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  1. #1
    Join Date
    Dec 2006
    Posts
    532

    having problem with a part im cutting

    Hi, i'm new user of mach3 my friend purchased old bridgeport that was already retrofitted, with mach on there.

    What i'm working on is first project, exhaust flange. I made part in solidworks, exproted dxf, used lazycam to make inside and outside offsets and into the mach3. Below are few pictures to explain what i'm doing and what i'm getting. I have only tried cutting outside chain, and big inside circle. Also attaching dxf and g code that i'm getting from lazycam.

    1. What part supposed to look like:




    2. How part looks when its cut:
    Attached Files Attached Files

  2. #2
    Join Date
    Jun 2003
    Posts
    2103
    rustamd zip your gcode file and post it and I will run it through my Mach system and see what I get.

    Mike
    No greater love can a man have than this, that he give his life for a friend.

  3. #3
    Join Date
    Dec 2006
    Posts
    532
    N10 (File Name = Exhaust clamp on Wednesday, September 19, 2007)
    N20 (Default Mill Post)
    N30 G91.1
    N40 G0 Z1.0000
    N50 M3
    N60 X1.8430 Y0.3897
    N70 Z0.1000
    N80 G1 Z0.0000 F60.00
    N90 G2 I-0.1969 J0.0000
    N100 G0 Z1.0000
    N110 X1.8430 Y4.1397
    N120 Z0.1000
    N130 G1 Z0.0000
    N140 G2 I-0.1969 J0.0000
    N150 G0
    N160 X0.0337 Y2.9549
    N170 Z0.1000
    N180 G1 Z0.0000 F1.00
    N190 X1.0867 Y4.4291 F4.00
    N200 G2 X2.2056 Y4.4291 I0.5595 J-0.3996
    N210 G1 X3.2585 Y2.9551
    N220 G2 Y1.5744 I-0.9664 J-0.6903
    N230 G1 X2.2055 Y0.1004
    N240 G2 X1.0867 Y0.1004 I-0.5594 J0.3996
    N250 G1 X0.0337 Y1.5746
    N260 G2 X0.0337 Y2.9549 I0.9663 J0.6902
    N270 G0
    N280 X2.4587 Y2.2648
    N290 Z0.1000
    N300 G1 Z0.0000 F1.00
    N310 G2 I-0.8125 J0.0000 F4.00
    N320 G0 Z0.0000
    N330 M5
    N340 M30


    i'm cutting with 3/8" end mill, if that mattes(thats what lazycam knows also),so my question is, can anyone help me figure out what is my promlem? Thanks

  4. #4
    Join Date
    Apr 2005
    Posts
    3634
    It plots good with NcPlot.


    .
    Attached Thumbnails Attached Thumbnails 1.jpg  

  5. #5
    Join Date
    Dec 2006
    Posts
    532
    yea, it looks ok on mach3 toolpath screen, just when i cut test peice in aluminum it didnt come out as nice...

  6. #6
    Join Date
    Dec 2006
    Posts
    532
    anyone else has any ideas?

  7. #7
    Join Date
    Jun 2003
    Posts
    2103
    Is this machine stepper or servo? It almost looks like steps lost?????

    Mike
    No greater love can a man have than this, that he give his life for a friend.

  8. #8
    Join Date
    Dec 2006
    Posts
    532
    stepper. i dont know what lost steps look like, never had them. as far as i know...

  9. #9
    Join Date
    Feb 2007
    Posts
    464
    I ran it on "CNC simulator" and it looks good.
    I think your machine is missing something.

  10. #10
    Join Date
    Nov 2005
    Posts
    655
    I noticed that the first two holes are cut at a F60.00 and the rest of the part at F4.0. What is the material? What RPM? Tool material?

    Crash at N160 and N280: Rapid move in the X and Y before the Z is out of the part. (Edit) lines N150 and N270, add Z1.0000 to those lines.

    Change Z on line N320 to Z1.0000

    It's been along time but, I think I'm seeing that right.

    Cheers,
    Jack
    Walking is highly over-rated

  11. #11
    Join Date
    Aug 2007
    Posts
    215
    My guess is that you're losing steps on Y rapids (at least on -ve Y rapids). lower your rapids and see if that sorts it.

    EDIT: nice one tauntdesigns - missed that. rustamd - ignore my post

  12. #12
    Join Date
    Dec 2006
    Posts
    532
    Machine is only two axis at the moment(i add m06 before each z movement, than adjust quill by hand). Right now i'm just cutting aluminum(to make sure it does it correctly) but after it works it going to be cut in 304 stainless steel with 4 flute HSS end mill.

    I was going to cut it at ~900rpm and 1-2ipm.

  13. #13
    Join Date
    Nov 2005
    Posts
    655
    I see, I thought there should have been a bigger crash then you were talking about.
    I check into what stirling said, slow down mach's rapid moves.
    Walking is highly over-rated

  14. #14
    Join Date
    Dec 2006
    Posts
    532
    will do, but need to figure out whats the deal with controller, it blew a fuse yeasterday, and i want to find out from what...

  15. #15
    Join Date
    Dec 2006
    Posts
    532
    will not be able to update on this issue becouse power supply went out for controller, probably will take few weeks to get this done.

  16. #16
    Join Date
    Dec 2006
    Posts
    532
    well after the power supply was replaced, i reduced the rapid speed by 15% and cut the part again and it came out just like it was supposed to. Thanks for the help!

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