On the viewing side? It's ground on by going over, and over, and over, and over it with a lap and honing compound. Because the glass wears so slowly, and the blank is constantly rotated, error even themselves out to very little. Huge mirrors are spun as their molten to get the curve roughly right, then polished. They also have actuators at the back to correct for any remaining errors and heater to get it all the same temperature.
I tried this a few years ago using a propane-fired kiln and borosilicate glass. Unfortunately the roar from the kiln was so loud that the neighbors called the police who thought I was running a methamphetamine lab and came VERY close to shooting me before I could explain.
At any rate, it worked and I still have the mirror blank.
That awsome thanks for posting this video. I was wondering how they made telescope mirror's. Btw what is the size of this thing ? It looks huge like 20" +
Hey guys! Great videos! I am basically doing the same thing you guys are doing, although my shop is a little more ghetto than yours! Have you thought of putting the kiln on some type of rotator to pre-generate whatever sagitta you guys are trying to achieve? Same way the big-boys do it! Again, thanks for the vids!
I have no Idea what you just did, anyway I use the grinding method ,by the way,How do you what do you use Vacuum chamber aluminum or silver bath ,I'm really having trouble using silver bath and I was looking a method to build a vacuum chamber with the tungsten and all that stuff..
We flat stack pieces of glass that are from the same family, from one piece of glass. We heat the oven to over 1750 degrees and hold it between 6 & 8 hours. We quick cool it to the akneeling point depending on the thickness of the glass.
Do you sell glass blanks for Telescope mirrors.
say 200mm x 34mm thick.
homersparents 3 months ago
Could you tell something about the construction of the oven itself?
JustWonderingHowToDo 5 months ago
"How do u make curve?"
On the viewing side? It's ground on by going over, and over, and over, and over it with a lap and honing compound. Because the glass wears so slowly, and the blank is constantly rotated, error even themselves out to very little. Huge mirrors are spun as their molten to get the curve roughly right, then polished. They also have actuators at the back to correct for any remaining errors and heater to get it all the same temperature.
lexichronicle2 7 months ago
Hi Guys, I like the furnace. How much nichrome wire is that? What's the wattage?
Cheers!
evildrome 11 months ago
Where and what are the raw glass materials ?
JoeGancher 11 months ago
Really impressive muffle ! What is the working temperature so that the soda lime glass starts to melt ?
pedrocosmos 1 year ago
I tried this a few years ago using a propane-fired kiln and borosilicate glass. Unfortunately the roar from the kiln was so loud that the neighbors called the police who thought I was running a methamphetamine lab and came VERY close to shooting me before I could explain.
At any rate, it worked and I still have the mirror blank.
pupplesan 2 years ago 9
@pupplesan Glass is a terrible drug.
genesisharmonicas 1 year ago
That awsome thanks for posting this video. I was wondering how they made telescope mirror's. Btw what is the size of this thing ? It looks huge like 20" +
1ownjoo2 2 years ago
How do u make curve?
DirtyThing20 2 years ago
@DirtyThing20
LOTS of grinding. or a really special mold. which takes lots of grinding.
Dierwolf2000 1 year ago
Hey guys! Great videos! I am basically doing the same thing you guys are doing, although my shop is a little more ghetto than yours! Have you thought of putting the kiln on some type of rotator to pre-generate whatever sagitta you guys are trying to achieve? Same way the big-boys do it! Again, thanks for the vids!
Messiermarathon 2 years ago
Great video, can anyone help find some info on how to build one like this.
Thanks.
compusci 3 years ago
I have no Idea what you just did, anyway I use the grinding method ,by the way,How do you what do you use Vacuum chamber aluminum or silver bath ,I'm really having trouble using silver bath and I was looking a method to build a vacuum chamber with the tungsten and all that stuff..
antichavista1000 3 years ago
does regular glass turn to lens or is the mold specualy made
narcovice 3 years ago
We flat stack pieces of glass that are from the same family, from one piece of glass. We heat the oven to over 1750 degrees and hold it between 6 & 8 hours. We quick cool it to the akneeling point depending on the thickness of the glass.
xFrogsharkx 3 years ago
Thanks for putting up the videos! I am planning to setup my own mirror making setup in Bangalore, India. Your videos are sure helpful!
Cheerio,
Sreejith
sreejithsreedharan 3 years ago