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Almost jigless bicycle frame building

Step 2Base

Base
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  • base-front.jpg
  • base-back.jpg
The base is just three pieces of the angle iron welded together. You have a main piece about 4' long that serves as the flat surface you will do most of your work on.

A smaller piece, about 2' long, is welded underneath it to form a sort of Z-profile. This piece is used to clamp the jig to the front of your workbench. If you want to bolt it to your workbench you can drill some mounting holes in it.

The final smallest piece is about 8" long as is welded perpendicular to the top piece. This gives three surfaces that are all orthogonal to each other. Measure with a machinist's square to make sure the angle is 90 degrees before you weld it!

Note: when I say "weld", this includes other joining techniques such as brazing, or even drilling and bolting/riveting.

Also shown in the picture are the dummy axle and a tube lift, which are described in the next two steps.
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Author:drwelby
I grew up on Legos and the Whole Earth Catalog. These days: bike builder, map maker, trail sleuth.