Hello During some wets I see a central place which is clear and without grit. It is filled with water. Does this mean that I didnt place enough grit?...
Did you spread the grid out over the mirror, by 'swirling' the mirror around from time to time, especially at the beginning of a wet or after adding new grit? ...
What I meant was how long do you use the pads? How long does it take to get the initial polish with them? Robert ... the ... to the ... might ... on the ... ...
Yes Sir. This clear circular or irregular region (2-3 inches in dia) develops when I am more than half way through the wet. Little clear patches join up to...
Yes Sir. This clear circular or irregular region (2-3 inches in dia) develops when I am more than half way through the wet. Little clear patches join up to...
I cannot break up this clear region. It remains intact even if I swirl. The only way to make it vanish is to slide the mirror more than 80% off the tool. ... ...
My strokes are unlike yours. I don't use COC 1/3 overhang. Picture this.... With MOT, centre of mirror traces out a 1-2" dia circle over centre of tool in...
... Your observing reports are very enjoyable. It sounds like you have found a very knowledgable group to observe with and very hospitable as well. I also...
I like your replies but they are few. Maybe I like your name or something. ... From: Jan van Gastel To: atm_free@yahoogroups.com Sent: Sunday, March 01, 2009...
Maybe these two clockwise movements, cause the grit to move from the center in the direction of the edge. You could test this by doing a couple of wets COC...
Thanks a million Dave! You don't know how happy I get when someone likes my star party accounts and expresses it. This fuels me. I am so thankful to you A ... ...
Very good reasoning. I will try COC. Thanks. ... From: Jan van Gastel To: atm_free@yahoogroups.com Sent: Sunday, March 01, 2009 7:11 AM Subject: Re: Re:...
This is causing unequal grinding of edge and centre. I might have to discard it and adopt COC 1/3 overhang. Edge become smoother quickly while centre still...
I just finished grinding an 8" f/4 (will start polishing tomorrow) and had very good results with COC, 1/3 overhang MOT and TOT. TOT twice as long as MOT for...
Jan you are my hero. You put me on the right path. I can already see M42 in my eyes. COC 1/3 is working miracles. Now the question in my mind is, should I move...
If the pits are really large and you are sure they are from grit 80, it could be faster working when going back to 220. But if the pits are made by 220 grit...
Jan you are my hero. You put me on the right path. I can already see M42 in my eyes. COC 1/3 is working miracles. Now the question in my mind is, should I move...
Initial polish in about an hour, deep polish in about 4. Tony ... From: "Robert" <robt2112@...> To: <atm_free@yahoogroups.com> Sent: Sunday, March 01,...
3 wets have made the area around the central pits as smooth as the edge area. I am seriously considering moving back to 220 or 120. The smoothness is 50-100...
What was thickness of your mirror and tool blanks? Did you use ring/plaster tool? Worked only with hand or used a machine? Mirror was flat or had an initial...
What was thickness of your mirror and tool blanks? Did you use ring/plaster tool? Worked only with hand or used a machine? Mirror was flat or had an initial...
The thickness is 25 millimeters. My tool is a plaster tool with small glass tiles, and about 40 mm thickness. I work only by hand and the mirror was flat when...
Invariably the biggest issue in mirror making, particularly from those starting on the journey, those isolated from others, is the grinding strokes. 99% of the...
They are 8 mm thick and 15.5 mm diameter. In have also used ceramic tiles of the same size and (for another mirror) a bit larger. Both (glass and ceramic work...
That's an excellent idea Mel........ Tony ... From: Mel Bartels To: atm_free@yahoogroups.com Cc: atm@... Sent: Sunday, March 01, 2009 10:25 AM Subject:...
... wrote: It is not the grits migrating out towards the edge but rather the fact that the circular motion causes more surface area to concentrate on the edge...
I'm probably not the first to think of this, but the everyday ordinary round balloon makes a wonderful eyepiece protector. I just cut off enough of the small...
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