· Get a Cloudy Nights T-Shirt · Submit a Review / Article    Click here if you are having trouble logging into the forums Cloudy Nights - Official Forums of the 2009 International Year of Astronomy 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] Forum Archives · 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) Ed Jones Pooh-Bah Reged: 04/06/04 Posts: 1413 Loc: Sin-sin-atti Re: Eq Platform for $29.5 [Re: arpruss]       #3419771 - 10/30/09 08:53 AM Edit   Reply   Quote Quick Reply   Arpruss, Synchronous motor speed is determined by the line frequency. I don't need variable speed because the tracking speed is correct. If I were doing photography then I would use the variable frequency inverter mentioned above but then you would need a second axis motor too. -------------------- Ed Jones Post Extras:       salies member Reged: 08/10/09 Posts: 31 Loc: catalogne france Re: Eq Platform for $29.5 [Re: Ed Jones]       #3419814 - 10/30/09 09:38 AM Edit   Reply   Quote Quick Reply   hola ed! you work is very good for me! j am envoy see your build congratulations!!!! -------------------- sempre andavant ,mai morirem ! Post Extras:       arpruss scholastic sledgehammer Reged: 05/23/08 Posts: 838 Loc: Waco, TX Re: Eq Platform for $29.5 [Re: salies]       #3425266 - 11/02/09 10:37 AM Edit   Reply   Quote Quick Reply   Ed: How thick is the maple ply that you used? I am still in the planning stages. What I really like about this design is that it doesn't use a single-point south bearing like most of the other designs on the net. For my scope with a 25.5" high COG and about latitude 30, a single-point south bearing would require a ridiculously long platform--about 58" long. -------------------- Coulter Odyssey 13.1" split-tube Coulter Odyssey 8" Home-made 7.8" F/4 dobsonian travel scope Home-made 68mm F/5.3 achro (typically used as finder on 13.1") Skymaster 15x70 BPTs4 8x30 32mm Plossl, 30mm Rini, 27mm Kellner, 13mm Hyperion, 6mm TMB/BO Planetary, Owl 2X Barlow Palm TX with AstroInfo and RescoViewer Post Extras:       Ed Jones Pooh-Bah Reged: 04/06/04 Posts: 1413 Loc: Sin-sin-atti Re: Eq Platform for $29.5 [Re: arpruss]       #3426279 - 11/02/09 09:23 PM Edit   Reply   Quote Quick Reply   I use some old maple wooden flooring 3/8 thick and doubled it to 3/4. -------------------- Ed Jones Post Extras:       arpruss scholastic sledgehammer Reged: 05/23/08 Posts: 838 Loc: Waco, TX Re: Eq Platform for $29.5 [Re: Ed Jones]       #3446945 - 11/13/09 10:18 PM Edit   Reply   Quote Quick Reply   Does anyone have any spreadsheet for the measurements? I made one (I'll post a link once I know it works) but I'd like to double check its calculations against someone else's before I start to cut. -------------------- Coulter Odyssey 13.1" split-tube Coulter Odyssey 8" Home-made 7.8" F/4 dobsonian travel scope Home-made 68mm F/5.3 achro (typically used as finder on 13.1") Skymaster 15x70 BPTs4 8x30 32mm Plossl, 30mm Rini, 27mm Kellner, 13mm Hyperion, 6mm TMB/BO Planetary, Owl 2X Barlow Palm TX with AstroInfo and RescoViewer Post Extras:       Pages: 1 | 2 | 3 | 4 | (show all) Previous   Index   Next   Threaded   Extra information 10 registered and 7 anonymous users are browsing this forum. Moderator:  Don W, Mike I. 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