Technical & Reference Section > Tech and Restoration

Fork thread Die size

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The-flying-banana:
Ash are you a turner ??? as that is "in the know" matey ;)  and i bet you cant get a die that size for love nor money.

graeme:
Cut off the threaded section, and weld a new threaded section on, from another pair of forks.
As long as you use a jig to keep it all straight, and 45 degree chamfer the cut ends for good weld penetration it will easily be strong enough.
I recon it will take an hour tops.

mivvi:
Hey Ash, your a star mate! Can you just let me know what you would have checked on the 'Shadowgraph'? Do I need this info?

Stidds, your further info explains a lot. My bike shop would have been scratching their heads all day.

Graeme, I think your plan will be my last resort as I don't have an old pair to cut down and my welding ain't up to that amount of skill. Im a software and electronics kid, all this welding is new to me!

Well thanks all, you never let me down. Really appreciate your input!

Ash, if you could let me know if I can just go and buy one of these (off the shelf) so to speak, with the info you gave me? Ta,,,,,,

ash:
YEP I'M A TIME SERVED SKILLED MACHINIST ;D
turning milling grinding welding cnc etc etc ;D
now work in quality control :-\
the shadowgraph just blows up an enlarged image of the form so you can
measure it more accuratley
i was going to check the thread angle to give us a bit more of a clue
and no i dont think you'll get a die that size  :-\
unless they use them in the states (they use some strange threads over there) ???
not BS (british standard)
this link may explain a bit better http://www.colinusher.info/Livesteam/mewdata.html

Donker:
time served here aswell mivvi and i agree that you will not get a die, and even if you did its very unlikely you will re-thread over weld without it being machined first, in which case you could fit an axle to the forks and get a turner to grip it in a 4-jaw chuck and screw-cut the threads. (using a fixed steady of course) this is unquestionably the most accurate method ensuring perfect threads but graemes option is the way i would go, easiest and cheapest, but to make it as strong as possible (especially if riding) i would weld a supporting piece of tube inside.

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