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Thread: Tool and Work Offset Errors

  1. #21
    Member mountaindew's Avatar
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    Default Re: Tool and Work Offset Errors

    Quote Originally Posted by jwatte View Post
    Your part will absolutely expand by the coefficient of expansion times the delta in temperature.
    This is why industry standard tolerance for machine shops is 0.005" and anything better starts costing more (and the better-er, the more-er!)
    Very high precision parts come with QC schedules that specify inspection climate.
    Very high precision mills and lathes come with built-in heaters/chillers for all the important parts. (Check out John Saunders' factory visit with the Kern Pyramid for some over-the-top precision stuff!)

    Physics is physics. Might as well try to fight death, or taxes!
    Kern makes some nice tool systems. 50+ pallets 100+ tool changer with separated modules. auto probe for parts on all those pallets. Talk about crazy programs that could make hundreds of different parts all in one program. Hit start one day and it finishes 3days later



  2. #22
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    Default Re: Tool and Work Offset Errors

    The ones I'm using are Omron Z-15HQ22-B which claim to repeat to better than 0.001". We'll see how that works out!
    https://www.digikey.com/en/products/...HQ22-B/1829815



  3. #23
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    Default Re: Tool and Work Offset Errors

    Thanks! Please let us know if they actually improve homing accuracy.

    If one considers that the switch is actuated using an inclined plane, 0.001 of switch plunger travel is 2-3 thou of table travel so I don't have high hopes. I wonder if anyone has used an encoder on the ball screw for homing. I realize that I could upgrade to a 770MX but...



  4. #24
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    Default Re: Tool and Work Offset Errors

    Quote Originally Posted by kstrauss View Post
    Thanks! Please let us know if they actually improve homing accuracy.

    If one considers that the switch is actuated using an inclined plane, 0.001 of switch plunger travel is 2-3 thou of table travel so I don't have high hopes. I wonder if anyone has used an encoder on the ball screw for homing. I realize that I could upgrade to a 770MX but...
    Right Ken, I was thinking the same thing.

    Last edited by popspipes; 04-30-2021 at 08:39 PM.
    mike sr


  5. #25

    Default Re: Tool and Work Offset Errors

    Thanks Cliff, this has cleared up some issues I have been seeing....it is all very obvious now. I though a probe would fix all my variances...I was wrong, now I get it.



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