Oh, Stuff

This blog is so neglected, the fact that you're even looking makes it hum with titillation.

Thursday, October 30, 2014

Finally -- more photos!

 working on the pneumatic tube bender

96 new photos are up at my Flickr!

More to come soon. We're making a lot of progress on our bikes!

Wednesday, September 17, 2014

More photos are up!

Like this one!
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Check out more at my Flickr.

Sunday, September 7, 2014

Machining, weaving

I machined some precision aluminum v-blocks with a handle that will allow me to hold any bicycle-sized tube (basically from 5/8 to 1-1/4) in the tool-bit holder on the lathe, so I can use the lathe to cut miters instead of the horizontal mill. (The principle in either case is the same: you hold a tube at a particular angle and move it toward a hole saw, which cuts a tube-shaped hole in it. The lathe is just more precise, and more fun to use, than the horizontal mill, which is essentially a drill press mounted on its side, with levers that allow you to move your piece in the x, y, and z axes.) The part on the left is drilled with through-holes; the part on the right is tapped for an M6x1.25 bolt.

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Here it is with my dummy axle mounted in it to show how it works:
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I also attended my friend Alex's card-weaving workshop at the Lorax co-op today and made this headband, which I'm pretty fond of (scraggly, but OK for a first try). The Lorax is the sister co-op of UC Berkeley's Lothlorien house, so here's a shout-out to home.

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Had to do some serious rotary tool surgery on a seatstay-dropout joint on Friday. Turns out all the careful alignment examining evinced, eg, in the photo below wasn't enough to get it all straight. Pics of that soon.
JKS_0822_2400px.jpg

Saturday, August 30, 2014

A Stem I'm Building

I want to make a new stem for my touring bike, one that's a little more aggressive, with less drop (10 degrees vs 17) and more length (110mm vs 100). So I first had to draw it in SolidWorks, which is a modeling program that you can do pretty much anything in.

Here's the drawing I'll make it from -- except that it needs a little tweaking: the binder bolts that hold the bars in place need to be rotated so that they're parallel to the ends of the steerer tube clamp (see the upper-left drawing). The T-shaped slot with a single binder bolt on the steerer side (see the isometric view) is a design I stole from Steelman Cycles.

Click to biggify. If anyone is super dorky and wants to look at this in CAD, email me for the file.