http://tech.groups.yahoo.com/group/atm_free/ Amateur Telescope Making Fri, 20 Nov 2009 02:08:49 GMT zway2bisfancyfree http://tech.groups.yahoo.com/group/atm_free/message/14805 http://tech.groups.yahoo.com/group/atm_free/message/14805 Hi Berthold, Nice video and yes much better spin in this lap action. It looks like the ZOC method of figuring. You have about the correct turntable to Thu, 19 Nov 2009 21:52:55 GMT Berthold Hamburger http://tech.groups.yahoo.com/group/atm_free/message/14804 http://tech.groups.yahoo.com/group/atm_free/message/14804 It was a sphere once ;-) and is being corrected for a parabola. -- Berthold Hamburger - Cellist/Spain Email: behambu@... http://www.artinso.com Thu, 19 Nov 2009 19:49:20 GMT rwiederrich http://tech.groups.yahoo.com/group/atm_free/message/14803 http://tech.groups.yahoo.com/group/atm_free/message/14803 What correction are you attempting to do? Is the blank a sphere yet? Rob Thu, 19 Nov 2009 02:58:53 GMT tucstargzr http://tech.groups.yahoo.com/group/atm_free/message/14802 http://tech.groups.yahoo.com/group/atm_free/message/14802 Wouldn't mind helping dave if there's something going on. Tom Mon, 16 Nov 2009 19:09:16 GMT Berthold Hamburger http://tech.groups.yahoo.com/group/atm_free/message/14801 http://tech.groups.yahoo.com/group/atm_free/message/14801 Hi, I just uploaded a new video to youtube showing different offsets in an attempt to push correction to the edge. It is interesting to observer the swirl Mon, 16 Nov 2009 12:39:04 GMT Thomas Janstrom http://tech.groups.yahoo.com/group/atm_free/message/14800 http://tech.groups.yahoo.com/group/atm_free/message/14800 Dominic-Luc, I know you have had problems dealing with PP in the past, which was why I said I know that it's not a perfect option, but it's the one that is Mon, 16 Nov 2009 12:37:18 GMT Berthold Hamburger http://tech.groups.yahoo.com/group/atm_free/message/14799 http://tech.groups.yahoo.com/group/atm_free/message/14799 Ulhas, The tool is offset gradually during sessions according to the figuring examples of Carl Zambuto to take correction to the edge. Range is aprox. from 6mm Mon, 16 Nov 2009 09:16:25 GMT Thomas Janstrom http://tech.groups.yahoo.com/group/atm_free/message/14798 http://tech.groups.yahoo.com/group/atm_free/message/14798 Vladimir, I'm quite happy to do the coordinating, but as I'm in Australia and you're in Hungary, we'd have to find someone a bit more local to do the honours a Mon, 16 Nov 2009 06:40:49 GMT dulhas2001 http://tech.groups.yahoo.com/group/atm_free/message/14797 http://tech.groups.yahoo.com/group/atm_free/message/14797 Thanks Berthold Wonderful Video Are you doing C-O-C o r is the tool offset for deepening the center? Ulhas Sun, 15 Nov 2009 22:45:54 GMT Berthold Hamburger http://tech.groups.yahoo.com/group/atm_free/message/14796 http://tech.groups.yahoo.com/group/atm_free/message/14796 Hi Dave, Thanks for your input! Most likely a bit overpressed. However, contact is very good and as someone on another group mentioned that could be also the Sun, 15 Nov 2009 21:40:19 GMT zway2bisfancyfree http://tech.groups.yahoo.com/group/atm_free/message/14795 http://tech.groups.yahoo.com/group/atm_free/message/14795 Hi Berthold. It looks like you have about the right ratio of stroke to turntable speed which is good for figuring but the lap should spin close to the Sun, 15 Nov 2009 15:27:08 GMT Berthold Hamburger http://tech.groups.yahoo.com/group/atm_free/message/14794 http://tech.groups.yahoo.com/group/atm_free/message/14794 While the lap has to rotate during polishing, it is not supposed to do so during figuring. Turntable and eccentric speeds are reversed for figuring, so TT Sun, 15 Nov 2009 15:15:37 GMT Idle-Tyme http://tech.groups.yahoo.com/group/atm_free/message/14793 http://tech.groups.yahoo.com/group/atm_free/message/14793 PRETTY COOL, BUT I WONDER ABOUT THE LAP NEVER ROTATING IF THAT IS EFFECTING ANYTHING? JOE *The Original Rolling Ball Clock http://www.idle-tyme.com* Sun, 15 Nov 2009 11:38:03 GMT Berthold Hamburger http://tech.groups.yahoo.com/group/atm_free/message/14792 http://tech.groups.yahoo.com/group/atm_free/message/14792 Hi, I uploaded a new video to Youtube that shows my M-O-M while applying figuring strokes: http://www.youtube.com/watch?v=Vmi3FOs4Zwg Regards Berthold -- Sun, 15 Nov 2009 07:04:36 GMT Vladimir Galogaza http://tech.groups.yahoo.com/group/atm_free/message/14791 http://tech.groups.yahoo.com/group/atm_free/message/14791 Richard, ... Phase Shifted Interferometry with Bath interferometer aka "PSI-Bath". Much simpler, faster and more accurate than Foucault with Couder mask.