Thursday, March 31, 2011
Monday, March 28, 2011
Wednesday, March 2, 2011
Tuesday, March 1, 2011
Bob's Commuter Bike - Rear Triangle
Over the past week I have worked out the rear triangle
and have fabricated parts to split the right rear seatstay
to enable the Gates drive belt to be installed. I machined
the split from 305 stainless steel and was pleasantly
suprised on how nice it machined on my little Smithy.
Tapping the holes was another story though. I broke
off my M5 tap while tapping the first hole. Luckily I
was able to grind out the tap after modifying (grinding
down the diameter) of a dremel grinding stone. It took
four modified stones to complete the job but I was able
to recover my part. I drilled and tapped for an M6 thread
(which I think looks better anyway) and the complete parts
look great. After that all I had to do was splice the parts
into the right seatstay and then braze the stays into the ear
triangle. Now it's time to finish these fillets.
Monday, February 21, 2011
Back to Work - Bob's New Commuter Bike
I am finally back to work after months away from the shop. We have been
very busy with kids activities (swimming and hockey) and a couple of
non-bike related projects. It felt great to get back to framebuilding. I am
currently working on a frame for myself. It is going to be my new commuting
bike. It will have a Shimano Alfine 8 speed internally geared hub and will
be Gates Carbon Belt Drive. I got quite a jump start on this frame due to
the fact that I had a front triangle already available. The first front triangle
that I built for Wayne's 29'er Single Speed was too short in the top tube
due to a mistake on my part. I went with an inacurate chart for the dimensions
of his previous frame instead of measuring his actual frame. I won't make
that mistake again. Anyway with the front triangle mounted in the fixture I
mitered the chainstays and brazed them to the sliding dropouts and the
bottom bracket. After finishing these joints I bent and mitered the seatstays
and they are almost ready the be brazed in. Now I just need to design and
fabricate some type of breakable joint on the right seatstay so that the drive
belt can be installed.
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