Your Head On Straight
with all things B9, there's more than one way to fasten the head
to the radar section. Here's how I did it. Note that this technique
does not allow the head to move up and down, but rather fastens
it to the radar section at a fixed height.
begin with the overview. The head assembly is complete. The radar
section is nearly complete (once again, please ignore the radar
ears and the funky red sensor, they have been replaced since these
photos were taken). I added a few additional inner support pieces
added to enhance the collapsed look. The Collar is also done but
you could do this step without it. It's just a little bit easier
having the radar attached to the collar due to the heaviness of
a 1 1/2" PVC end cap to the base of the neck flange using flat
head machine screws. Note that I've drilled 2 additional holes,
1 for the vertical axle used to spin the crown and turn the cam
that lifts the rods, and a 2nd to run the electrical for the lights
in the brain. Also note that I used a coupling here. There is no
real advantage in using this coupling, I just wanted the assembly
to be somewhat modular.
using some 1 1/2" PVC (schedule 40) I created the inner neck
support and put another end cap on the lower end. The lower cap
requires the same 2 holes as the upper. I chose not to glue any
of these PVC components. I like being able to dismantle things should
they require a bit of maintenance. It looks alot like a pipe bomb.
hole in the upper radar section is just the right size to accept
the PVC end cap. You'll want to check the PVC dimensions, and the
size of the hole in the radar section. Different manufacturers of
end caps may have different outside diameters. I wound up sanding
some material off of the end cap. Once the inner PVC neck is together,
test the fit and then get the bubble lifter ready.
Bubble lifter is made from silicone rubber and can be enhanced by
placing additional pieces of plastic inside. Each inner plastic
piece has a hole cut into it, so that when it sits over the inner
neck support, it will slide freely. I made the inside holes in the
top 2 or 3 inner plastic pieces a bit small so that they would fit
tightly against the outside of the upper PVC end cap. Doing so allowed
the bubble lifter to stay in place without the need for attaching
it to the neck or lower bubble plate.
the bubble lifter into place.
the neck into the radar section, and your done.