· Get a Cloudy Nights T-Shirt · Submit a Review / Article Click here if you are having trouble logging into the forums Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu… uh, User You are not logged in. [Login] Entrance · Main Index · Search · New user · Who's Online FAQ · Calendar Equipment Discussions >> ATM, Optics and DIY Forum Previous   Index   Next   Threaded   Pages: 1 | 2 | 3 | 4 | (show all) tim53 Postmaster Reged: 12/17/04 Loc: Highland Park, CA Re: Building a wood Tube [Re: Pinbout]       #5276365 - 06/17/12 11:43 PM Edit   Reply   Quote Quick Reply   The scrap stuff I tested in the 5" cardboard tube handled it okay, though it's relaxed to more like 12" diameter now that it's dry. It must be glued with waterproof glue, because I got no delamination at all. I have no clue about the 4x8 sheet though. -Tim. Post Extras:       astrobeast1 super member Reged: 09/28/10 Loc: leicester england Re: Building a wood Tube [Re: tim53]       #5276608 - 06/18/12 05:26 AM Attachment (20 downloads) Edit   Reply   Quote Quick Reply   Hi all, I found this thread fascinating with all the different methods used, thanks everyone. Some of you may have seen my attempt at making a 635mm hexadecagon (16 sided ) plywood binoscope.My album will show more pics of the build, a lot of the ideas were gleaned from this forum, so many thanks for them.I,m at the mirror making stage at mo. regards Dan Edited by astrobeast1 (06/18/12 05:32 AM) Post Extras:       tim53 Postmaster Reged: 12/17/04 Loc: Highland Park, CA Re: Building a wood Tube [Re: astrobeast1]       #5276906 - 06/18/12 10:52 AM Edit   Reply   Quote Quick Reply   Looks impressive, Dan! One of the reasons I'm considering a round tube this time is that I mount my scopes (so far) on GEMs, and so I need them to rotate. My 10" tube rotates okay, but getting the rings mounted to the 9-sided tube tightly has been frustrating, since the tube isn't a perfect nonagon and varies in trueness. So, I was thinking it would be easier to make a round tube by making a form that doubles as bulkheads/baffles after the tube is finished, and building the tube around that (or inside inner rotating rings and end rings, perhaps). I suppose the same strategy could be used in making a polygonal tube as well, like plyscope does or I did for my 6" f/15 Jaegers: or the 8" Springfield I built 30 years ago: Neither of those tubes need to rotate, though. And when I was finishing them, I trimmed the last couple of sides to take up some propagating errors that came along as the layup progressed. For a rotating polygonal tube, then, I could make the inner rotating ring halves double as forms for fitting the plywood sides inside them, and make adjustments in the side widths as I go. I suppose either tube type will give the same problems with that last seam (with the polygon) or the butt joint (for the rolled tube). But at least, from the get-go I'd have the basis for a rotating tube built into the tube. (I'd have to approximate the final balance point, and/or provide for a tube weight system - which is desirable in a rotating tube anyway). I left out coopering inside the rotating rings and end rings. That might be even easier to do than rolling plywood or polygonal tubes. A year or so ago, I'd bought this absolutely beautiful 2x7" by 66" Cherry plank, with stunning figure. But it's not long enough for the 8" f/9! So if I do a coopered tube, I'll need to find another stick! Probably about 7 feet long... ...or make the tube in sections, like Royce describes. -Tim. Post Extras:       hickeydp professor emeritus Reged: 06/14/09 Loc: Ireland Re: Building a wood Tube [Re: tim53]       #5276953 - 06/18/12 11:18 AM Edit   Reply   Quote Quick Reply   Hi Tim, I'm planning something very similar to what you've suggested above. I have a carpenter friend that I have been talking to about this and he has suggested cutting out circular baffles from marine ply, bracing them and then wrapping it in a 3mm flex-ply. I'm looking to house a 16" f5 newt in this and he's confident that the tube will be stable enough. Hoping to start the initial work this week. Post Extras:       rboe Reged: 03/16/02 Loc: Phx, AZ Re: Building a wood Tube [Re: Pinbout]       #5276963 - 06/18/12 11:26 AM Edit   Reply   Quote Quick Reply   Velcro strapps make good strapping clamps (as well as surgical hose) as long as glue is not involved. 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