeed = F70
    2. G09 = 80
    3. Spoilboard foam. I was just using foam gasketing from HomeDepot but had a conversation with the guy that runs this site: All Star Adhesives - gasketing products for CNC routers and v-groove tape for v-grooving and coving applications
    and went with a 0.25" thick foam that is put in a machined channel that is 0.19" thick, leaving 0.06" of foam exposed above the table surface. My problem is that my foam was previously a much larger distance above the table and this allows for the workpiece to move during machining, and especially during direction changes.

    Indeterminate or no effect:
    1. Acceleration = S20
    2. Arctype =T2
    3. Use the ShopSabre post-processor



Page 2 of 2 FirstFirst 12

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  


About CNCzone.com

    We are the largest and most active discussion forum for manufacturing industry. The site is 100% free to join and use, so join today!

Follow us on


Our Brands

Machining arcs

Machining arcs