thread size for rear shock tube.

PostPost by: ngiovas » Sat Jul 23, 2005 11:49 pm

Having just answered a question about rear shocks, I have one of my
own. Does anyone know what the size/thread is on the top of the rear
shock tube? I am ready to put my new inserts in, but it looks like
the lip of one of the tubes has a small amount of damage to the
threads and I can't get the new shock cap to thread into the tube.

I'm not sure if I could even find a tap or other thread repair tool
that size. Is there another way of fixing the lip of the tube so that
I can get the cap threaded into it? I know the cap is the correct
size because it goes right into the other tube. I can see the spot on
the lip where it appears that a couple of the threads are rounded in
one spot.

Thanks in advance for your help.

Nick
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PostPost by: Carl Zahler » Sun Jul 24, 2005 2:34 am

Not sure where to find them, but there are thread chasing files. They
have "ridges", with file teeth, that match the number of threads per
inch or metric equivalent. You need to get one that is correct for that
thread pitch (No. I don't know what it is). These are then used to
remove burrs from the threads.

Not sure where to find them. Try a shop that caters to machinists or
tool and die people.

CZ

ngiovas wrote:


--
Carl H. Zahler
***@***.***
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PostPost by: nebogipfel » Sun Jul 24, 2005 12:09 pm

--- In ***@***.***, "ngiovas" <64_elan@g...> wrote:
"I can see the spot on the lip where it appears that a couple of the
threads are rounded in one spot."

Nick, If the thread is only damaged in a small area as you suggest it
should be possible to "chase out" the surplus material with a good hard
bit of steel - the edge of a small sharp file would probably do it.
You would have to use a scraping action.

You could then use the old shock retainer to clean the thread before
you use the new one. Plenty of copaslip or similar would help

John
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PostPost by: ngiovas » Sun Jul 24, 2005 3:06 pm

Thanks. I think that will work. It is just a very small section of the
first thread or so that is damaged and is preventing the cap from getting
started. It feels like it is going to catch, but then when it hits that
section the cap starts to tilt and pops out.

-----Original Message-----
From: ***@***.***lto:***@***.*** Behalf
Of nebogipfel2004
Sent: Sunday, July 24, 2005 8:09 AM
To: ***@***.***
Subject: [LotusElan.net] Re: thread size for rear shock tube.

--- In ***@***.***, "ngiovas" <64_elan@g...> wrote:
"I can see the spot on the lip where it appears that a couple of the
threads are rounded in one spot."

Nick, If the thread is only damaged in a small area as you suggest it
should be possible to "chase out" the surplus material with a good hard
bit of steel - the edge of a small sharp file would probably do it.
You would have to use a scraping action.

You could then use the old shock retainer to clean the thread before
you use the new one. Plenty of copaslip or similar would help

John










CopyrightC LotusElan.net and the author:

ngiovas
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PostPost by: Elan45 » Mon Jul 25, 2005 11:57 am

Unfortunately, those thread files only work on external threads, not the ones inside the tube. Nick gave good advise of using a scraping motion w/ thetip of a file or some other hardened steel piece. At one time, I kept someof the steel nuts that used to be used to retain the shocks, before they went to the die cast ones we see today. I filed them in such a way that theywere sort of like a tap, but even they were too soft. Better than nothing,but they didn't last.

Roger


have "ridges", with file teeth, that match the number of threads per
inch or metric equivalent. You need to get one that is correct for that
thread pitch (No. I don't know what it is). These are then used to
remove burrs from the threads.

Not sure where to find them. Try a shop that caters to machinists or
tool and die people.

CZ

ngiovas wrote:


--
Carl H. Zahler
***@***.***
























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PostPost by: M100 » Mon Jul 25, 2005 7:53 pm

On Sat, 23 Jul 2005 23:49:21 -0000, "ngiovas" <***@***.***>
wrote:


1.895" major diameter 24 tpi 60 deg thread was what I had some
replacement tubes made to a few years back.

I think its a "special" rather than something standard as the only
threads around that size and fine pitch I've come across elsewhere are
bicycle bottom brackets (where the shaft connecting the pedals rotates
in the frame) but they are all usually around 1.375 - 1.5"

Martin

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PostPost by: ngiovas » Mon Jul 25, 2005 9:29 pm

I actually found a thread file at a local shop that was for external threads
on the center of the file (different pitch on all four sides) and said it
was for internal threads on the two ends (also different pitch on all four
sides). The guy at the shop said they are very slow to use, but they
actually work if you take your time. I thought it was worth a shot for
$9.00. I worked at it for about 10 minutes and got one of the old caps to
start, but as Roger said, the metal is still fairly soft even on the
original caps. That still helped. I am going to work at it some more with
the file and then try the new cap.

Thanks for all of the tips.

-----Original Message-----
From: ***@***.***lto:***@***.*** Behalf
Of Roger Sieling
Sent: Monday, July 25, 2005 7:57 AM
To: ***@***.***
Subject: Re: [LotusElan.net] thread size for rear shock tube.

Unfortunately, those thread files only work on external threads, not the
ones inside the tube. Nick gave good advise of using a scraping motion w/
the tip of a file or some other hardened steel piece. At one time, I kept
some of the steel nuts that used to be used to retain the shocks, before
they went to the die cast ones we see today. I filed them in such a way that
they were sort of like a tap, but even they were too soft. Better than
nothing, but they didn't last.

Roger


have "ridges", with file teeth, that match the number of threads per
inch or metric equivalent. You need to get one that is correct for that
thread pitch (No. I don't know what it is). These are then used to
remove burrs from the threads.

Not sure where to find them. Try a shop that caters to machinists or
tool and die people.

CZ

ngiovas wrote:


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--
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***@***.***













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