Wednesday, March 26, 2008

Davis fork crown

This is a Davis sand cast fork crown from the 50's. The first two pictures show the crown in the untouched state. The crown is pretty crude to begin with. I refer to these sand castings as lumps of coal. It takes a great deal of labor to make them presentable. These castings make me appreciate the quality of investment casting. I wouldn't want to work exclusively with sand castings but occasionally it's fun.

I didn't like how the groove looked on this crown so I filed it with brass. Since the fork will be silver brazed the brass won't melt when I heat the crown up again during construction. You can see I removed a lot of steel in coming up with this shape. Additionally I thinned out the crown a great deal. I will thin it more after brazing up the fork.

Monday, March 24, 2008

Paint class

I'm back from my painting class now. I won't bore you with the countless photos of my squirting paint but the first picture gives you the idea. I'm spraying on primer. The rest of the pictures are of one of the frames. I couldn't get the lighting right to show the green pearl. The frame looks primarily white but in the right light there's green iridescent sparkles within the clear coat. It's subtle and really nice.

Friday, March 14, 2008

Polished crown

Here's a couple of pictures of Frank's stainless steel fork crown after polishing. The pictures don't really capture the shine very well. I need to work on my photo skills. The other two are photos of his fillet brazed stem. The stem will be painted to match the frame. I'm taking this frame and stem along with Pete and Tom's frames and forks to a frame painting class this next week at Doug Fattic's shop. Doug is an excellant builder, painter and teacher. The class will shorten my learning curve a great deal. I'm very excited. I won't be in the shop from March 15-23 and I doubt I'll access the internet until I return.

Tuesday, March 11, 2008

Tom's club racer

This is another club racer. I know Independant Fabrications has a model called a club racer too but the term "club racer" is an old one. So I don't feel like I'm ripping their idea off. Besides, they don't do lugs. This bike, like the previous two, is designed around standard reach caliper brakes and the brake bridge and fork are built so the brake pads are near the bottom of the slot. This requires a fair bit of accuracy during the build because if the fork is a little too long or the bridge too high and the brakes won't reach the rims. That's bad! Why do I bother with this? Well this sort of bike is all about options. The additional clearances under the brakes allow for a range of tire widths and the eyelets make fenders possible. Tom lives in So. Cal so fenders probably won't make sense but who knows? If he wants to stick 30mm tires on and explore fire roads he can. If that doesn't appeal to him 23mm will be just as at home on this frame. The lugs, crown and bb shell are Sachs castings. Tom has agreed to let me paint it anyway I wish. How cool is that? I will be painting the same as Pete's club racer because they want me to. Pete lives on the East coast so the twins will be seperated by about 3000 miles. Hopefully they will get ridden together sometime though.