... It may seem like overkill to use large heavy bearings as your are suggesting, but I agree that this is the best way to get stability and smoothness. I...
rpasken wrote: -The problem with using a lasy susan for the elevation bearings is that they need to be radial bearings, whereas the lasy susan is an axial...
in my case is not restart it realy start for first time I plan to do so a kind of equatorial mount whit a eavy duty bearing from my old lumina car front weel...
Newbie here, Link at end. I thought this mount was worth thinking about. You can scale it up to a 200 inch mirror (smile) if you want. Link from ebay. I have...
Look at folder brombo in photos. Pictures of both elevation and azimuth bearings. Note that the azimuth bearing moved so easily (the first time I took the ...
G'day I like to reduce the secondary of my 12" f5 Newt. how abaut using a good quality 2" barlow between the secondary and the primary (with a bafled...
Hi, I´m trying to make a worksheet to estimate the center of gravity position of a truss dob OTA. This dob will work also on an EQ fork mount, so the position...
You need to use the center of gravity and weight of each telescope subassembly to calculate the torque due to each subassembly and arrange your weigths so...
Hello everyone: I have some sad news to share. Our good friend and coworker, Dean Carlton died suddenly of a heart attack Monday night. Dean worked with us in...
Hi Allan, Thanks for your help, but that´s precisely what I´m doing. I used the function "Goal seek" on Tools Excel menu to find the CG position (x) where...
Use the trusses center of gravity as a subassembly. If you have n masses denoted m(i) 1 <= i <= n and vectors to center of gravity of each mass denoted r(i),...
Richard, You're making this too complicated. There are more factors to consider than finding the exact CG of the tube. First does the lower end of the truss...
I am not familiar with the "goal seek" function, but the discrepancy seems to be due to it. The entries in the rightmost column in each table are the...
... You don't have to be a matematician to find the c.o.g.: Assemble the whole tube with everything you plan to use on it, then while it is lying horizontal...
I am having great success using my Bath interferometer and OpenFringe to analyze the figuring on my 16 x 1 Plate glass mirror. The mirror is almost completely...
Greetings, New guy here. Working on a 10" F8 mirror. Was doing the final figuring and chipped the edge. The chip on a circle guage is 23/32 inch and...
... TRASH?????? ... Mark, Is the chip on the front, back or side? It makes a big difference. If this is a full thickness blank and the chip is on the front,...
That is about 3/4 of an inch about 3% of the surface and will not make much of a difference. Just paint it black after the mirror is coated. Dale Eason...
... Unfortunate, but Dale is right. It won't make any noticeable difference if you paint it flat black and a little over where it will likely have some errors...
I thought you may like to see a mount made from truck parts so have posted a picture un the photo section in 'Sitting Hen obsevatory' The mount is made from a...
Wait, what was I thinking. That mirror is trash. Send it to me and I will throw it away for you. I'll even pay the shipping out of the goodness of my heart. ...
You're right Dale the mirror is trash. I have a really great trash can at my house. It's about 80" long and 12" in diameter. I'll just put it at the bottom of...
... Tony Excellent job, I sure would like to see more photos and details on this fork mount. I have access to those parts once in a while at work that we...
See Files section Dale Eason for Session17.jpg I tried to lower the edge at 3 and 9 O'Clock and a little work on the center. Did that however adjacent edges...
I have a new kodack c653 and playing whit the new gadjet i place it in macro mode in the back of my 25X100 and also on ny 7X35 binocular and surprise it work...
As some of you know I have been figureing my 16 x 1 for awhile now and am getting close to done. I just learned a lesson. Don't go do metal work just before a...
... Dale can you post a link to this picture, as I can not find it, I looked in the interferometer group and here and did not see a scratch.jpg thanks...
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