Smoothing Broaches, making your own •

Discussion in 'Hints & How-to's' started by Jay Fortner, Feb 6, 2014.

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  1. Jay Fortner

    Jay Fortner Registered User

    Feb 5, 2011
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    #1 Jay Fortner, Feb 6, 2014
    Last edited by a moderator: Nov 29, 2014
    Here's how I make my own smooth broaches;
    Start off with a piece of hardened pivot wire in the size range of the hole you're broaching.

    clock tech 303.jpg

    Chuck it in a drill and hold it against the side of a spinning grinding wheel at a very slight angle,less than 1deg(1 deg=.0175 per inch taper).

    clock tech 305.jpg

    Using progressively finer sand paper run the drill and smooth the grinding marks while maintaining a crosshatch pattern on the broach,if a little cutting action is desired stop at the coarser grit paper.

    clock tech 306.jpg
    clock tech 309.jpg
    This is what your finished broach should look like. The camera didn't pick up the crosshatching very well but it's there.

    clock tech 308.jpg
  2. bangster

    bangster Moderator
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    Jan 1, 2005
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