1. #1
    Wal's Avatar
    Lives in Stockport, United Kingdom. Last Activity: 17-02-2019 Has been a member for 6-7 years. Has a total post count of 404. Received thanks 45 times, giving thanks to others 20 times.
    Hi all,

    I've recently dipped my toe into F360 for a bit of simple modelling and CAM. It's got a few oddities, but by and large I'm very happy - it's kinda like having a new machine..!

    There's one thing that happens which I can't quite get me head around. Here's the short version of what's going on:

    1. Open LinuxCNC, home it (G53) then set workpiece origins (G54)
    2. Load code generated in F360 and run code to find that Z axis hasn't cut down as far as it should have
    3. Recheck Z zero position, it's slightly higher than what I zeroed it as (0.5mm)
    4. Re zero my Z position and run the program again without re-loading it
    5. Position of Z axis remains correct throughout


    Now, when I load a program immediately afterwards that's been written by VCARVE, the reverse is true - ie. that program wants to cut down 0.5mm more.

    Weird huh..?

    Here's the pre-amble to an example of the g-code I'm outputting from F360:


    %
    (FSS)
    (T1 D=4. CR=0. - ZMIN=-18. - FLAT END MILL)
    N10 G90 G94 G17 G91.1
    N15 G21
    N20 G28 G91 Z0.
    N25 G90
    (ADAPTIVE1)
    N30 M9
    N35 T1 M6
    N40 S10000 M3
    N45 G54
    N50 G0 X-17.892 Y-22.049
    N55 G43 Z15. H1
    N60 G0 Z5.
    N65 Z-4.2
    N70 G1 Z-4.6 F960.

    I've tried this with the G28 Safe Retracts command both enabled and disabled - the only discernable difference is that with the G28 enabled there's a slight pause following the final retract before the machine retracts fully to the G53 zero.

    Any ideas?

    Wal.
    Last edited by Wal; 26-01-2019 at 09:34 PM.

  2. #2
    Wal Have you tried using a G49 tool length cancel in the preamble N10 G90 G94 G17 G91.1
    ..Clive
    The more you know, The better you know, How little you know

  3. #3
    Wal's Avatar
    Lives in Stockport, United Kingdom. Last Activity: 17-02-2019 Has been a member for 6-7 years. Has a total post count of 404. Received thanks 45 times, giving thanks to others 20 times.
    Hi Clive - just got in. Will try this as soon as I'm able. Will give you a call tomorrow.

    Wal.

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