Re: Minarelli Flywheel Puller

Allen Murphy /
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Measure the I.D or the threaded hole, which will give you the minor diameter of the hole.

Now--take some modeling clay and press it into the threads , and on the clay, measure the pitch with a metric dial indicator.

Or, easier yet, take a thread gauge and measure the pitch.

Now, go to a copy of Machinery's handbook and look up the depth of the cut, i.e, root depth.

Now the easy part--minor diameter + 2 times root depth = major diameter.

Lathe turn and thread accordingly.

Al Murphy

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