Nytecam 51N 0.1W Meade 30cm LX200 astrograph+C8+Ha+CaK PSTs+spectrographs SX M9+Lodestar-C+M CCDs/Canon 1100D DSLR My Meade astrograph-colour deepsky My supernova discovery My dome build/spectroscopes/DSO images/Lodestar colour images & videos
7x35 and 10x50 sears tower binocs, 3" f/10 edmunds reflector, 2.4" f/11.7 manon refractor, 6" f/8 jaegers refractor, 10" f/11 R30 Istar refractor, 3" f/15.8 sans&streiffe refractor, 3.1" f/15 selsi refractor(towa 339), 2.4" f/15 sears refractor, selsi 30x30mm spyglass, criterion 5-draw 25x45x75x spyglass(1957), 4.25" f/14.8 tasco 20te.http://cleardarksky.com/c/OmahaNEkey.html
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Quote:Hammer drill holes into the existing footer and epoxy in rebar. Add your sonotube form and pour away.
12.5 " F5.6 Homemade Dob , mirror ground and figured by myself 10 " F4.0 LXD55 Meade 6" F8 Homemade Dob , mirror ground and figured by myself , Sears 60mm x 900mm Refractor
Quote:There was a link here a few weeks ago that discussed the analysis of pier deflection based on pier diameter and wall thickness. I read the link carefully because I'm also using 6" steel box tubing for my pier (about 41" high). I wish I could find the link, but the bottom line is that you won't have much deflection at 22". One thing that does help though is to add reinforcing members at the baseplate, which is the point of maximum stress.JimC
Quote:Prefect. Thanks Jim. I was wondering if those holes had a purpose I am going to pick up the 6" square tube today - just need some plates now.
I had a lawyer cousin that was disbarred. I also had a clergyman uncle that was defrocked. I am a retired electrician, now I am delighted. Good astronomy comes from experience, much of which comes from bad astronomy. ES 127 ED on Atlas in ROR observtory Images Plus for imaging, stacking and calibration PS4 for processing Skywatcher ST80 and PHD with SSAG Hutech modified Canon T1i EQASCOM and all its associated programs Meade 12" LX200 GS Meade ETX 125EC
Quote:Take the wooden pedestal as a template so they get the hole patterns right -- they're all that matters.