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quot;It feels rightquot; metrics

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  • #65838

    Stephens
    Participant

    > You can’t use any torque gauges because it requires thumping a handle into the right position, not a gradual force of pressure. If you need to bang the handle until your hand hurts, then the collet is too tight.

    Hi Terry,

    Is it possible to remove the handle and retrofit a new type of handle that would allow you to apply an exact amount of pressure (via electrical or pneumatic power) to tight the collet? I’ve found in other areas that poka yoke’ing it (mistake proofing) can pay off enormously and you can receive payback for the cost to implement within 6 months.

    What do you think?

    Craig

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    #27066

    Terry
    Member

    I’m working on a project involving tightening collets on screw machines. If a collet is too tight or loose it causes severe unplanned maintenance problems. The set up guy has shown me the difference between too tight or loose, and just right. He has taught me to tighten the collet correctly. It’s almost like a machinist’s skill, vs a discrete setting. I’m trying to quantify what “just right” is for everyone else. You can’t use any torque gauges because it requires thumping a handle into the right position, not a gradual force of pressure. If you need to bang the handle until your hand hurts, then the collet is too tight.

    Does anyone have any experience with machining or similar gaging/set-up situations that are similar in nature. I would appreciate any insights on how you might handle this one.

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    #65845

    keyes
    Participant

    Hi Terry,

    Where I used to work, we had a similar situation with the timing adjustments on some of our machines.

    What we did was simply engrave a line on the sleeve and tightening nut. It was the easiest way to ensure that the nut was always set in the same place as we used to fit a device and hit it with a hammer to tighten it. This was completed in this way as a torque wrench could not be used within the confined space.

    I know it sounds barbaric but it worked for us and we never had a problem.

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    #65856

    Broomfield
    Participant

    Hi Terry
    To follow up with the suggestions presented so far, can you adapt a “handle” (hollow steel tube for example)to extend the leverage? Even if cut & mitered 180 degrees, it should still work.
    You could then attach a strain gage to the lever which will yield the continuous data you need.

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