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  1. #31
    Just thought I'd put my model with a few dimensions just to show how far out the machine is.

    Click image for larger version. 

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  2. #32
    Hi Anstals,

    As you are using ballscrews you should have negligible backlash so i don't think that is you're problem.

    Looking at the finish on the part I'd say you have play in the jibs X &/or Y or the Z column could have excessive play in the housing.

    Have you checked the amount of backlash you have "Do you know how" ?

    Phil

  3. #33
    Phil,
    Thanks for the reply......no I need some guidence on how to check for backlash. Thats a good call on the jibs, I need to check them all I'm guessing they are tight enough when there is no movement?

    Cheers
    Ant

  4. #34
    Hi Ant,

    To adjust the jibs It's best to take the motors off so you can turn the ball screws by hand you can then FEEL for any binding so get them as snug as you can but no binding. The best place to do this is at the extremes of travel as this will be the tightest area.

    To test for backlash you need to have a DTI in a chuck or collet

    You gently come up to a smooth face zero the DTI and zero the DRO

    YOU CONTINUE TO WIND THE DTI ONTO THE FACE A SMALL AMOUNT 0.2mm say

    Then you gently back off the face until the DTI reads zero

    Your Backlash will be what the DRO reads

    Wind the Z down about 75mm put a dowel in a collet chuck have the dowel sticking out 30mm put the DTI on the dowel at It's end push and pull on the collet chuck to measure play in the quill/housing.

    Phil

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