I should add Jonathan St Mary's contribution where, on Friday, he began the machining and assembly of our new buck- home-made mostly from McMaster-Carr items. Jonathan got a great head start; Saturday morning Brendan, Dave and I completed the device- at least sufficiently for the day. Over the course of the day a few design improvement possibilites made themselves quite obvious.
We drove about 14 rivets per hour, with no rejects (no rejects for this application, anyway). There are a number of important features to getting a good rivet. First is temperature- white hot, just short of sparkling (burning), out of the forge to provide the greatest length of time to drive prior to being too cool to drive. White hot is around 1900 deg F; the rivet can be driven down to about 1250 deg F. Next the transit time from the forge to "Go!" must be minimized, for the same reason. Starting the driving at 1400 deg. F doesn't work- not enough time to swell the shank and form the head. The buck must be firm on the back side- this is somewhat obvious I suppose. The last important item is the riveter having as much body mass behind the gun as possible (or an incredible amount of upper body strength)-- so all energy from the gun goes into driving the rivet and not bouncing the rivet gun, and operator, all over the place. It's a lot of fun when it all goes right.
No 9's frame is coming along quite well- with nearly all holes attaching the important rear frame members, including the casting, prepared for fitted bolts. The next step will be to flip the rear frame assembly over to fit the truck center casting, rear beam, and straps that form a gusset between these components. We'll begin work on the forward frame shortly as well.
This year's progress on No 9 has felt great so far. We'll have to keep up the momentum.
Be patient with Stephen H on getting pics up-- I believe he's facing a major business trip in the next few days.
Jason