Table of contents:
Introduction. Inspired by a storm warning.
step 1 Materials.
step 2 Score pieces of scrap glass.
step 3 Separate the pieces.
step 4 When you get good, switch to the mirror.
step 5 Conclusion.
There is no license. The reader can use this information as they wish.
Early in 2010, some NASA scientists predicted a solar storm to occur in 2012 or 2013. I decided to make a solar filter for my telescope and monitor solar activity. And, I thought, why not make notes and pictures to post on the web so everyone else can do the same.
I wanted a circular filter, a filter that I could mount to a screw-in front lens cap that came with my telescope.. so I started by studying an old October 1965 Popular Mechanics article on glass cutting called “All You Need To Know About Cutting Glass” by Walter E. Burton. Then, I set about working out a method and practicing with what I had on hand.
I didn’t want to use eyepiece projection because all that light and resulting heat is concentrated in the eyepiece. I had read that eyepieces can be damaged by the heat, with cemented lenses burning. I also didn’t want to use any eyepiece solar filters because there is said to be a danger of them cracking from the heat.
Here is a picture of the completed filter mounted on the telescope.
Step 1: Materials:
Photo A shows some of the tools you will need.
1. Piece of wood, plastic, or metal to use as a beam.
2. A “C” clamp to hold the glass cutter in place.
3. A suction cup to anchor the beam to the glass.
4. A nail or wire to connect the beam to the suction cup.
5. A set of milk crates or other platform to work on.
6. A piece of suitable “leaky” mirror.