... I have a 13.1" blank 1.5" thick that I want to trepan and grind into a ... That blank may be a bit thin for a conical end state, but check out: ...
Thanks Guys, This is an area that could use some thoughtful work. I'd need to abandon the floatation cell for the much simpler center support. The weight may...
That is indeed the truth, but for practible purposes, when you take two thick pieces of glass and rub them together, you aren't going to be worrying about...
Tracy, Conical mirror blanks usually start out with a little more center thickness. Shallow conicals have little additional strength over standard plane...
Please see: http://overton.tamu.edu/aset/krajci/ specifically: http://overton.tamu.edu/aset/krajci/binaries/binaries.htm After you build your telescope, CCD,...
Hello All After my last post I worked on the centre and 85% zone with a tool of 60mm dia for about 10 mins and 5 mins resp. After washing and resting for about...
What is the absolute maximum ratio of air/gas/vacuum to glass in stable self supportive lightweight blanks? To frame the question, can a stable blank be made...
... MOT to ... then ... Ulhas, Please post your photo's to the GROUP's photo section... Yahoo does not keep them with the messages now and we are not able to...
New to the group so my request might be a little basic but maybe someone can help. I am looking for the threaded inserts for the struts as described in the...
www.mcmaster.com ... From: Bill Gnirrep To: Amateur Telescope Makers Sent: Saturday, December 06, 2003 2:08 PM Subject: [atm_free] Source New to the group so...
Just finished silvering a six in mirror. It turned out fairly nice based on what appears to be the experence of others. That is with one exception. The...
Hi Bill look here: http://www.4gabriel.com/threadedinsert.html Or try www.google.com : threaded inserts Cheers Petr DB ... someone can help. ... the book...
Hi, On the atm list last week or so there was a thread on interferometers and it focused on the Ceravolo type of Fizeau. This reference element used is rather...
Somebody needs to do a good page on interfrometers and how to set them up and about how much they will cost. There are some pages that have promised such but...
Ric, ... If this is correct it will not be difficult for us to make one, unless it should be 1/n wavelength accurate where n is some big number. And...
... mentioned ... unless it ... Yes,these are good questions,but making a sphere is - using ronchi grating is a lot easier to achieve to at least 1/10 wave. ...
... mentioned ... unless it ... Yes,these are good questions,but making a sphere is - using ronchi grating is a lot easier to achieve to at least 1/10 wave. ...
Ric, As expected recently published interferometry analysis programs by David Rowe and Michael Peck led inevitably to increased interest in the 'whole mirror...
... telescope ... in optics ... suitable ... available to the ... interferometer. ... cheaper but ... Well,there is an illustration in TM #32 or so that shows...
Greetings All, Well today was interesting :) I'm currently working on Re-figuring Charlie's 12.5" F4.5 optic, which I had recently done interferometry on while...
Don, \ Is there any news on your moving cage focuser? I am looking into a sled focuser for my 13.1" dob. Your idea sounds very interesting. Regards, Rob ... ...
... Merv, Congratulations on your first silver coating! Now, the brownish (perhaps brown-greenish-white?) glow is probably the begining of "bloom". If so, no...
I have not built one but the other day I dismantled a couple of cd rom drives to check out the gears and motors and the slide mechanism that drives the laser...
I managed to find a used slide assembly, with a precision 1/4"-25TPI lead screw. It has a little backlash but is smooth and solid. It has 6.5" of linear...
Not yet. The Clement Focuser is available and has an ultra-low profile of one inch with three inches of travel. Other than backlash and wear compensated...
Ric With a bit of research you can find lots of different designs for interferometers. All except shearing type will work with Dave Rowes soft ware. The Fizeau...
... love ... The secondary has to travel with the focuser, so it needs to be on a stalk or something similar, making collimation possibly more difficult; also,...
I think a good secondary support is the most challenging part of the effort. The sled design would lend itself nicely to motorized control. Rob ... a ... move...
