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    Smaller or Larger?

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    Stonedog
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    Smaller or Larger?

    Post by Stonedog on Tue Apr 02, 2013 4:32 pm

    OK, I have my tiller roughed out nicely and the nut mortise nicely done.

    Here is my dilemma:

    I used my 1 1/2" forstner bit for the nut mortise....and I am using a 1 1/2" diameter Delrin nut....so the mortise and the nut are the exact same size. This is problematic as we all know...

    So, I am at a cross roads....I can either make the mortise larger, which honestly makes me a bit uncomfortable as it is done so well.....

    OR

    I can slowly rotate the nut in 220 sandpaper until is just fits and rotates freely in the mortise...

    Thoughts? Ideas?

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    Regeis
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    Re: Smaller or Larger?

    Post by Regeis on Tue Apr 02, 2013 4:52 pm

    Delrin's not going to sand anywhere near as nicely as the wood... I'd increase the size of the hole. Get a dowel, glue a 'flap' of sandpaper around it, stick it into the chuck of your drill and use it to gradually widen the gap?
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    mac
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    Re: Smaller or Larger?

    Post by mac on Tue Apr 02, 2013 5:13 pm

    Stone,

    You did not say that you have actually tried putting the nut into the mortice. Have you tried it, or is the problem still theoretical.

    If you do have to remove material, It would be more accurate to remove it from the nut if you can have a way of turning it on its axis.

    If you had to take it out of the mortice, you would want to wrap some sandpaper around a dowel that nearly fir the mortice. That way the action of the abrasive would be more or less evenly applied to the circumference.

    Mac

    Stonedog
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    Re: Smaller or Larger?

    Post by Stonedog on Tue Apr 02, 2013 5:17 pm

    Yes....I tried a trial fit (now that is a clunky bit of sentence!) and it simply is WAY too tight....

    I am also a fan of hand tools for delicate jobs...

    If I was to slowly to sand the delrin (I am staining it later) will it still be safe to use say if it is 1/16" less in diameter.

    I am not looking to do it quickly...only accurately and well done!
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    mac
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    Re: Smaller or Larger?

    Post by mac on Tue Apr 02, 2013 5:34 pm

    I would shoot for closer tolerance than 1/16". Start with 1/64". You can always take more away if you have to, but you can't put it back on.

    Mac
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    Re: Smaller or Larger?

    Post by kenh on Tue Apr 02, 2013 6:11 pm

    Yes it will be safe to use; it's the depth of the notches that count for safety. But I agree - just take a teenie tiny bit off - 1/64th. If it were me, I'd wrap the nut in a piece of 2000 grit sand paper (rough side out) and turningly work the nut back in the mortise.

    I'm not sure that Delrin will stain...

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