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IndustryArena Forum > MetalWorking Machines > Sharp CNC > Need thread cutting help

Thread: Need thread cutting help

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  1. 03-05-2008, 05:00 PM #1
    Larry Myers
    Larry Myers is offline Registered
    Join Date
    Jul 2007
    Posts
    59

    Need thread cutting help

    Hi all,
    I posted this in the G-Code section as well.
    I am looking for some advise concerning internal thread milling. I have a Sharp 2412 VMC. Fanuc oi.
    I am wanting to thread a 1”-8 hole, 1” deep. (aluminum) I have the hole already bored out to 7/8”.
    I have a 6 flute single point carbide bit that is 0.695” dia. I wasn’t going to use cutter comp to begin with. Below is the part of the program that I am having trouble with:

    T4M06(THREAD MILL);
    G00G17G20G40G80G90;
    G54X0Y0M03S1000;
    M08;
    G43H4Z0.1;
    G01Z-1.0F20.;
    X0.150F10.;
    G91G03X0.15Y0I0.15Z0.125F10.L10;
    G01X0Y0M09;
    M05;
    G00G28G91Z0;
    M30;
    %

    I think my problem is in the feedrate however I am not sure what to do. Thanks in advance for any help!

    Larry
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  2. 03-08-2008, 06:26 PM #2
    samdog
    samdog is offline Registered
    Join Date
    Mar 2008
    Posts
    6
    use i and j and start from bottom of hole and bring tthe z up in 1/2 truns
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