I’ve been busy in the workshop, just not posting anything. I’ve been trying to get the mitering fixtures setup and there are always bumps along the road. Recently I’ve been busy machining a dummy headtube block for my Sputnik main tube mitering fixture. The fixture came with useless heat tube blanks, 1-7/16″ and 1-5/16″ I use 31.8mm and 32.4mm headtubes. The original block was made with form cutters. I don’t have form cutters, so instead I’m machining three chunks of aluminum into the part I need.
I seem to be achieving decent accuracy. Right now I’m estimating accuracy right around 0.1mm (approximately four thousandths of an inch). Not the most amazing precision, but decent. Once it’s finished I’ll compare the product to specs.
Today I machined the middle block out of arbitrary metal and produced the male slide. Tomorrow I have a tricky operation — machining the female grooves in my semi-cylinders. That will be finicky to get perpendicular. I’ll be relying heavily on the dial-indicator fixture I made last week.