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Wednesday, September 17, 2014
Sunday, September 7, 2014
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.
Here it is with my dummy axle mounted in it to show how it works:
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.
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.
Posted by Joey Shemuel at 10:53 PM
Saturday, August 30, 2014
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.
Posted by Joey Shemuel at 1:16 PM
Thursday, August 28, 2014
I finally TIG-welded some practice pieces that don't look like shit! This one is a simulation of the stays on the Long Haul that I'm building.
We continued working on the folding bike, which will be almost entirely brazed, except for the chainstay-dropout joints, which our teacher is having us TIG weld (and there's no going back, now that they're tacked with stainless steel, since you can't braze over stainless).
Fitting up the stays:
The thin concentric line of brass is where we attached the angled plug (which is why the end of the stay is solid).
Annnnnnnnnd that's all Lightroom will upload for now. Slow connection. More soon.
Posted by Joey Shemuel at 10:38 PM