Exploradome sells a kit
for dome rotation. I thought a different design might be fun to try.
But first, you need wheels.
I wanted a urethane type, with a 1/4" or 5/16" hole for the axle,
and ball bearings if I could find them.
After some digging, Sport's
Shops sell repair kits for inline skates and offer a variety of wheel sizes
An 80mm wheel comes out
to 3 1/8: and should be what I needed.
Here is a pix of what
I thought you might like
the pretty printing. Others were much better but cost more. Note the two ballbearings
that are included. Very smooth, they are.
About 7/8" thick
which was great.
And, 8 of them are $40.
$5 each. I bought 16 total and there will be a wheel every 22 1/2 degrees.
Wanna save a bit more? Buy them on the internet. "Dick's" were the
cheapest. BUt I wanted to see and feel and measure.
Btw, a 1/4" bolt/shaft
fits perfectly in the 8mm hole of the bearing.
are the current thoughts of how the ring will look in cross section.
Turquoise - Top ring attached
to the dome
Yellow - Middle ring that holds the wheels.
Salmon - Bottom ring attached to the walls of the Asylum.
The wheel is pink. An
approximate location of each corner of the octagonal walls is in red (Corner
Post) and an approx location of the walls themselves is in green. Being octagonal,
the wall between the posts will measure less than to the post.
I am going to build the
posts and walls before I finalize these measurements.
But, doing things this
way, a number of issues go away and benefits arise.
The dome will be alot
more round than using the plastic rings etc.
This arrangement should
operate much more smoothly than the Mfgr' method.
It might be cheaper than
buying the mfgr's version.
I will have more wheels
to distribute the weight. I hope this allows the dome to be pushed from one
place to the other very easily.
A problem I am facing
will be to keep the ring segments, after being glued together, round and concentric,
one to another. Especially, the groove where the wheels will ride on both
the upper and lower irings..