Terry Terry McInturff President, Terry C. McInturff Guitars, Inc. SkySpy 10 prototype...10" f6 dual strut dob, premium glass Various ES, TV,UO,Ultrascopic, etc eyepieces 4.250" f4 RFT Newt doubles as SkySpy "finder"
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1961 8" F8 Criterion Dynascope Deluxe (dob mount) C6, Celestron GT102 ,PST Vixen Ascot 10x50,12x50 Pentax PCF WP II Denk big easy pairs of TV 32mm,11mm plossls, celestron 25mm plossl, 17mm sterling, 9mm X-cel LX, 20mm superviews AT 17mm 70 AF, 8mm AT Paradigm, AT 12mm plossl ES 82* 6.7mm,11mm,14mm,ES 68* 24mm 2.25x Ultima Barlow VT 25mm Ortho, BCO 10mm,18mm, TV Plossl 15mm,26mm, GSO 40mm plossl, 20mm sterling 1 dog, 3 cats, 2 sons and a beautiful wife
Quote:do tell about your tweaking
Celestron 8SE Dobstuff 13.1": Swayze refigured Coulter mirror, 6 pt mirror cell (2 pt edge support) and CF focuser board made by me StarBlast 4.5 ST80/PortaMount II Zhumell 20x80/Oberwerk 15x70 on a Seronik-style tripod boom mount Hubble Optics 18 inch F/4 mirror.
Quote:To my eyes the spider support is almost entirely invisible in the posted images, and what can be seen is indistinct. Can you post another?
6" F4.6(w/Paracorr) Reflector , 8" F11 Dall Relay Scope ,
6" F5 RFT Refractor w/Istar Obj , G11 Mount Gemini1 Level 4
Quote:Get another flexible ruler bend it to the same shape as the first and then epoxy (laminate) it to the first one so you have a 2-ply spider. Attempting to keep the spider too thin becomes an obsession with some folks. Better to make it too stiff than not. You may need a 3rd thickness. On my curved spider, it must be forced into place by the screws (ie: it is like a compressed spring when installed). I haven't decided exactly how important it is to do this.
You can see my spider in the link below for the 6" F4 reflector.
My opinion anyway.
Quote:Here is a link to a page with a picture of the only curved spider I've found stable:
It's the second picture on the right side of the page down from the top.
It seems to resist sag quite well.
Quote:Terry, I can't help you with your curved spider woes (but seems several others can) ... however, I would like to compliment you on the exceptional craftsmanship that is evident in your instrument ... it is really a work of art, beautiful to look at. Well done, and thanks for sharing. Dave O
Home-built Dob 10 F6/Zambuto/Osypowski Platform Starmaster 7 Oak Classic- Zambuto Discmount DM-4 w encoders Stellarvue 80ED Stellarvue 70ED Stellarvue 60 Finder Tasco 50 refractor (1966 birthday gift) Orion 80ST Lunt 60 Double Stack Bogen with Dwarfstar mount AT Voyager mount Celestron SLT mount Astro Physics 15x70 Binos Orion Parallelogram mount