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IndustryArena Forum > MetalWorking Machines > Daewoo/Doosan > Offset Diameter Cam Turning/Milling on Lynx 2100
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  1. #1
    Member
    Join Date
    Jul 2019
    Posts
    3

    Post Offset Diameter Cam Turning/Milling on Lynx 2100

    Hello, Anybody got some Ideas on this?

    I am having trouble programming a .250" offset 1.5" +-.006 Dia on 2" OD, on our just purchase Doosan Lynx 2100LYA. Getting .07" out of round. I am trying to do this with a vertical 1/2 endmill with a R.03.
    The E-Z I software on the control wants me to do it as a live tool face, but with the tail stock and clamping less than 3/8" deep on a hex and my offest diameter starts at -1.625 and finishes at -2.875" , it rules that out as a possibility.

    The strange part is I use a 1/2 Ballnose endmill and i am getting .030" out of round, I tried using a 1/4" 90 degree point endmill and its only out .002" Tried a CMNG insert and turning it, comes out perfectly round too, but taking out all that material, I am only pushing 1/8" DOC and .005 stepover, I am pushing the head as fast as it rotates but it takes a lot of time, as I am doing a lot of these pieces.
    I also tried mucking about changing the rad in the program but if I increase or decrease it, I get some pretty cool egg shaped designs.
    It's like I almost have to program some kind of tip comp in.

    Also included a pic of what I am trying


    I got a program off this forums and modified the diameters.

    O1338(OFFSET MILL)
    G54 G40 G00 X13.6 Y0 Z10.0
    G00 T020 2M03
    G97 S2600 P12 M35
    G00C0
    M8
    X2.1 Z0.25
    G50 C0.
    G1 G98 X2.0 Z0.0 C0.0F20.
    G112
    M98 P1337 L125
    G113
    G0X4.Z2.M9
    G40G00 X13.6 Y0 Z10.0 T0000
    M05 P12
    M30

    Sub Program 1337
    O1337
    G2X-1.0 C0. R0.75 W-0.01 F20.
    X2.0 C0.0 R0.75 F20.
    M99

    Thanks for any input, as I am new to programming lathes, and my company decided I'll be the one they throw in head first to learn it.
    Attached Thumbnails Attached Thumbnails IMG_6276.JPG  

  2. #2
    Member
    Join Date
    Jul 2005
    Posts
    314

    Re: Offset Diameter Cam Turning/Milling on Lynx 2100

    Do you have the classroom manual?
    I wrote them way back when I worked for Doosan, and I'd be glad to send you a copy.

  3. #3
    Member
    Join Date
    Jul 2019
    Posts
    3
    No I don't I just have the ones that shipped with the machine and what is on the flash drive. Thanks for the help.

  4. #4
    Member
    Join Date
    Jul 2005
    Posts
    314

    Re: Offset Diameter Cam Turning/Milling on Lynx 2100

    It's my pleasure. PM me

  5. #5
    Member
    Join Date
    Jul 2019
    Posts
    3
    Figured it out, kinda hard to do manually, The cutter either cuts on the front or back tip, which throws me out of round. Got a buddy to post out something for me. I'll share it if anyone wants it for reference.


    X1.4768 Z-0.4453 F72.0
    X1.477 Z-0.448
    X1.4571 C-4682.286 F3600.0
    X1.4353 C-4684.819
    X1.4211 C-4686.523
    X1.3917 C-4689.988
    X1.37 C-4692.628
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    X1.2905 C-4702.675
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    X1.4788 Z-0.498 F72.0
    X1.459 C-5042.292 F3600.0
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    X1.4888 C-5398.901
    X1.4788 C-5400.0

  6. #6
    Member
    Join Date
    Jul 2005
    Posts
    314

    Re: Offset Diameter Cam Turning/Milling on Lynx 2100

    Zounds!
    You could use Polar Interpolation - G12.1...

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