My BMW Bobber,
CAD version here
|While Aad completed welding of the fueltank, I decided to get
started on the front brake modifications. The idea is to use a
stock BMW 1980, 2 leading shoe front brake because it works very
well, but to modify it by adding a funtional airscoop and some
vents. Since I have the whole thing designed in CAD I started
with some fullscale prints.
used 3M photomount
glue to mount 3 prints of the scoop onto 18 mm MDF, and then
roughly cutout the shape with a jigsaw. The more precise sawing
I did on a small tablesaw. I removed the paper from one of the
cutouts, applied some strong industrial glue and screwed another
cutout on top of it. I then used the beltsander to straighten
the outsides and with a handheld milling machine for wood I
rounded the top edges.
I cut out an oversized piece of 3mm aluminum and clamped that
between the glued and rounded cutouts on the one side and a
third cutout on the other side to keep the top of the scoop
flat, Then I gently
started tapping the edges around the wooden shape (buck) with
a wooden hammer (mallet) untill it fit exactly. Next I will
trim the edges so it fits the brakeplate exactly and I will
drill the vent holes, then my friend Aad will weld on the scoop.