He's still doing MOT. He wants just slightly more depth. At 120 grit, it'll take about 10 wets to go .010. Brent --- David Dunn <david.dunn@albertsons.com> wrote:
Brent,
Should he do 5 wets with the MOT and 5 wets TOT or does he still need to deepen the curve?
Dave
-----Original Message----- From: Brent Watson [mailto:brentjwatson@yahoo.com] Sent: Friday, February 21, 2003 10:24 AM To: utah-astronomy@mailman.xmission.com Subject: Re: [Utah-astronomy] Mirrors
Jim,
Good progress. Your focal lengths will be within an inch of what your goal.
You have it right. After the 10 wets, inspect the DRY surface and make sure all the pits from the 60 are gone. You may have some small bubbles in the surface of the glass, but a couple of these are OK. Then carefully clean up and go on to the 220. We should have all the mirrors ready to start the 20 micron next Thursday.
--- Jim Gibson <xajax99@yahoo.com> wrote:
Brent
I was able to get my mirror down to .10175 and Scott's down to .1015 inches before I ran out of
60
grit. I was shooting for .102 for both of ours so I guess I am close enough. My sagita depth is .103 for an f7 and am hoping to reach that for both of our mirrors using the 120 grit. So I want to be clear on what I am doing. I was so worried about our mirrors being so far off I may not have the next step right.
I believe what I am supposed to do is about 10 wets with the 120 grit with a short stroke with about 2" exposed at the top and bottom of the stroke and extend the last 2 wets. If this isn't right please let me know. Thanks
Jim
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