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Shortening a skewer and rethreading ??

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Shortening a skewer and rethreading ??

Old 03-08-22, 02:20 PM
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Tandem Tom
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Shortening a skewer and rethreading ??

I posted in General Discussion looking for a Bob Trailer Skewer.But I found a long one that we used on our tandem.
So I could use some advice about shortening and rethreading.
Thanks!!
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Old 03-08-22, 02:35 PM
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...I have done this before a number of times, when I had an oversupply of skewers that fit an 8 speed hub, and wanted some for five and six speed hubs. The cautionary note here is that the threads on most of these are originally rolled (afaik), for added strength to the finished product, as opposed to cut with a threading die, which is what you and I can access. It was pretty straightforward. Just figure out the threading on your original (they came in variations of threading), and match it with a threading die.

You want to extend the existing threads, before you shorten the end of it. This turns out to be much easier than cutting the skewer, then restarting the threading with a die.

In theory, it will be less durable, in terms of some future stress failure. I've not had any issues with this so far.
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Old 03-08-22, 02:45 PM
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It depends on whether the original threads were die-cut, or rolled:

Rolled thread on the left, die-cut on the right. The die-cut one can be extended using a die. With the rolled thread it is not a good idea.
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Old 03-08-22, 05:01 PM
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Maybe I need more coffee. I can't see a difference.
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Old 03-08-22, 05:05 PM
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Originally Posted by Tandem Tom View Post
Maybe I need more coffee. I can't see a difference.
Ha ha, I hear ya brother. The rolled threads increase the diameter of the area rolled whereas the die-cut retain the original diameter of the rod.
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Old 03-08-22, 05:05 PM
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Originally Posted by Tandem Tom View Post
Maybe I need more coffee. I can't see a difference.
answer above..follow the dotted lines to see the dia. change
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Old 03-08-22, 06:07 PM
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Got it!!
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Old 03-08-22, 08:12 PM
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Rolled threads are stronger because the metal is work hardened in the process, IIRC. Also, the valleys are less likely to be stress risers.
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Old 03-09-22, 08:21 AM
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Originally Posted by icemilkcoffee View Post
It depends on whether the original threads were die-cut, or rolled:

Rolled thread on the left, die-cut on the right. The die-cut one can be extended using a die. With the rolled thread it is not a good idea.
so this is the opposite of a roll tap then? move metal rather than remove metal?
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Old 03-09-22, 02:10 PM
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Originally Posted by spelger View Post
so this is the opposite of a roll tap then? move metal rather than remove metal?
Yes, the die deforms the bar stock metal to effectively "raise" threads on a pitch diameter blank. Changes grain structure of the blank in the threaded area, uses less material, is generally a faster process.
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