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IndustryArena Forum > MetalWorking Machines > Okuma > Toolchange/offset does not work (with video)
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  1. #1
    Join Date
    Oct 2005
    Posts
    332

    Toolchange/offset does not work (with video)

    After a very long time in a Okuma osp100 trying to get a basic issue to work, we decided to stop and ask for help.

    What happens is that issuing a tool change with different offsets, the position does not change (the relative position).
    We are making for sure something wrong, but we cannot find what. In the video we go to the tool table, change the X and Z of tool number 1 and number 2.

    You can see that I set:
    tool1 X0 Z0
    tool2 X55 Z20

    Then we call the tool, the disk rotates (so I assume the control should update the DRO) but still the same DRO in both cases (X=469.907 Z=113.443), so a basic step is not correctly being done, what is?

    [ame=http://www.youtube.com/watch?v=gb4xtPYzx1Q]okuma - YouTube[/ame]

    Thank you

  2. #2
    Join Date
    May 2004
    Posts
    4519
    Does it change after a tool call and then a machine move call?

  3. #3
    Join Date
    Mar 2009
    Posts
    1982
    it's Okuma logic.
    You use a line
    G90 G00 X100 Z20 T010101
    in normal use of Okuma lathe. brief explanation:
    Suppose, the turret is in tool change position. After this line tool #1 goes to point X100 Z20 according actual zero offset (shift)
    You try this:
    G91 G00 X0 Z0 T010101
    this means "tool #1 goes from present point to distance =0"
    the turret doesn't moves. work coordinate will change instantly as You wish to be

  4. #4
    Join Date
    Oct 2005
    Posts
    332
    Thank to both.
    Will try. Should be it as I had no error, just no DRO update.
    Thank you

  5. #5
    Join Date
    Oct 2011
    Posts
    39
    After watching the video. You are doing the right thing but it is only changing the tool position on the turret to the tool selected.

    T010101 (tool position #1)
    T020202 (tool position #2)

    I would try this code to see if the offset is working

    M21 (Tailstock Barrier ON or spindle interference monitoring ON)
    M25 (Chuck Barrier ON, Tool interference ON)
    G00 X_._ (home position) Z_._ (home position)
    G50 S2500

    G97 S500 M41(Low Speed) M04(rotation) M08(coolant on)
    G00 X_._ (Desired position) Z_._ (Desired position) T010101 (Tool #1)
    G01 X_._ (desired position) Z_._ (desired position) F_.__ (Feed Rate)
    M05 (Spindale Stop)
    M09 (Coolant Stop)
    G00 X_._ (home position) Z_._ (home position) T0100
    M01 (optional Stop)
    NAT02
    G97 S500 M41(Low Speed) M04(rotation) M08(coolant on)
    G00 X_._ (Desired position) Z_._ (Desired position) T02010 (Tool #1 but offset #2)
    G01 X_._ (desired position) Z_._ (desired position) F_.__ (Feed Rate)
    M05 (Spindale Stop)
    M09 (Coolant Stop)
    G00 X_._ (home position) Z_._ (home position) T0100
    M20 (Tailstock Barrier ON or spindle interference monitoring off)
    M24 (Chuck Barrier ON, Tool interference Off)
    M02(Program Stop)


    Thanks
    Chris

  6. #6
    Join Date
    Oct 2005
    Posts
    332
    It was solved, this is, I was not doing nothing wrong. The machine needed a commanded position for updating the DRO, so after Algirdas and txcncman it was clear.

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