540,710 active members*
7,607 visitors online*
Register for free
IndustryArena Forum > MetalWorking > General MetalWork Discussion > Need help, milling flange thats not get round..
Results 1 to 2 of 2
  1. #1
    Join Date
    Sep 2016

    Need help, milling flange thats not get round..


    Have a problem on my job, milling a flange that are cut in half, so i milling a arc, and drill som holes. and then they put that pieces togheter and its going
    to be a nice round hole there. but it aint,.. in one side the measure is 414 , (CORRECT MEASUREMENT) and in other axis it is 412.7 (WRONG)
    but the measurement is good between all holes.

    i have drawed a quick pic how i mean..

    It milling with a 63mm milling tool with i think 12 plates.. the job is 35mm height, i put in some lines from prog.

    we remove 4mm in radiell (ae)

    G43 H2 Z-14 S.... M3
    G0 X-175.5 Y50
    G1 Y0 F...
    G3 X175.5 R175.5
    G1 Y10.
    G0 Z10
    X-175.5 Y50
    G1 Y0
    G3 X-175.5 R175.5

    We take out the Y0 at the "ears" and then move it down -3MM becuse we have 3mm from plasma cutting to remove too..
    X0 is in the middle of the arc.


    Best regards.

  2. #2
    Join Date
    Mar 2008

    Re: Need help, milling flange thats not get round..

    A couple things could be going on. One is back lash in the machine. The other cause may be the part spread open with all that material removed and heat from the plasma. What i would do is drill the holes first. Then screw through the holes to a fixture plate. Then cut the outside. If it is still off then check for back lash and make sure you are actually measuring to the center of the arc correctly.

Similar Threads

  1. Help Milling Round Mould
    By rzeni in forum Milling
    Replies: 1
    Last Post: 07-10-2019, 10:45 AM
  2. Newbie Here.. trying to make a shaft flange on milling machine need help
    By truckeic in forum General MetalWork Discussion
    Replies: 16
    Last Post: 09-01-2016, 06:13 PM
  3. G0704 milling pockets out of round? Help please
    By abond13 in forum Benchtop Machines
    Replies: 31
    Last Post: 05-06-2015, 01:35 AM
  4. Help milling exhaust flange
    By pauls in forum Uncategorised MetalWorking Machines
    Replies: 5
    Last Post: 12-31-2007, 01:42 PM
  5. Macro for milling round bar
    By sencinia in forum General MetalWork Discussion
    Replies: 0
    Last Post: 03-31-2007, 04:58 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts