Wazza wrote:toff wrote:.... placement of the venting holes as the work of Geoff Scott.
Venting holes

When building a bike, the brazing process can potentially damage (or at least weaken) the tubing, due to the high temperatures involved. Overheating steel tubing can make it harder, and therefore more brittle. This can increase the likelihood of fatigue related failure of the tubing at some point in the future.
To de-localize the heat, framebuilders drill small holes at key positions on the frame. They are most commonly seen on the seatstays, near the dropouts, as this is a common fatigue point. The holes allow hot gases created whilst brazing to escape. The holes also allow the molten brass (or silver compound) to flow more readily into the joint.
Holes are usually about 1mm in diameter. There is probably a more correct name for them, but I use the term venting holes. Since the holes are usually found at the bottom of the forks, and the bottom of the seatstays, people sometimes assume that they are water drainage holes, which they are not. On my Geoff Scott track bike I have venting holes near the brake bridge...
Jonbays, I didn't think Geoff Scott made the production range of Clamonts. If yours has a "Hand built by Geoff Scott" sticker on it, then clearly I'm wrong, but I thought he only made the high end "8" series and "Professional" frames. My Clamont is a mid-range "5-something". Will need to dig it out and see if I have a sticker myself...