Thursday, August 03, 2006
Finished Bike
Above are photo of the finished assembled bike. I got a little too immersed in the welding and finishing stage to take photos. I'll be sure to get some next time.
Wednesday, April 26, 2006
Tube Fitting
Tube Cutting
The next step is to lay out the dimensions on the tubes. I use a blue layout spray ink and mark the cuts with a fine scribe. Next I cut the tubes to length with a cut off disc. To miter the tubes I do things a little differently now. I used to use bi-metal hole saws to miter tubes on a lathe using a tube holder in place of the tool post. Now I use a mill based belt sander I built to work with very thin walled True Temper S3 tubes. It makes for very accurate cuts in any diameter required. You just need to make a simple round spindle for each size.
Tube Drawings
Monday, April 24, 2006
JIG Drawing
JIG Model
Frame Model
I also add models of wheels, tires, bars and stem etc to check for clearance.
Frame Layout
The first step I take when building a new frame is to create a CAD drawing of the geometry or in most cases modify an existing CAD file (for a previous frame) to reflect the new geometry. Using this sketch I can capture the required geometry and fit for the rider. I can also check things like toe overlap.
Sunday, April 23, 2006
back40 bicycleworks frame building blog
Over the next little while I will be posting here and documenting the build process I use to construct custom steel bicycle frames. I build as a hobby and have constructed about 20 frames to date. The build blog will chronicle the steps I take in building a 29" wheeled rigid mountain bike frame and fork. Stay tuned for photos and descriptions...
Over the next little while I will be posting here and documenting the build process I use to construct custom steel bicycle frames. I build as a hobby and have constructed about 20 frames to date. The build blog will chronicle the steps I take in building a 29" wheeled rigid mountain bike frame and fork. Stay tuned for photos and descriptions...
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