Re: Tinsmith's in frame gas tank for cantilever Schwinn.
Now Dan needs to cut the bottom piece which will close off the gas tank. He measures carefully so that there is an additional 1/8" or so of lip showing on the side pieces flanges to give more surface area for the solder to flow into. I forget the name of this cutting machine, but it is a little like a big paper cutter except that the blade cuts through the metal evenly all at once, else the metal would want to curl if it cut like a paper cutter. He marks the length and cuts off the excess. Then he marks the two spots with an awl where the mounting bolts will attach to the tank. Acorn nuts will be soldered from the inside, so the holes need to be bigger than the bolt and smaller than the outside edge of the acorn nut. You and I would use a drill probably, but the problem with a drill bit is that it can grab the metal and want to tear it. Dan uses a metal hole punch instead of drilling. You can see the blue box next to the tank which holds different sizes of punches which fit inside the punching tool. Pretty slick.
Someday when I grow up I will probably lose interest in toys with wheels, but until then...