PVD Head Tube

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Revision as of 22:30, 2 July 2007 by Pvd (talk | contribs) (Revision B)
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Why

Push the limits.

While I get tooled up for a nice light steel integrated head tube, I have started doing a high quality 4130 machined head tube.

I'm making this tube for my wife's new bike.

Revision A

A 4.500" head tube for 1 1/8". Only 49 grams! Crazy light!

The weigh in:
PVD-Headtube-1.jpg
Stock. 1.500"x.083" 4130
PVD-Headtube-2.jpg
Clean up the end for the live center.
PVD-Headtube-3.jpg
Marking start and stop points.
PVD-Headtube-4.jpg
Roughing out to 1.400"
PVD-Headtube-5.jpg
Finished to 1.375" OD.
PVD-Headtube-6.jpg
Cut the rings to 1.438"
PVD-Headtube-7.jpg
Clean up the ends after cutting off.
PVD-Headtube-8.jpg

Revision B

The initial tube had a few issues that I could not live with. While I need to keep this design on the cutting edge, a slightly more conservative design should be done first.

Pvd-std-head-tube.gif

93 grams before post welding machining of the ID step for the cups press fit.
PVD-Headtube-9.jpg
Rev A v. Rev B.
PVD-Headtube-10.jpg
In the jig. Keeping the bearings spread apart helps increase the strength of the system.
PVD-Headtube-11.jpg

See Also

PVD The Girly Bike