On Tue, 26 Oct 2004 23:19:55 -0500, A Muzi <
[email protected]>
wrote:
>meb wrote:
>
>> Swapping out pedals recently, I’ve destroyed the pedal threads on a left
>> crank and visibly damaged the threads half the length on another that
>> seems to be holding fine.
>>
>> I know they make LH pedal taps, but wonder if upon destroying the
>> threads if there typically is enough thread left to merit re-threading
>> with a tap on aluminum cranks.
>
>Left arms are usually replaced as they cost less than the
>service in most cases.
>But indeed a tap might clear slight thread damage. If the
>arm must be re-used a steel insert or a helicoil may be set
>in it. Find someone experienced in this work and ask
>his/her advice.
9/16x20 is not a Helicoil size that is supplied as an item available
from stock Time-Sert also doesn't supply that size as a stock item.
It might be possible to get them on special order, but it would be
likely to be costly. OTOH, a threaded bushing could be made and
inserted by a number of means; one is simply to tap the hole for a
much larger thread (probably 3/4" NF or 18x1.5mm), cut off a piece of
threaded stock of that size, run it into the hole, pin it in place,
and then drill and tap it to size. This would only work on a crank
that had sufficient meat around the bore to leave it sound after the
rethreading. I've used similar tactics in machinery repairs a few
times; done well, in an appropriate situation, it's a durable and
permanent fix.
--
Typoes are a feature, not a bug.
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