Also, a part of the surface of the mirror would be wasted. To this add a pinch of polishing grit, Cerium Oxide or Tin Oxide or Tripoli, whatever you decided to use (See [Grit]. The slot should only be as wide as three or four pieces of the strip material you are using. Now we need to consider the second half of the optics, the secondary mirror. Its surface must be durable enough to survive the grind, Search the world's information, including webpages, images, videos and more.

The tubing used can be plastic or metal or cardboard. I squoosh it around until the base is covered and then I center the pie plate A common practice is to mark the bigger holes with a Sharpie and grind the surface until all of them are gone. The focal length is set by the shape of the curve in the front of the main mirror. is shaped by cutting one end at a 45 degree angle. A second issue with the Newtonian telescope is that it is by design quite powerful. There is really not much more I can tell you. My first--I called it the Long Dog--had a truss design that took about five minutes and 10 bolts to set up.

The ball has some radius, the distance from the center of the ball

is the distance at which it brings incoming light to a focal point, or simply focus. This will use the grit efficiently and there is plenty of grinding ahead to correct errors. The secondary mirror is usually an oval shape, but may be rectangular. But what if you want to use paper? A 1-inch secondary mirror that is one inch wide by about 2 inches long with an oval shape.

The grit tumbled along between the two surfaces, chipping off little bits of glass as it rolled along. Consistent drag will be absent. If it is bigger than the mirror, it will make a flatter curve and increase the focal length.
and can be found for pennies on the dollar at thrift shops. =

We will switch to Aluminum Oxide. The truss is held to the box with 4 bolts. The pull back should use the whole 1001. Another solution is to do all polishing using a slightly oversized lap as described here: After I completed the 14.5 inch mirror I tried such laps on other mirrors and they do work. This is a great test to use on a full moon. Pasted to one of the elevation bearings in the photo above is a sheet of paper with elevation marks (0 to 90 degrees).

A board is a good thing in that it allows me to pick up the whole mess and move it to storage when I am not grinding. If everything else looked good then we need to move to a more delicate test. Same goes for musicals into movies. The reason you keep smearing the polish around is that it puts a coat of polish and water on your fingers so the pitch or wax doesn't stick to them. It was a perfect night, calm sky, dark, Saturn was high. Plastic plumbing pipes for sink drains: these are usually 1.5 inches or 1.25 inches inside diameter. If you are using your grinding tool, wash it, dry it well and dust it off with a stiff brush. That is why figuring is also called _correcting_ the mirror. to rinse the mirror and tool in.
(How far away is "infinity"? It also gives us a ready made grinding gauge to check our progress. I had this problem a lot when I first started to grind pie pans. Pull. at least in the coarser stages. On occasion, I have to readjust the tubes in the cage truss clamps as they slightly shift over time causing the cage to no longer be parallel with the mirror box.


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