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Re: acrylic; motors
Acrylic plastic (thermoforming plastic), can be thermally deformed at 280 to
350 degrees F, depeding on purity and additives. It would be very hard to
get this temperature using electrical heaters, but it would depend on the
size and thickness of the sheet. For a two foot by two foot thick sheet of
1/16 inch to 1/8 inch sheet of plastic, I would use a gas BBQ grill. I used
to vacuum form Polyethylene and Polypropylene sheet with a fish fryer
burner. It was cheap and efficient. Although PE and PP has a lower
deformation temperature than Methyl Methylacrylate (Acrylic), this amount of
heat energy (160,000 BTU), provided a quick turn around time. For what you
are attempting, try a gas BBQ grill. Use toggles, gloves, and don't burn
yourself.
As far as oil is concerned, most deep water thruster use mineral oil. I
experimented with various oils on my DPV motor. You have to make sure you
don't dilute any greased bearings. Since I used a high pressure rotary seal
on my shaft, I found that I didn't need the oil.
If you intend on depths >1,000 ft, then yes by all means get the oil out,
otherwise a good rotary seal will work well.
Also, make sure you don't suffocate from oxygen deprevation, or Carbon
dioxide buildup (shallow water blackout).
Paul
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