1. #1
    Hi guys

    I've not posted here a lot as I've only just started to learn a machine I bought back in June. Alas. at work I'm a heidenhan guy, but have worked with fanuc up until a decade ago. My machine uses Mach 3 and last night was the 1st time I cut metal. When I shut the program down, it asked me to save fixture data, which I assumed was the datums I had set on my job. Upon firing up today, it had lost position, so I had to reset them, any ideas why?

    Next, I'm doing a bore with a 6mm cutter, the data is in the tool page. I go down, comp on in Y, circular interpolate, spring cut, then comp off. It's a 19mm bore.

    This is my program:

    G91
    G1 G41 D1 Y9.5 F100
    G3 J-9.5
    G3 J-9.5 (spring cut)
    G1 G40 X0. Y-9.5 F500
    G90
    G0 Z2.

    However, when comping on it moves in X, and the final Y pos in Y once comped on is 8.49something, wtf, when it should be 6.5. Then, despite my datums being set correctly, the circle is off centre (my datums are in the circle centre).

    Would anyone have an idea what I've not set correctly, or what I've forgotten/not done? I'm new to this home machine lark so any help would be greatly apprec'd.

    Ta
    RC
    Motorbikes
    Being chained to the bed
    Twatter: @CrazyLThirteen
    Insta: CrazyLThirteen

  2. #2
    Quote Originally Posted by Crazy L View Post
    When I shut the program down, it asked me to save fixture data, which I assumed was the datums I had set on my job. Upon firing up today, it had lost position, so I had to reset them, any ideas why?
    It doesn't work in all versions, I always park it in a known place.

    Can't help with the code, I apply my cutter comp in CAM and it works OK.

    - Nick
    You think that's too expensive? You're not a Model Engineer are you? :D

  3. #3
    Quote Originally Posted by magicniner View Post
    It doesn't work in all versions, I always park it in a known place.
    Ah, like a park position on an old Interact, good idea, I didn't think of that. Learning curve and all that.
    OK, I didn't know that either, perhaps y version is an old one or something. Thank you very much.

    Got round the circular pocket issue for now. I found if I used centre line of cutter rather than comping on, it works.
    RC
    Motorbikes
    Being chained to the bed
    Twatter: @CrazyLThirteen
    Insta: CrazyLThirteen

  4. #4
    I've not posted here a lot as I've only just started to learn a machine I bought back in June. Alas. at work I'm a heidenhan guy, but have worked with fanuc up until a decade ago. My machine uses Mach 3 and last night was the 1st time I cut metal. When I shut the program down, it asked me to save fixture data, which I assumed was the datums I had set on my job. Upon firing up today, it had lost position, so I had to reset them, any ideas why?
    Did you re home the machine on switch on first.
    Last edited by Clive S; 10-09-2017 at 07:19 PM.
    ..Clive
    The more you know, The better you know, How little you know

  5. #5
    Quote Originally Posted by Clive S View Post
    Did you re home the re machine on switch on first.
    Hi Clive

    Y'know, I don't actually remember for sure. Although thinking about it now, I think I did reference it, yes. then watched in dismay as the readout changed, lol.
    RC
    Motorbikes
    Being chained to the bed
    Twatter: @CrazyLThirteen
    Insta: CrazyLThirteen

  6. #6
    Have a look at this Screenset; http://www.thecncwoodworker.com/2010.html
    I find it makes setting zero and using fixtures so much easier.
    Spelling mistakes are not intentional, I only seem to see them some time after I've posted

  7. #7
    Ta EddyCurrent

    I'll have to find out what version I'm running as I have no idea.
    RC
    Motorbikes
    Being chained to the bed
    Twatter: @CrazyLThirteen
    Insta: CrazyLThirteen

  8. #8
    Ger21's Avatar
    Lives in Detroit, United States. Last Activity: 6 Hours Ago Has been a member for 6-7 years. Has a total post count of 573. Received thanks 80 times, giving thanks to others 0 times. Referred 1 members to the community.
    To use comp in a circle like that, you need a lead in and lead out move. And different versions of Mach3 may require different lead in moves, as the comp was changed at one point.
    Gerry
    ______________________________________________
    UCCNC 2017 Screenset

    Mach3 2010 Screenset

    JointCAM - CAM for Woodworking Joints

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