attendees: TimC, TomW, JerryW, TomT, DmitriiZ (+J)
TW- 8” “richfield” scope reviewing w/ JW. Knife edge error 4zone chart compared to theoretical, in cm, see photo of chart. Someone in the Chabot group made this chart http://www.chabotspace.org/telescope-makers-workshop.htm.
TW- then went over his parabolic vs. circular mirror making mathematics that he will be presenting at the Westmont College Summer Science Institute http://summerscience.org/home/index.php with JW as well. TT was mostly baffled by it all.
TC- working on cleaning off old pitched tool glass for mirror that Javier gave him. He plans on making the f8 glass into a faster mirror (f5?). He will grind the existing 8” mirror deeper by making a new tool from the old, with new tiles adhered on it. JW recommends using tool glass directly to grind with, but with good bevel. No channels needed for grinding material. Tiles may actually be dangerous due to each tile's sharp edge that can break off. Some people cut tiles to fit tool, others only leave full tiles that fit on tool. TimC continued to bevel the 8” tool and his 16” mirror, which is still at the grinding stage.
TT- showed Newport glass mirror kit cost list, and TW/JW commented on increasing cost http://www.newportglass.com/ngwkitp.htm.
DZ- dropped in to stay in touch with the group and while on babysitting duty. TT noted that he had started to review DZ's mirror making blog going back to 2009 (see link).
More photos here: http://www.flickr.com/photos/27241501@N03/sets/72157634222053744/
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