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Step 4Laminate 2x4 and Drill holes for BB
Cut a couple feet of 2x4 off to use as the short piece laminated to the under side of the long piece to create thickness for supporting the BB and HS holes.
Glue and screw the pieces together creating the beam.
Mark the beam where you want the BB to be centered. (pencil and speed square)
Drill shallow (1/2" depth of the BB cup) 2-1/4" dia (equal to OD of BB cup) hole for the BB on right hand side of the beam (chain ring is on right side). The hole saw cuts a cylindrical cut into the wood. Leave the inner wood intact to facilitate drilling the three 1" through holes.
Drill similar hole on left side but go 1-1/8" deep to recess the left cup into the wood so the two cups are the crank required 2-7/8" apart at their outer edges. (measure an actual kid bike's BB width to see what I mean.
Glue and screw the pieces together creating the beam.
Mark the beam where you want the BB to be centered. (pencil and speed square)
Drill shallow (1/2" depth of the BB cup) 2-1/4" dia (equal to OD of BB cup) hole for the BB on right hand side of the beam (chain ring is on right side). The hole saw cuts a cylindrical cut into the wood. Leave the inner wood intact to facilitate drilling the three 1" through holes.
Drill similar hole on left side but go 1-1/8" deep to recess the left cup into the wood so the two cups are the crank required 2-7/8" apart at their outer edges. (measure an actual kid bike's BB width to see what I mean.
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