Stiction: http://en.wikipedia.org/wiki/Stiction It is not a term used, in my experience, by physicists, so I would not expect to find it in their reference...
21704
Tim Ulmer
tsulmer1
Aug 8, 2012 4:52 pm
Ahh. Engineering. I had some engineers in my physics classes. ;) Tim ________________________________ From: atm_free@yahoogroups.com...
21705
S. Kent Blackwell
kentblackwell
Aug 8, 2012 5:07 pm
And, I always wondered if "light-pollution" might better be called, "dark pollution"? Kent Blackwell ... From: Mark Christensen To: atm_free@yahoogroups.com ...
21706
art.bianconi
Aug 9, 2012 4:13 am
I use a sheet of low durometer Absorbathane on my mirror turntable or deep pile AstroTurf. There was enough compliance with either one to support a 14 inch...
21707
art.bianconi
Aug 9, 2012 4:29 am
Michael wrote: "Polyurethane glues expand as they cure...to a great degree" That's accurate Guy and if you spray water on the parts to activate the glue, the...
21708
zoran
astrozor
Aug 9, 2012 4:55 am
Hello to everybody, Anyone has information where to buy spherometer in Ontario??? Thanks, Zoran...
21709
Ken Strauss
kstrauss7
Aug 9, 2012 1:05 pm
Why not make your own? There is sufficient info in Ingalls ATM 2-77. Dial indicators of varying quality are widely available - Princess Auto, BusyBee, KBC...
21710
Jan van Gastel
janvangastel
Aug 9, 2012 2:45 pm
I have built two. They are very accurate and very easy to make. See http://members.ziggo.nl/jhm.vangastel/Astronomy/spherometer/spherometer.htm Jan ...
21711
art.bianconi
Aug 10, 2012 4:39 pm
You can build a high quality spherometer in a few hours. Go to the PHOTOS section and look in the album titled SPHEROMETERS. Art...
21712
paul valleli
paul.valleli
Aug 11, 2012 1:45 am
Zoran, I am only aware of a few US manufacturers of Spherometers for professional use and they cost $thousands. There are several optical companies in your...
21713
Guy Brandenburg
gfbrandenburg
Aug 11, 2012 3:24 am
A continuation of my report on using the gorilla glue to attach ceramic porcelain tools: When I last reported to you, on Tuesday, I had accidentally formed a...
21714
Benoit Schillings
benoit_schil...
Aug 11, 2012 5:31 am
jb weld has been the most reliable glue I have used for years. maybe worth trying ? -- benoit...
21715
Tim Ulmer
tsulmer1
Aug 11, 2012 7:39 am
Somehow I missed the start of this thread. As a general contractor, cabinet maker / wood worker, and RC Model hobbiest, I have dozens of different adhesives...
21716
brock.family
debrock2
Aug 11, 2012 7:47 am
I use West System epoxy. Never even looked like coming off. Dave...
21717
Greg Furtman
gregfurtman
Aug 11, 2012 10:25 am
I've always used a marine epoxy like WEST or System 3. I've never had a tile come off. I would imagine that something like JB Weld epoxy would work fine too....
21718
Prasad
ad_prasad
Aug 12, 2012 9:58 pm
Group I want advice. Today I completed the mechanical assembly of truss for my 8 inch dob and it looked good. Then I attached the altitude bearing half moons...
21719
Mel Bartels
Mel_Bartels
Aug 12, 2012 10:10 pm
You can move the altitude bearings up the tube assembly a couple of inches. You can add a spring counterweight to pull down the mirror end when the scope is...
21720
jacques
savardjacque...
Aug 13, 2012 12:12 am
remove the tefflon put some ordinary plastic layer it append to me also I try to do tooo much best and it rool tooo easy jack 47'n 71'W Group I want...
21721
Robert Bond
rgbncube
Aug 13, 2012 1:00 am
You can increase the diameter of the altitude bearings. Bob...
21722
paul valleli
paul.valleli
Aug 13, 2012 3:14 am
First of all, Prasad, The OTA must be perfectly balanced at the Altitude Axis. Just changing to a larger eyepiece can upset that balance. An adjustable...
21723
atmpob
Aug 13, 2012 3:49 am
You usually want the optical tube to balance at the altitude bearings because if the imbalance is large enough increasing friction will not solve the problem...
21724
Guy Brandenburg
gfbrandenburg
Aug 13, 2012 3:48 pm
You will either need to add weight at the bottom end or move the altitude bearings. I have a bunch of iron window sash weights you can try -free. About 10 lbs...
21725
careysub
Aug 14, 2012 9:25 pm
... Don't you need to continually pump to maintain vacuum pressure during the cure?...
21726
lottesjj
Aug 16, 2012 3:12 pm
Guy, 1st post here but I've been lurking for awhile. Gorilla glue will stick to just about anything, but it does expand as it cures. Woodworkers (like me)...
21727
Guy Brandenburg
gfbrandenburg
Aug 17, 2012 3:57 pm
It most definitely did NOT work, even though clamped and wetted. The adhesion was minimal. Epoxy it will be. Â Guy Brandenburg, Washington, DCÂ ...
21728
Tim Ulmer
tsulmer1
Aug 17, 2012 5:01 pm
No geri la glue won't work. Good adhesion with polyurethane requires porous materials. Tim Ulmer Cell: 403-829-0343 Sent from my iPhone On Aug 17, 2012, at...
21729
Richard F.L.R. Snashall
rflrs2000
Aug 17, 2012 6:49 pm
... Sounds like the wisdom of Yoda. Sorry, I couldn't resist. It just struck my funny bone at first reading......
21730
daviddench@...
daviddench
Aug 19, 2012 6:12 pm
Dear All, This may be a little off-topic, but I need some advice/recommendations. I have a bespoke polar disk mount made for me some 20 years ago that had a...
21731
Ron Jones
ron8f8
Aug 19, 2012 10:17 pm
I'd like play around with the Ross Null a bit, was wondering if there was any particular reason to choose a specific focal length for the lens. I was ...
21732
peter de baan
pdebaan
Aug 20, 2012 4:17 am
Hi Ron, I am using a 80mm x 457 fl (18") this covers most mirrors up to 24" diam and 200" roc Peter...
