Wednesday 28 Nov 2012 4pm
I’ve spent the last couple of days making a jig to hold the
components for the rear suspension swingarms in place while the carbon
fibre/epoxy mix sets around it. I started with a piece of 3mm galvanised iron
and set the pivot points accurately in place using engineer’s buttons.
This pic shows the first hole for the wheel axle already
drilled and the set up for placing the hole for the swingarm pivot. A clamp is
holding the second button in place while the very nears are controlling the
placement.
This pic shows the set up for drilling the shock absorber
pivot. I’ve machined a large button to set the distance from the swingarm pivot
and I’m using a ruler and verniers to get the distance below the pivot set
accurately. Drill bits are holding the button and ruler in place.
This is the end of two day’s work. It’s the finished setup
for the left hand swingarm. To the left is the axle mount, made from two axle
nuts welded together with a small spacer between to bring it out to the
thickness of the swingarm. Next across are the two mounts for the idler wheel
I’ll be using to tension the chain. Then there’s the tube (6061 aluminium) that
will be the axle for the swingarm. Lastly are the two shocker pivots, held in
place with a spacer between. The wooden block isn’t absolutely necessary, but
helps me to control the shape of the swingarm, which is offset by 30.2mm. Next
step in this process will be to make the foam core for the swingarm itself.
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