Telescope Polishing- Update

Almost polished mirror

Almost polished mirror

As you can see, the mirror is polishing pretty good but it is taking a long time to do, they weren’t lying when they said rouge is really slow, not to mention incredibly messy.  The large grey mass is on the back of the mirror- I got careless during the 3rd grade of abrasive and accidently set the mirror down face up. See post (here). All of the scratches you see are on the backside of the mirror.  Also, after repeated “cold pressing” sessions, the mirror refuses to polish from the center to the edge.  I have heard of this before, and it usually causes a turned edge.

polished

As you can see above, the area in the middle is not polished yet.  This is often hard to distinguish from the ground surface on the back, but at the right angle, I can see it.  I was lucky enough to capture it in the picture.

Unfortunately, the lap in the previous post was ruined by dropping it, I am reckless sometimes.  Then I made a new lap, and let it sit too long after pouring it and it hardened before I could put in the curve.  The next lap polished a lot and then, for some reason, the lap started to crack around the edges.  It eventually came off so now I have to make another lap.  The books don’t lie, polishing with rouge and pitch are not easy.

Rouge

Up close with Rouge and the polishing process.

Polishing operation, as always covered with Rouge

Polishing operation, as always covered with Rouge

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