[MDairheads] Exhaust Port Thread now angle

[Jim Wilson]

 *if it were mine I would grab a triangle shaped file out of the tool box
and get busy. *

As i mentioned in an earlier reply a simple hardware store file,
 ...... a Triangle file may well have the WRONG thread angle &  pitch   and
thus using one will complicate your problems and eliminate ever more
threads than you want.   you've lost enough already.    many may not know
that  a bolt makes about 60-70% contact [ depth of engagement / contact of
two mating threads, measured radially ] .
 ]  with it's mated thread when engaged.  80 Plus would be
almost impossible to thread / unthread.

screw3.gif <http://www.boltscience.com/images/screw3.gif>
80deg.gif <https://mdmetric.com/tech/80deg.gif>
thread.gif <http://www.efunda.com/designstandards/screws/images/thread.gif>
images
<https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQNpGFQZC2VUU4rxXq3MXhdXm2wsWpXyMDDwj-BXvAv532vcIYF>
WhitworthStandardThreadForm.jpg
<https://jrcengineering.com/wp-content/uploads/2016/03/WhitworthStandardThreadForm.jpg>
400px-ISO_and_UTS_Thread_Dimensions.svg.png
<https://upload.wikimedia.org/wikipedia/commons/thumb/4/4b/ISO_and_UTS_Thread_Dimensions.svg/400px-ISO_and_UTS_Thread_Dimensions.svg.png>


But here again          it's your bike and you can do what you want.




disclaimer:

*NOT* for so called guru's to read

On Wed, Aug 22, 2018 at 7:00 AM Jim McKinna via MDAirheads <
mdairheads at casano.com> wrote:

> Nicely presented.
> Complete with a couple of tips to reduce frustration.
>
> Much appreciated Bill
>
> Kevin save the job for ST and demonstrate the technique!
>
> Jim
>
> > On Aug 20, 2018, at 4:46 PM, William Lambert via MDAirheads <
> mdairheads at casano.com> wrote:
> >
> >  Looking at the picture, I agree, if it were mine I would grab a
> triangle shaped file out of the tool box and get busy.  A careful hand
> should be sufficiant for bringing definition back to the misshapen
> portions.  Neither file nor die will restore the pitch to its full major
> diameter.  But a proper shape can be restored without spending a buck.
>  All ISO Metric threads are set at 60 degrees.  Most every triangle shaped
> file on the planet is also set at 60 degrees.  Aluminum is quick to clog
> the cutting surface of a file.  A coarse single cut is best, rub chalk on
> the file first, this will help prevent it from becoming clogged with every
> stroke.
> >
> >  As Mike has mentioned, use the new nut to further caress the repaired
> threads.
> >
> > Happy fiddling.
> >
> >    Bill.
> >
> >> On Aug 20, 2018, at 1:56 PM, Mike Cecchini via MDAirheads <
> mdairheads at casano.com> wrote:
> >>
> >> Thread file works wonders......it moves metal back to where it belongs
> vs
> >> removing metal as a die does.
> >>
> >> I damaged my exhaust threads so bad I was sure they needed to be cut
> off and
> >> remachined.
> >>
> >> Called my buddy Ted Porter (The Beemer Shop) and he reminded me about
> thread
> >> files.
> >>
> >> 20 mins later I had 90% of the thread in excellent shape......right on
> the
> >> bike.....nothing else.  Done.
> >>
> >> Use lots of Nickel based anti-seize......lots......and work the exhaust
> nut ALL
> >> the way on before you put the pipe on......then go back and forth
> ......back and
> >> forth to get the anti-seize well worked into the threads.  Wipe off the
> excess
> >> and install the exhaust.
> >>
> >> Also use anti-seize on all slip-fits and nuts and bolts.  Everything
> gets
> >> anti-seize.
> >>
> >>
> >> ----- Original Message -----
> >> From: "Mark Singer
> >>
> >> I would try repairing with a thread file first, before taking a die to
> it. Be
> >> patient, slow and steady does win some races. Then if all else fails
> pay
> >> someone.
> >> Good luck
> >>
> >>
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> >
> >
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-- 

          *   Jim   *

*traveling ....... it leaves you speechless ..... then turns you into a
Storyteller  . . . . ..*