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Greg,
Prompted by Jon's dilemma re viewports &
wanting to get down to 1000 ft, I'm
forwarding this idea for your
scrutiny.
I've had thoughts about making a dome by
stacking 2 rings of 100mm (4") thick
acrylic on top of each other & a disk
on top of that, & gluing together.
The first ring starts off as a 600mm (24")
circle cut out of a block of 100mm thick
cast acrylic.
Then a 500mm circle (disk) is cut out of that. This
disk is kept to go on top.
Another disk is cut & ring formed
slightly smaller than 600mm diameter with a wall slightly larger
than
50mm wide.
So you end up with 2 donuts stacked on top of each
other & a disc on top of this.
You either glue them together & machine them to
a dome or machine them close, glue them & sand & polish.
This would use about 1.2 meters x 600mm of 100mm
thick cast acrylic, & give you a dome 40-50mm thick.
Possibly a dome that would get you a 1000ft
operating depth for under $4000-.
If you used a larger diameter for the bottom ring
you could machine a flange on it too
The person who blew my dome told me the joins would
be invisible unless at eye level looking straight at the join.
Any thoughts on this idea thanks.
Alan
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