Would you mind repeating somewhat the same stuff here as over on CN about your cellular blank experiences to date, this time with all the juicy details?
Also (I graunched my upper back running today and I'm thinking I'm going to be experiencing severe boredom pretty soon :( ) what's your application with the 14.5" f/2.6 (that's a darn short tube at 38")?
Also (yes there's more!) would you be interested in working with and/or weighing in on the prospects for lightweighted fused silica at 20" and above? Greg at Superior Optical has been collaborating with me for some time in developing a practical fusing approach to build up his tons of 11-7/8" stock into as large as the market could use. I'm expecting to get the first 10" sample piece (was sawed in half, then ground flat to 320, then will be fused with a procedure involving silicate deposition at a pH of about 12) sometime within a week to prove out the technology with a finished mirror. I started thinking about building a CNC machine to do lightweighting of 20x1.5" blanks after schlepping around a 20.25x1.7" f/4 quite a bit ;) , the CNC generator I was planning could be extended to this purpose. Greg suggests he have the fab plant from where the fused silica originates as surplus use their current excess shop capacity to turn out one the quick way, in time to show at the Oregon Star Party. I'm into that!
--- In email@example.com, "Mike Lockwood" <parabola30@...> wrote:
> I know I haven't posted anything for a while, but I tend not to unless I have something substantial to say. I'm also staying quite busy making sub-F/4 mirrors.
> I hope the corrector debate/design continues, and I look forward to putting one in my 20" F/3 scope and my 14.5" F/2.6 scope (should be done later this year).
> Another very interesting development has been the creation of another company that makes engineered cast cellular mirror blanks:
> I continue to field questions about 32"+ mirrors. Yes, I have a source for monolithic Pyrex in these sizes, and yes, new substrates are making their way into the supply chain. Though prices will no doubt be a bit higher, I am fairly sure that quality monolithic mirrors up to 42" (and cast cellular up to 50") will be available in the future from Lockwood Custom Optics.
> Mike Lockwood
> Lockwood Custom Optics