Edited by Dave Cook, Yesterday, 11:15 PM.
Cave-Astrola 8" f/7 Model B Deluxe restoration / upgrade
Posted Yesterday, 11:13 PM
- tim53 likes this
Posted Yesterday, 11:26 PM
Today the polishing goodies showed up. I got sampler packs of the Chemical Guys polishing compounds and their foam polishing pads. They actually have 7 different levels of firmness on the pads (overkill anybody??) but I figure the 3 pads in the smaller sampler pack should be fine. The pads have standard hook-and-loop on the back.
Man, I hope you're wearing a *really good* respirator that fits well.
Metal polishing can be a real mess, and pose a serious inhalation toxicity danger.
The polishing compounds can be hazardous themselves, and many older aluminum alloys actually can contain a substantial amount of lead, and/or other toxic metals you *definitely* don't want to breathe
I'm likely "preaching to the Choir" about the above, but I simply care, and thought it worth saying, if even only for the benefit of others reading the thread.
But yes, on another note: your work is looking great Dave
Edited by Thomas_M44, Yesterday, 11:29 PM.
- Dave Cook likes this
Posted Today, 01:03 AM
Actually this stuff is all for polishing the paint, which produces next to no residue compared to the sanding (everything done outdoors btw with my 3M cartridge respirator). The Chemical Guys auto paint polish is probably too fine to be very effective on metal. And yeah, the aluminum in Cave's castings is not the modern stuff, no telling what's in it. I've been pretty careful about not doing anything that would make a lot of fine aluminum dust. Rocketry folks know that very finely ground aluminum (we're not talking machining chips here) is actually a viable propellant additive, and having a lot of it floating around is an *explosion* hazard. Powdered aluminum below a certain size is actually a regulated product because of that.
Another thing people should know about older telescopes is that lead based paint was not banned until 1978, near the very end of Cave Optical production. It's a fair guess that the original paint on many older mounts (Cave, Parks, Criterion, etc) would have lead content. A good reason to prefer the Citristrip, which doesn't throw dust into the air, vs wirebrush or sandblasting.