I've been working on that 10" f8 Mirror and have got rid of the overcorrection using 1/4 dia. strokes. I now have an oblate spheroid with turned down edge,...
19071
William Samson
willsamson
Aug 3, 2011 5:05 pm
I forgot to mention - On the foucault pic the knife edge is coming in from the right. Bill...
19072
Jerry
atc322asd
Aug 3, 2011 5:12 pm
Hello Bill, I was wondering how you were doing with the mirror. Center over center strokes tend to cause the zones. Adding some W motion to the stroke lessens...
19073
Jerry
atc322asd
Aug 3, 2011 5:23 pm
Bill I should have mentioned that it would be good to have a picture of the lap itself and if the mirror is clear glass, a picture of the lap with the mirror...
19074
William Samson
willsamson
Aug 3, 2011 7:24 pm
Here's a photo of the mirror and tool as you suggested, Jerry. http://media11.dropshots.com/photos/224074/20110803/192239.jpg My usual working temperature is...
19075
Jerry
atc322asd
Aug 3, 2011 9:10 pm
Hello Bill, I hope Starman Paul will offer some of his wisdom here. I have not found much good coming from mixing beeswax into pitch. I have tried it but I...
19076
William Samson
willsamson
Aug 3, 2011 10:23 pm
Gugolz? That doesn't seem to be available in the UK, where I live. The two UK suppliers simply specify 'best pitch' or 'optical pitch' - which isn't...
19077
Jerry
atc322asd
Aug 4, 2011 12:11 am
Hello Bill For me at about 1/4” the lap is about finished. At 3/16” I am quite sure you will have problems. In fact now I must consider that your pitch...
19078
William Samson
willsamson
Aug 4, 2011 7:38 am
Thanks Jerry, I hadn't realised that 3/16" was too thin. A new lap it is. [Oh dear - back to pitch getting everywhere. My wife WILL be pleased . . .] ...
19079
art.bianconi
Aug 4, 2011 8:44 pm
I need a computer controlled kiln with a large enough chamber to fire mirrors up to 24 inches in diameter. It needs to be programable and must be wired for...
19080
starguy@...
gregfurtman
Aug 5, 2011 2:14 pm
Art, Try http://www.pottersweb.net/index.php?ad&cat=equip Remember that used kilns don't travel well. Pretty fragile. Greg Furtman 27426 County Rd H Webster,...
19081
art.bianconi
Aug 6, 2011 1:57 am
Perfect site Greg! I'll place an ad next week. Thanks! Art ... 2000 degrees F ... mirrors up to 24 inches in diameter. It needs to be programable and must be...
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Guy Brandenburg
gfbrandenburg
Aug 6, 2011 2:47 pm
Really sad news. One of the guys who's been working diligently in our workshop on an 8"f/5 mirror had an irretrievable disaster yesterday as he was taking his...
19083
Jerry
atc322asd
Aug 6, 2011 3:46 pm
The only good answer as a way to get over the bad feeling is to get another blank and go back to work. Having had a lens clumsily destroyed after much work, I...
19084
peter de baan
pdebaan
Aug 6, 2011 3:51 pm
Sorry about that,aparently you have no rubber workplace mats on the floor to avoid such accidents Peter...
19085
William Samson
willsamson
Aug 6, 2011 4:21 pm
Never mind. I'm sure it will go quicker second time around. Bill From: Guy Brandenburg <gfbrandenburg@...> To: atmlist <atm@...> Cc: atm...
19086
Peter
peterpekurar
Aug 8, 2011 11:05 pm
Hi, For anyone interested here’s a short update on the progress of my 24” mirror. I finished polishing the mirror about two months ago. Polishing machine ...
19087
Richard F.L.R. Snashall
rflrs2000
Aug 9, 2011 12:01 am
From all the information I was able to glean: In a few days, my web site http://mysite.verizon.net/rflrs will be coming down. If anyone wants to get a copy of...
19088
art.bianconi
Aug 10, 2011 1:17 am
You are not alone Richard~! My pulse quickens just thinking about them Art ... coming...
19089
art.bianconi
Aug 10, 2011 1:28 am
Peter wrote: " Hi, For anyone interested here's a short update on the progress of my 24" mirror. And a great report it was too. Thanks for posting it Peter! ...
19090
majorobs14
Aug 14, 2011 5:09 pm
Hi group, Has anyone devised a system to move an ota back & forth on a dove tail plate using some kind of SCREW device? If so,, I would love to hear about it,...
19092
art.bianconi
Aug 14, 2011 7:04 pm
John asked: "Has anyone devised a system to move an OTA back & forth on a dove tail plate using some kind of SCREW device?" A lot depends on just how much...
19093
jacques
suppjos
Aug 14, 2011 7:25 pm
I used also voice couil BUT it come from old hard diskk about 14 inch one from mini computer the couil is about 6 inch wide and 5 inch hight the couil iss...
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Francis Smith
smithgene69
Aug 14, 2011 9:21 pm
I have had it with a top heavy scope balanced on a pod. Am ready to do a Gimbal mount. Would a balanced mount solve most of your problems? Gene...
19095
John
majorobs14
Aug 15, 2011 12:13 am
I am looking for a way to easily fine tune the balance of my scopes on my HGM-200. I mount a 7.1" F9 APO and a C-14 side by side, and they are extremely heavy...
19096
art.bianconi
Aug 15, 2011 9:42 pm
Gene wrote: "I have had it with a top heavy scope balanced on a pod. Am ready to do a Gimbal mount." Me too Gene! Except for that replication of a 55 year old...
19097
tucstargzr
Aug 15, 2011 10:25 pm
FWIW, have you considered using electric Linear Actuators? I realize they are more expensive than, say, 1/2 inch bolts and coupling nut but considering your...
19098
John
majorobs14
Aug 16, 2011 5:02 am
Hi Tom, Thanks for the reply. I don't need remote capability, and want to keep it as simple as possible. Maybe some kind of "threaded rod" setup. ...
19099
art.bianconi
Aug 16, 2011 10:10 pm
It appears that there are two issues here: 1. I am looking for a way to easily fine tune the balance of my scopes on my HGM-200. and 2. there is the danger of...
19100
John
majorobs14
Aug 17, 2011 2:12 am
Hi Art, Thanks for the suggestions. I basically only to balance between a dslr mounted at the cassegrain focus of the C-14 or the back of the refractor, and it...
