Hi Dave, Yes, this possibly is the cause (or one of the causes) that the edge grinds faster then the center region but, I think, not that all grit is removed...
13391
Jerry
atc322asd
Mar 1, 2009 10:39 pm
And occasionally it is not that strokes are innocently being done incorrectly, but an aversion to doing it as others advise and has been shown to be...
13392
a
ak6666666
Mar 2, 2009 1:24 am
That too I like very much. Thanks Dave. There is hardly any relative motion in the central region. You are absolutely right there. ... From: zway2bisfancyfree ...
13393
a
ak6666666
Mar 2, 2009 1:25 am
Jan I think that your centrifugal theory hits the heart of the problem. Thanks man. ... From: Jan van Gastel To: atm_free@yahoogroups.com Sent: Sunday, March...
13394
a
ak6666666
Mar 2, 2009 1:31 am
You read my mind Jan. I thought my thinking was better but I was wrong. Plain wrong. ... From: Jerry To: 'Mel Bartels' ; atm_free@yahoogroups.com Cc:...
13395
a
ak6666666
Mar 2, 2009 1:36 am
Like Edison said: (cant recall his exact words) I will not say that I have failed a thousand times but that I have found a thousand ways that would result in...
13396
a
ak6666666
Mar 2, 2009 1:44 am
Jan don't punish me so much. :) ... From: Jerry To: 'Mel Bartels' ; atm_free@yahoogroups.com Cc: atm@... Sent: Sunday, March 01, 2009 2:39 PM Subject:...
13397
ghb959
Mar 2, 2009 1:00 pm
Hi Ali; You have to slow down this is not a race to work thru the grit! The first step you want to do as Mel and others have said you should work each grade of...
13398
a
ak6666666
Mar 2, 2009 4:23 pm
Hello Spent some time (3-4 wets) on 220 1/3 overhang. Edge dries quickly. Grabs mirror when near centre. Have to spray water on edge to keep things running. ...
13399
a
ak6666666
Mar 2, 2009 4:25 pm
Hello Spent some time (3-4 wets) on 220 1/3 overhang. Edge dries quickly. Grabs mirror when near centre. Have to spray water on edge to keep things running. ...
13400
Ken Hunter
atm_ken_hunter
Mar 2, 2009 4:31 pm
hi, i don't know who reported that, but it is a rumor!!! david is alive and well!! nancy enid cemetery manager ... From: ken.hunter <Ken.Hunter@...> ...
13401
Jan van Gastel
janvangastel
Mar 2, 2009 5:04 pm
Ali, With 1/3 overhang COC, the mirror's center will not reach the center of the tool or vice versa, because 1/3 overhang means 1/6 to both sides. So maybe...
13402
Ken Hunter
atm_ken_hunter
Mar 2, 2009 6:38 pm
From the symptoms I'm reading... Sticking when centered, large central bubble, I'm thinking he has a deep central zone in the tool remaining from the hogging...
13403
a
ak6666666
Mar 3, 2009 1:45 am
I also thought of vaccum creation near centre. I suspect that my mirror has a deep central zone, like a parabola and the tool is spherical. Will use 120 and...
13404
Jan van Gastel
janvangastel
Mar 3, 2009 6:57 am
Ali, You could do some TOT, with the same stroke (1/6 both sides, COC). This will work more on the edge zones then MOT. And when there's good contact again,...
13405
a
ak6666666
Mar 3, 2009 1:18 pm
Jan I am not concerned what focal length I finally end up with. I have no fised target in mind. My main and foremost concern is to get through grinding,...
13406
Jan van Gastel
janvangastel
Mar 3, 2009 1:34 pm
Ali, I meant that the edge of the tool should never pass the center of the mirror, or the edge of the mirror, when MOT, never passes the center of the tool....
13407
Jerry
atc322asd
Mar 3, 2009 1:49 pm
I think it would be best if you work only MOT for a while. If you use only the 1/3 COC stroke at each grade of grit, and work each of those grits for an hour...
13408
Ulhas Deshpande
dulhas2001
Mar 3, 2009 2:21 pm
Hi Will a telescope ( 6 inch) with uncoated primary and diagonal be safe for observing the upcoming solar eclipse? Thanks Ulhas...
13409
a
ak6666666
Mar 3, 2009 3:13 pm
As for me, I cannot look at even the reflected sun in water. ... From: Ulhas Deshpande To: atm_free@yahoogroups.com Sent: Tuesday, March 03, 2009 6:21 AM ...
13410
Tony Gondola
sailguy28
Mar 3, 2009 5:02 pm
I'm watching our progress in quiet frustration as you go round and round in circles. As I've told you before, what you really need to do is simple. Just work...
13411
tsulmer1
Mar 3, 2009 5:29 pm
My gut says "No". I wouldn't risk viewing the sun through a telescope (even one with uncoated mirrors) without a proper filter. I use Baader solar film. It...
13412
Vladimir Galogaza
vgalogaza
Mar 3, 2009 6:29 pm
Hi Ulhas, ... Solar filters (like Baader) for visual use reduce intensity of transmitted light 100000 times. (D=5, look in...
13413
talquence
Mar 3, 2009 11:46 pm
Re: [atm_free] Observing solar eclipse:uncoated optics One of the tests I use when nearing final figuring of my mirrors is to mount them in their tube and use...
13414
Ed Majden
bolideca
Mar 4, 2009 12:29 am
Ulhas: Never, never, do this, you will damage your eyes. Don't use a filter mounted on your eyepiece ether. Some inexpensive telescopes come with such...
13415
a
ak6666666
Mar 4, 2009 1:53 am
I once looked at a setting orange sun and although it was hurting me I went into a competition with it and what did I get? A permanent scar on fovea area of...
13416
a
ak6666666
Mar 4, 2009 1:56 am
I once looked at a setting orange sun and although it was hurting me I went into a competition with it and what did I get? A permanent scar on fovea area of...
13417
brock.family
debrock2
Mar 4, 2009 3:51 am
Ulhas, just to be clear. I'm sure Ed means for naked eye observation. Dave. ... From: Ed Majden To: atm_free@yahoogroups.com Sent: Wednesday, March 04, 2009...
13418
Krish R
ramacall
Mar 4, 2009 7:23 am
Hi i have ordered a solar filter pair for my 10/50 bino for around 900rs.one costs around 450 nearly.this willbe available from Nilesh of galelio in india with...
13419
Leandro
unievaspravda
Mar 4, 2009 11:12 am
Hello on september I ordered a 20" mirror from Discovery Optics (http://www.discoverytelescope.com/optics.html) with a estimatem delivery time of 60 up to 90...
