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Construction Notes |
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The
Inner dome disc |
| The
inner dome disc is made from 9mm MDF and holds
the eye stalk mount which is made from 3/4" CDX
ply glued in place. The disc also mounts a
turning 'stop' to minimise trapping the lighting
wires. (actually its a rubber door stop - but it
does the trick, so why not.) |
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The disc
also provides a flat surface for mounting the
dome to the neck bin bearing, and the eye stalk
is fitted to the bracket with a single M4 bolt,
providing the pivot point. |
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Turning the
dome is a manual task (as if there's not enough
to do in there) |
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| Due to
the design, there is nowhere to fit a motor and
geared wheel, so motorising this will take some
re-design and rebuilding work - so it will have
to wait. |
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The
Neck Bin |
| The neck
is made up of 1/2" x 1" softwood struts with 9mm
MDF top and bottom rings. The top ring is fitted
with an M4 centre bolt onto which the dome sits,
allowing it to rotate. |
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| As for
the inner mesh - I refused to pay the
extortionate amount of money asked for the
'proper stuff' and decided I would make it
myself. |
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| The
outer layer of 'mesh' is made from 1/8" conveyor
belt rubber, punched with rectangular slots,
formed using a home-made punch made from
printers cutting rule. |
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| This
worked fine, but took absolutely ages to do as
there are 108 slots in each piece and 8 pieces
were needed to complete the inner bin. Inside
the mesh is a layer of thin black material,
which make visibility virtually non-existent. |
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|
Neck Bin Bearing Ring |
| Made
from 9mm MDF, the bearing ring has an 11mm
groove routed into the underside. This groove
holds 99 x 10mm steel bearings packed in
graphite grease and held in place with two
circlips around the M4 centre bolt. |
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|
Neck Rings |
| Made
from 3/4" MDF, the three rings that form the
neck ring assembly were routed into three
different diameters. These are fitted to 1/2" x
1" softwood strips to form the ring assembly.
The assembly is fitted over the neck bin and
secured with screws. |
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|
Neck Ring Detail Blocks |
| These
were formed from hardwood blocks profiled to the
required shape. Two RTV101 rubber moulds were
taken and from these, 24 resin blocks were cast. |
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| After
sanding the recess to fit around the 1/2" slats,
these were painted in gloss black acrylic paint
and lacquered. |
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| A 12mm
steel bearing was glued into each of the
castings after painting to give the final
effect, and the blocks were glued to the
completed ring assembly. |
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Go to Part
5
- Shoulder |
