Originally Posted by
scarlson
True enough, I used my calipers as dividers a lot doing this stem. The measurements match up equally often to inches, metric, or nothing-in-particular!
It will be comparatively easy to CNC mill these in various lengths, or maybe waterjet, so that's what I'll be looking to do next, provided there is not another lockdown. If there's a lockdown, I'll braze a stoker stem like
timdaw, and maybe see about a cheap desktop CNC router. It is theoretically possible to do them all with a drill press and some files after the basic shape is roughed-out, but it is quite tedious.
the center slot is a big swallow on a CNC router... I guess a bunch of passes.
the underside of the stem at the headset I find interesting, old memories of Rene Herse stems, I thought they were straight across at the nut, or at least counterbored to fully mate with the headset lock nut.
Way Way back on my first club ride in 1972, a club member had a RH, what an attractive bike! Really looked intensely at the details, including the stem. I had a "pedestrian" by comparison Bertin C-37.