Re: Tinsmith's in frame gas tank for cantilever Schwinn.
Dan got the copper tank together yesterday with nice results I think. I like it very much. No photos of it coming together because I forgot the camera. But I watched closely and learned a good bit, I think. Dan was not entirely happy with the soldering and determined that the big iron was too much for this job, tending to overheat and then glazing the iron (when that happens the shiny solder look changes to a dark scale and fouls the iron...). Then Dan would have to clean the iron tip on the sal amonica block, let it cool down some and proceed in starts and stops. A rheostat switch would have given a means of controlling the heat. It was interesting to watch how impossible it was when the conditions were wrong and how smoothly the solder flowed when conditions were right (clean tip, the right temperature and presence of flux). Even so, I think the tank looks great before any cleaning up. The two holes you see on one side of the tank are the same size as the petcock fitting on bottom and they are for a sight gauge which was kind of an afterthought inspired by the one on Barelyawake's Rollfast build a year ago. This is his idea, not mine. What will fit into these two bushings are a pair of 90 degree angled brass hose barbs pointing toward each other with a section of clear line between... a simple and elegant sight gauge to see at a glance how things are with gasoline. We would like to have placed the holes a little differently, but punched them when the tank was together minus the bottom piece... so this was the best we could do with the limitations of the tool. Had I thought of this sooner we could have placed the top hole higher up and the bottom hole lower down. Next time I will.
Next comes the cleanup including getting rid of some of the excess solder. I . would welcome suggestions from anyone on how best to do this. Anyone? I was thinking perhaps to sand down the couple dribbles with the dremel sanding drum. Baird, what did you do? I'd like to get rid of a good bit of the solder somehow, leaving the actual seams, of course. I have started cleaning with very fine steel wool and the luster of the copper is something else. More photos will follow later as cleanup progresses.
Someday when I grow up I will probably lose interest in toys with wheels, but until then...