Looking for somebody whop can Lap LARGE parts. 21" dia.
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  1. #1
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    Default Looking for somebody whop can Lap LARGE parts. 21" dia.

    Per the title on the thread. We have a request where a customer is looking for .750 thick x 21" dia.

    Tolerance is +/- .00004". 1 micron.

    Hardened tool steel material, mid 50 rockwell C- Scale.

    No specific finish.

    I could grind down to hold a size/flat parallel to within +/-.0001".

    If you can do this or know somebody just PM me.

    Thank you in advance.
    Last edited by cash; 12-03-2018 at 07:38 PM.

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    You don't specify material.

    Could a surface plate calibrating company do the job? They have the means to inspect the job when done.

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    Updated for material- thanks for bringing this up.

    Really needs to be done on a proper lapping machine. Somebody who laps can inspect to this tolerance. I have the equipment to verify.

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    How about manufacturers of large lens and mirrors.

    Tom

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    Spec doesn't make sense to me. The material is only 3/4" thick. It's much too floppy to stay flat unless attached to a support structure. To hold this flatness in metal, you need a ribbed supporting structure like a 2' x 2' cast iron surface plate.

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    Yes- for the use this is a crazy tolerance, but what our customer requests.

    The parts are supported and so they way they are used the tolerance is more for size that flat.

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    Have you tried Ryeco in Beloit? I'm not sure if they can, but they may be able to.

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    Quote Originally Posted by AARONT View Post
    Have you tried Ryeco in Beloit? I'm not sure if they can, but they may be able to.
    They have a Stahli Finegrinder, which they describe as a "flat honing machine". This might be appropriate (over a double-disk grinder) for the target size/tolerance. It looks big enough, would be worth a call.

    Ryeco, Inc. - Double Disc Grinding Specialists - Grinding

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