· 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 >> Mounts Previous   Index   Next   Threaded   Pages: 1 whirlpoolm51 professor emeritus Reged: 01/05/12 Loc: pittsburgh,pa Motors for ultima,meade lx and cg5 mounts??       #5493652 - 10/28/12 08:22 PM Edit   Reply   Quote Quick Reply   Does anyone know exactly what type of motors are used in any of these mounts?? particularly the cg5-agt?? And also do they use 2 motors for tracking and one for slewing??? I would imagine using a lower rpm motor for tracking wouldnt be able to slew at a fast rate so do they have a seperate motor for slewing??? I would love some help on this please!!! hahahaha what i really need to know is the type of motor ( DC servos??) and what gear ratio and rpms they have thanks Post Extras:       orlyandico Carpal Tunnel Reged: 08/10/09 Loc: Singapore Re: Motors for ultima,meade lx and cg5 mounts?? [Re: whirlpoolm51]       #5493955 - 10/29/12 12:36 AM Edit   Reply   Quote Quick Reply   the CG-5 ASGT, CGEM, and CGEM-DX use Igarashi motors. They use an USDigital E4P encoder with 256ppr. The gearbox has a really strange ratio, 47.976... (non-integral ratio) This motor - http://www.mpja.com/12VDC-65-RPM-Gearhead-Motor/productin... has the exact same gear ratio as the CG-5/CGEM/CGEM-DX motors in fact some folks have transplanted the gearbox onto their CGEM motors (the actual motor above is much smaller than the CGEM motors). Post Extras:       ccs_hello Postmaster Reged: 07/03/04 Re: Motors for ultima,meade lx and cg5 mounts?? [Re: orlyandico]       #5494213 - 10/29/12 08:28 AM Edit   Reply   Quote Quick Reply   3 compound gears plus one on motor shaft and one on output shaft. 23/8 x 30/12 x 30/12 x 32/12 = 47.9166666667 When compare that figure with 47.9765625:1, it's 800:801 (strange, since 801 has a large prime "89" number in it). 89/32 x 23/4 x 3 = 47.9765625 Re: 2 different motors for different tracking or slewing speed (q from Whirlpoolm51) No one does that. DC perm-mag has a wide speed range thus can do that. For hybrid stepper, it's the low gear-down mechanical gear box plus microstepping (electronic gear shift) does the wide dynamic range magic. Clear Skies! ccs_hello Post Extras:       whirlpoolm51 professor emeritus Reged: 01/05/12 Loc: pittsburgh,pa Re: Motors for ultima,meade lx and cg5 mounts?? [Re: ccs_hello]       #5495033 - 10/29/12 05:29 PM Edit   Reply   Quote Quick Reply   I know celestron uses a pittman amtek 19.1 vdc motor with a gear ratio of 60 5:1 so i was thinking of getting that but for sre not form celestron hahaha they want 350 for that motor with encoder and i can get it on ebay for 14.00 bucks and i alreayd have encoders hahaha i have noticed they use very wierd ratios for thier eq mounts i dont get it!! Post Extras:       Pages: 1 Previous   Index   Next   Threaded   Extra information 18 registered and 38 anonymous users are browsing this forum. 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