I'm going to try this with cooling wax to craft a parabolic mirror, wish me luck friends! If the parabola shape is not a function of wax viscosity it should hold approximately the same shape while cooling, right?
I was thinking the same thing,, but worry the wax might be too pliable, so am thinking about hot oil (or water) and melted thermoplastic. Or, maybe a higher temp hot glue. As long as the bottom surface of the material is smooth, I can use it as a form for shaping my final surface. (I'm doing an acoustic reflect.)
@profbriankirby What would happen if this experiment was done in a cylindrical tank - would it produce a parabolic disc shape like a radar or satellite dish?
You put a liquid in a cold space with zero gravity, spin it about the short axis up to an rpm where the surface creates a parabolic shape, but not so much where surface tension breaks the shape, and keep it going until the liquid freezes. Now you have a perfect lens
Epoxy? It's liquid when you mix the chemicals -> start rotating the tank in a steady speed. To be fair, if you want it to be perfect, you will need to do that in zero gravity and vacum or at least an linear induction motor, heavy masses as freewheels, a quantom locked state in a vacum chamber and then you have to drop the mould and directly pour the material in you want to shape, e.g. glas and silver nitrate for a mirror
Forget about what I said about zero gravity. You need gravity, but then you'd need to have quantum locked state and vacuum for the friction free motion.
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I'm going to try this with cooling wax to craft a parabolic mirror, wish me luck friends!
If the parabola shape is not a function of wax viscosity it should hold approximately the same shape while cooling, right?
I was thinking the same thing,, but worry the wax might be too pliable, so am thinking about hot oil (or water) and melted thermoplastic. Or, maybe a higher temp hot glue. As long as the bottom surface of the material is smooth, I can use it as a form for shaping my final surface. (I'm doing an acoustic reflect.)
@profbriankirby What would happen if this experiment was done in a cylindrical tank - would it produce a parabolic disc shape like a radar or satellite dish?
great content, thank you
What happens to this experiment under vacuum?
How would you use this practically to make a solid parabola mould?
You put a liquid in a cold space with zero gravity, spin it about the short axis up to an rpm where the surface creates a parabolic shape, but not so much where surface tension breaks the shape, and keep it going until the liquid freezes. Now you have a perfect lens
@@noreaction1 Thats not practical.
Epoxy? It's liquid when you mix the chemicals -> start rotating the tank in a steady speed.
To be fair, if you want it to be perfect, you will need to do that in zero gravity and vacum or at least an linear induction motor, heavy masses as freewheels, a quantom locked state in a vacum chamber and then you have to drop the mould and directly pour the material in you want to shape, e.g. glas and silver nitrate for a mirror
take a screen shot
Forget about what I said about zero gravity. You need gravity, but then you'd need to have quantum locked state and vacuum for the friction free motion.
So viscosity does not affect the shape?
Probably does.. in the short term..
Too bad water doesnt expand when it freezes. It would make a perfect solid template substrate.
try with resin...