HyperSpeed
Well-Known Member
- Joined
- Jan 21, 2009
- Messages
- 117
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I am trying to create a simple part that acts as a reflector for light striking it, for a somewhat special purpose. When dealing with mirrors, the focal-point of a perfect hemisphere would be the radius of the sphere. That is the shape which fits my needs for reflection. (The outside part shape is basically a cylinder with hemisphere in one of the ends.)
Two questions then arise:
Which metal of these two metals, when polished to a mirror finish reflects light better, without re-oxidizing from strictly air-contact? Brass alloy, or aluminum alloy? I would probably take the extra step if needed and apply a silver coating with one of the spray kits available. But only if necessary after polishing.
Will any milling bits provide a perfect hemisphere when cutting, or will this need to be done on a CNC lathe? (The part is roughly no larger than 55mm diameter/30mm length. The very tip of the hemisphere at the cylinder inside center is not as crucial as the other 80-0 degrees of the inside cut down the sides.) I do expect to have to polish the final part by hand to a mirror finish, just need to get close enough with the machining-phase.
Any suggestions or does anyone around here have the equipment to do this part? I can produce a CAD file of what would be needed, if needed.
Thanks for any help here.
Two questions then arise:
Which metal of these two metals, when polished to a mirror finish reflects light better, without re-oxidizing from strictly air-contact? Brass alloy, or aluminum alloy? I would probably take the extra step if needed and apply a silver coating with one of the spray kits available. But only if necessary after polishing.
Will any milling bits provide a perfect hemisphere when cutting, or will this need to be done on a CNC lathe? (The part is roughly no larger than 55mm diameter/30mm length. The very tip of the hemisphere at the cylinder inside center is not as crucial as the other 80-0 degrees of the inside cut down the sides.) I do expect to have to polish the final part by hand to a mirror finish, just need to get close enough with the machining-phase.
Any suggestions or does anyone around here have the equipment to do this part? I can produce a CAD file of what would be needed, if needed.
Thanks for any help here.