For those that have expressed interest in CCD work with a dob... (reposted with permission of Robert Sharp) Hi all, well, after 8 months of putting this...
It's a pretty small crowd that knows the original song. But the tune was running through my head so I thought I would attempt to get rid of it. Unfortunately...
I have just recieved a 25" mirror that I waited almost a year for and have a concern. The mirror maker said its no big deal but I never though that it was...
Hi All. I've got a newbie question for you. I just installed ebony-star laminate and three virgin teflon pads on my Meade Starfinder 16 dob. The pads were...
Sorry to hear such a story. I have had one recoat and two other new mirrors (one of which a 30") and have never heard of this. It seems unreasonable to have...
this is normal for some coaters (QSP did it)... I would be amazed if you really can see it in the star test. It should not show. This is no different than if...
Hi concerned, This is a common practice with large mirror makers do. You will not see this in viewing the cosmos. If you want to know the reason why, write or...
... mentioned that could happen when I orderd the mirror and I never saw a thread on it in the past. United Lens is a great company so Im sure they have their...
On the good scopes, the movement in any direction will be equal. Shimming the center pivot point was a good thing to do. You may also want to increase the...
Michelle, Thanks for the reply. Question--I've read that using non-silicon car wax is a decent way to further reduce friction on the laminates, but do not...
I use a silicon car wax -- Turtle Wax to be specific. If you use it, make sure to doubly wipe it off. I mean, really buff it clean. I can't tell you what I...
Hi Michelle. I think the turtle wax idea might work well as an additional mod. Simple, cheap, and effective. The teflon pads that I have are not etched, but...
... saw ... sure ... to ... asking. ... Seems this would not have any or very minor impact as I have 3 small mirror clips on the edge of the cell to retain my...
Matt, As one who has tried most everything I would say I am against adding lubricants. They usually end up getting dirty and this REALLY screws up the...
I just did a quick study on line about friction to refresh my knowledge because friction is a counter-intuitive phenomena unless you examine each component....
You are right, Jim. I forgot already! :-) Charlie ... From: Jim Chandler To: bigdob@yahoogroups.com Sent: Tuesday, August 03, 2004 6:06 PM Subject: [bigdob]...
Whether you have clip marks or not really depends on the coating method. Some chambers require that the mirror be suspended face down over the coating source....
Ok, I've just re-read your email and see something I glossed over originally. You say there are a total of three, 1/2" x 1" marks. I originally read that as...
... knowledge because friction is a counter-intuitive phenomena unless you examine each component. Do a Google search on [sliding friction formula] and read...
That is true. CS ... From: Gary Myers To: bigdob@yahoogroups.com Sent: Tuesday, August 03, 2004 7:28 PM Subject: [bigdob] Re: Azimuth motion ... knowledge...
we're making progress... photo in the photo section. We will soon have the observatory open. If your visiting SE AZ... for "scope rentals" at a reasonably dark...
Hi gang. I reread chapter 10 of Kreige's book last night, and found that indeed, I should have used glassboard instead of Ebony with a behemoth weighing over...
Lowes and Home Depot carry it in Charlotte. There are several manufacturers of it. Look for the one whose bumpy raised surface is not oriented in one...
My local Lowe's carries it here in Central California as well. I don't use it because my scopes don't weigh all that much. Michelle Stone Argo Navis and ...
Using a larger alt bearing won't necessarily raise the bottom of the tube, if the side boards are re-sized appropriately. -John John, I may have been unclear...
Matt, Your logic sounds good to me and was one of the key design features of the K&B dob design - big trunions and a short, stiff rocker box. Personally, if...
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