Second day on Doug Fattic’s Frame Building CoursePosted: May 4, 2011
Today, after noting down all our tubing specifications, dimensions and angles, we marked and mitred our frame tubes so that they would fit snugly against the other tubes at the joins. We rolled the tubes on a flat surface plate, watching to see daylight underneath, so that we could tell which side of the tube was straightest. This plane of the tube will end up vertical on our bikes, so that there is as little lateral deviation as possible.
Next, we put the tube into the fixture on the Bridgeport milling machine, an American classic!
Bill and I got to know the milling machine intimately today as we would go back to take another cut to make sure it was the right angle and diameter.
Next, Doug showed us how he made the wooden blocks he uses to hold the tubes in a vice when they are filed and worked on:
We had to file the edges of the bottom bracket shell so that they were clean, at 90 degrees to the tubes, and the tips of the shell came to a clean point:
Doug let me use his prized chainstay socket reamer, once belonging to his favourite English builder of all time, Johnny Berry.
Well, that’s all for today folks. Stay tuned..