This is a beautiful project. I really want to know more. The story sort of stops at drilling the center hole of the primary. Have you done more since?
It must be incredibly difficult to make a short focal ratio primary mirror hyperbolic like that. Is your Ritchey Chretien going to have a longer tube than usual so your mirrors can be more flat and aberrations become less noticable?
Do they make air powered grinders you could use to do this. Using an electric grinder while standing in a puddle of water increases your likelyhood of electrical shock.
Isn't ground glass poison? (Don't eat it in case). Talk to those CNC guys - they could automate that stuff - it'd take all the hours of fun out of it though
Yes, glass dust is a very dangerous stuff! That's why I grinded "under water". My additional breathing protection literally scared the cat away ;-) You'll find an image on my blog (see a link in the description of this video)
@otterstedt I'll never forget this, my mom's friend when I was younger came over in agony and I guess she had done a little cocaine, her sinuis' were black and blue on the outside, she could hardly breath, and was in total complete agony. I remember my mother taking her to the hospital and she actuall had to have surgery to have it cleaned out. Turnes out she had got into somebad cocaine and the primary ingrediant was Glass! She had mercury poisining or something similar. Bad stuff glass LOL.
Hi qwerty9321, the tool I used is based on grit. I've got one of these diamond tools as well, but I was a bit afraid of going to deep ;-) So I used the "slow" tool.
Argh, my comments don't show up. Hope this one does ;-) I think the tool is called cap washer or cup washer in Englisch. In German it's called Topfscheibe.
Interesting. I notice that you are working on the ground. Might a table be useful? How is your project coming along now?
foreilly1958 1 year ago
This is a beautiful project. I really want to know more. The story sort of stops at drilling the center hole of the primary. Have you done more since?
musherX 2 years ago
It must be incredibly difficult to make a short focal ratio primary mirror hyperbolic like that. Is your Ritchey Chretien going to have a longer tube than usual so your mirrors can be more flat and aberrations become less noticable?
joshig1983 3 years ago
Do they make air powered grinders you could use to do this. Using an electric grinder while standing in a puddle of water increases your likelyhood of electrical shock.
myronww 3 years ago
Isn't ground glass poison? (Don't eat it in case). Talk to those CNC guys - they could automate that stuff - it'd take all the hours of fun out of it though
OghamTheBold 4 years ago
Yes, glass dust is a very dangerous stuff! That's why I grinded "under water". My additional breathing protection literally scared the cat away ;-) You'll find an image on my blog (see a link in the description of this video)
otterstedt 4 years ago
@otterstedt I'll never forget this, my mom's friend when I was younger came over in agony and I guess she had done a little cocaine, her sinuis' were black and blue on the outside, she could hardly breath, and was in total complete agony. I remember my mother taking her to the hospital and she actuall had to have surgery to have it cleaned out. Turnes out she had got into somebad cocaine and the primary ingrediant was Glass! She had mercury poisining or something similar. Bad stuff glass LOL.
IcechickenSr 1 year ago
Both have a front-corrector (Lens at the front end of the tube). Normally the corrector of the Schmidt Cassegrain is thinner.
BTW: What I'm working on, is a Ritchey Chrétien Cassegrain without a front corrector ;-)
otterstedt 4 years ago
otterstedt said: "What I'm working on, is a Ritchey Chrétien Cassegrain without a front corrector"
What do you mean by not having a front corrector? You mean you aren't having a corrector lens plate because Ritchey Chretien doesn't need one, right?
joshig1983 3 years ago
Hi qwerty9321, the tool I used is based on grit. I've got one of these diamond tools as well, but I was a bit afraid of going to deep ;-) So I used the "slow" tool.
otterstedt 4 years ago
This tool is based on diamond or grit ? I use to make this way also, but use these cheap diamond saws used to cut ceramic floor instead. Nice !
qwerty9321 4 years ago
Argh, my comments don't show up. Hope this one does ;-) I think the tool is called cap washer or cup washer in Englisch. In German it's called Topfscheibe.
otterstedt 5 years ago
HEY, what tool are you using?
fredastaire1 5 years ago