· 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 | 2 | (show all) Eddgie Postmaster Reged: 02/01/06 Re: Hurst 1/2 RPM Motor Needed [Re: JohnH]       #2529941 - 07/20/08 12:00 PM Edit   Reply   Quote Quick Reply   Well, if impact jammed it up, my bet is that impact will un-jam it. I would try tapping it onto the head of a hammer from different orientations. I mean at this point, it sounds like you don't have anything to loose. These are very small gears and the torqe of the motor is greatly reduced trough them so by the time you get to the output, the torque is so reduced that even a tiny mis-alignment might bind them up. I wouldn't pound it, but I sure would try doing some "Taps" against an anvil in different orientations and try the motor after each run. I might also simly try getting something snug around the output gear and forcing it forward and back. Maybe protect the teeth between a couple of peices of wood and use a vice grip. Just torque it back and forth a bit to try to transfer the energy back through the gearbox to unbind it. In fact, I might try this first.... Good luck. Post Extras:       JohnH Carpal Tunnel Reged: 10/04/05 Loc: Squamish BC Moved!!!!! Re: Hurst 1/2 RPM Motor Needed [Re: Eddgie]       #2530094 - 07/20/08 01:22 PM Attachment (37 downloads) Edit   Reply   Quote Quick Reply   Your last message gave me the clue I needed (and the encouragement) and I used a spade bit (bad use of a not very accurate tool) and I pried up the three tabs that appeared to hold the top winding and the soft iron the other part is made of (it holds the magnetic fields needed for the motor to operate) and actually look directly. I reasoned that the motor was toast, and I had little to lose by playing around. There is indeed a rotating flywheel underneath, which spins very freely with little resistance. I held the motor up by just the gear, and tried spinning this with a fingertip to see if the torque gets transfered through the gearbox. The drive gear did turn, so the gears work and the trouble must lie with the part I removed. The upper coil was held by six 'petals', three above and three below, that are folded down to be press-fit inside the aluminum shell of the rest of the housing. Three of these are just short ones that have holes for the tabs that are folded in from the cap to cover the insides, and the other three extend down further. They all extend around the rotor and have a fairly close tolerance, around 1/32". This part had been compressed when the mount slid into the seat back of my van. I made sure these legs were straight and put the coil back. The disc still didn't rotate freely, so I checked to see if there was still clearance around it. There was, so I pried it up a bit and this time, the disc would spin freely. I pulled the winding again, and all the legs had no protruding bits. I looked at the part and noticed that the legs were squashed down slightly so I used the drill bit again to raise them, and I made the legs of it right angles. Now it would spin freely with the winding placed. The motor was binding on the top. I connected it to the circuits of the mount and it works properly now. I don't know if it tracks at the right speed, but I'll find out tonight. Thanks for all the help on this people. See you at Table Mountain. PS. Now if I can just fix the van as easily. Edited by JohnH (07/20/08 01:36 PM) Post Extras:       Skywatchr Carpal Tunnel Reged: 06/03/06 Loc: North-Central Pa. Re: Hurst 1/2 RPM Motor Needed [Re: JohnH]       #2532012 - 07/21/08 02:07 PM Edit   Reply   Quote Quick Reply   Ah, heck, a little duck tape and the van will be good as new! Post Extras:       JohnH Carpal Tunnel Reged: 10/04/05 Loc: Squamish BC Moved!!!!! Re: Hurst 1/2 RPM Motor Needed [Re: Skywatchr]       #2532094 - 07/21/08 02:52 PM Edit   Reply   Quote Quick Reply   Regretably, the van is a company vehicle and has to be presentable at all times. Summers are slower, so I have time to get it fixed up. My insurance rates are another matter however........ Post Extras:       JohnH Carpal Tunnel Reged: 10/04/05 Loc: Squamish BC Moved!!!!! Re: Hurst 1/2 RPM Motor Needed [Re: Tom and Beth]       #2536307 - 07/23/08 11:02 AM Edit   Reply   Quote Quick Reply   Followup: The Codemicro people finally got back to me awith a price for the motor in question and they do have one in stock for $170.93, about $23 cheaper than any other place I looked. I'm actually glad they took so long, as I time to tinker and ask questions here and I actually learned that this mount isn't actually a scary thing deep down, just simple, accurate and elegant. I might just buy one to have a replacement on hand for an emergency. I still have to test the mount the, but I haven't had a clear night since I passed on the evening when I fixed it. Post Extras:       JohnH Carpal Tunnel Reged: 10/04/05 Loc: Squamish BC Moved!!!!! Re: Hurst 1/2 RPM Motor Needed [Re: JohnH]       #3036800 - 04/10/09 07:14 PM Edit   Reply   Quote Quick Reply   Got a spare Hurst motor from the Black Forest Observatory sale by Van Slyke. The second one he sent is a non-reversable (one pair of wires) 4 RPM motor. Any tskers? PS How exactly does a syncronous motor function?? Edited by JohnH (04/10/09 07:16 PM) Post Extras:       Pages: 1 | 2 | (show all) Previous   Index   Next   Threaded   Extra information 27 registered and 26 anonymous users are browsing this forum. 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