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1" Threaded Fork Question : First threads damaged..

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1" Threaded Fork Question : First threads damaged..

Old 05-21-16, 12:46 PM
  #1  
bloom87
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1" Threaded Fork Question : First threads damaged..

Hello all,

I am really stressed out. I tried to remove the fork crown race myself and I didn't pay attention to the surface the steering column was on. What an amateur I am... after all these years... !

Result : hammering the race, I ended up damaging the first few threads of my fork.

My question is : do you think the steering column cutting tools that some bike shops have will be able to cut such a small part of the column ?
Or is there any other way to fix this ? it's a valuable fork, that's why I'm asking.

Thanks !
-stressed out bloom

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Old 05-21-16, 01:00 PM
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Have you asked the shop??

do you own or are you willing to buy some Needle files with a diamond shape like the profile of a thread \\\\\

and carefully file the damaged portion to work again.


My father was a Machinist , there are specialty thread files , a Machine shop will have one & do the job for you for $

Last edited by fietsbob; 05-21-16 at 02:10 PM.
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Old 05-21-16, 01:11 PM
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bloom87
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Originally Posted by fietsbob View Post
Have you asked the shop??

do you own or are you willing to buy some Needle files with a diamond shape like the profile of a thread \\\\\

and carefully file the damaged portion to work again.
Well the shop is closed until tuesday here so I'm anxious to know what will happen when I ask them...

Buying tools is not really an option because I'm moving and getting rid of stuff...

Thanks for the reply.

Are you implying it could just be re-threaded and filed so the top is straight ?

Last edited by bloom87; 05-21-16 at 01:15 PM.
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Old 05-21-16, 01:23 PM
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Once You clean up the thread the headset lock nut will cover the ragged edge ..
do something else until the Bike shop opens, then ...

Yard Work or House cleaning? the dishes ?
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Old 05-21-16, 01:56 PM
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bloom87
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Originally Posted by fietsbob View Post
Once You clean up the thread the headset lock nut will cover the ragged edge ..
do something else until the Bike shop opens, then ...

Yard Work or House cleaning? the dishes ?

you're right, I should worry about it next week :-)

thanks
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Old 05-21-16, 02:12 PM
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Its Memorial day Holiday Honor the past generations ..
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Old 05-21-16, 02:39 PM
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You can always just grind a taper to the top of the tube.
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Old 05-21-16, 02:45 PM
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A small triangular file can be used to cleanup and reprofile the top thread back to usable condition. Any hardware or home store has them and even good ones are cheap.
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Old 05-21-16, 03:57 PM
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Thanks guys, really appreciated. I can celebrate memorial now ;-)
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Old 05-21-16, 04:22 PM
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That is a piece of cake fix. Ten minutes with a file and you are good.

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Old 05-21-16, 08:22 PM
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Thread file, FTW:

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Old 05-22-16, 07:33 AM
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Originally Posted by JohnDThompson View Post
Thread file, FTW:

Yeah, those look nice, but make certain you get the correct pitch.......
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Old 05-22-16, 07:50 AM
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What are your goals with the frame?

How tall was the headset you took off? Was here a washer or a spacer in the headset? Center Pull or Canti Brakes?

What I would be tempted to do would be to take a regular flat file and file off 1/8" from the top of the steer tube, shortening it slightly. If you had a spacer, then simply leave the spacer off and you'll be fine.
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Old 05-22-16, 08:31 AM
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Originally Posted by AlexCyclistRoch View Post
Yeah, those look nice, but make certain you get the correct pitch.......
Those just show 2, But others, I've seen , Having 2 ends & 4 faces they potentially have 8 different pitches, each
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Old 05-22-16, 08:39 AM
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Clean that up with a small triangular file as stated and don't worry about it again.
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Old 05-22-16, 09:31 AM
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Better if 55~60 degree angle of cutting faces .. if you want the thread back to close to before ..

Shade tree .. will be a bigger ''close enough " equilateral triangle ..
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Old 05-22-16, 09:58 AM
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Flat file a little of the top...thread file will not leave a sufficient amount of thread at the top anyway, and you risk damaging the threads below....JM2C's Ben
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Old 05-22-16, 10:53 AM
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Originally Posted by fietsbob View Post
Better if 55~60 degree angle of cutting faces .. if you want the thread back to close to before ..

Shade tree .. will be a bigger ''close enough " equilateral triangle ..
Uhhh, an equilateral triangle has the faces at exactly 60 which is the thread angle of most common thread patterns so it isn't shade tree.
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