[CR]Tapping Crank Pedal Threads


Date: Sun, 09 Mar 2003 15:55:28 -0600
From: Velostuf <jb@velostuf.com>
To: Classic Rendezvous <classicrendezvous@bikelist.org>
Subject: [CR]Tapping Crank Pedal Threads

Jay-

I noticed your post about re-tapping your cranks.

I am not an authority with this, I've only done it once, but: By all means, go ahead and do it, but it's important that the tap go in straight. What I did was to go to my friends place, because he has a nice drill press. I then carefully clamped the crankarm to the table below the chuck, which puts it perfectly perpendicular. Then, I clamped the tap into the chuck, had an assistant lower it towards the crankarm, and then I gripped the big, knurled chuck, and turned it slowly into the smaller French threads, (Don't even think of turning the drill press on!!) Even though English and French pedal threads are pretty close in size, it's surprisingly tough to tap the new threads using this method. Remember to back out the tap every once in a while to break off the pieces that are freshly cut. Also, use plenty of light oil...

John Barron
Minneapolis