dawson Posted May 17, 2013 Share Posted May 17, 2013 Has anyone seen a modification to allow electric focus on a Crayford-style dual speed SCT focuser? The ones on sale are several hundred pounds, and just wonder if there is a cheaper option. Thanks James P.S. I have this http://www.harrisontelescopes.co.uk/acatalog/copy_of_SkyWatcher_Dual_Speed_Focuser_For_SCT_Telescopes1.html Link to comment Share on other sites More sharing options...
Astrocookie Posted May 17, 2013 Share Posted May 17, 2013 I'm in the process of designing one at the moment. I'll bring what I have so far to show you if you are interested. Cost so far is around £ 12.00 Paul Link to comment Share on other sites More sharing options...
dawson Posted May 18, 2013 Author Share Posted May 18, 2013 Paul, yes, i'd be interested to see. I'll bring my focuser and a second hand newt focuser i got for £10 once, and show you my idea! You might be able to help. see you later. James Link to comment Share on other sites More sharing options...
Astrocookie Posted May 18, 2013 Share Posted May 18, 2013 Blimey your up early. Hoping to get prime car parking space :-) Link to comment Share on other sites More sharing options...
Teslar Posted May 18, 2013 Share Posted May 18, 2013 Here's what I've rigged up with a few bits a aluminium bar and a pully wheel and belt Around £20 for parts plus the cost of the skywatcher auto focusser Link to comment Share on other sites More sharing options...
Antares_Paul Posted May 18, 2013 Share Posted May 18, 2013 I have a Sky Watcher auto focuser fitted on the same Crayford. Just modify the motor bracket (in my case butcher) and fit with longer screws. Regards. Link to comment Share on other sites More sharing options...
dawson Posted May 18, 2013 Author Share Posted May 18, 2013 Teslar, how does the aluminium plate attache to the focuser? James Link to comment Share on other sites More sharing options...
dawson Posted May 18, 2013 Author Share Posted May 18, 2013 Right, I dug out an electric focuser I'd forgotten about that I got with the tatty old reflector. Astroccokie showed me the screws and which I could undo underneath. I've had a play around, and I now think with minimal help I can get this working! The focuser is quite slow, but maybe the batteries are flat, but I'm not sure it needs to be quick anyway, but it was only £10 when I got it. James Link to comment Share on other sites More sharing options...
Teslar Posted May 18, 2013 Share Posted May 18, 2013 On the Baader there are two grub screws which just fill holes. So I used longer bolts to screw through the aluminium block :simples: Link to comment Share on other sites More sharing options...
Astrocookie Posted May 20, 2013 Share Posted May 20, 2013 That all looks very professional. Here's my parts so far, just working on the bracket!!! Controller with speed control (0 to 90% of duty cycle) 6V power supply input and motor output, up/down thumb switch. Servo motor modified for continuous rotation with 2.5mm socket for connection to controller. Link to comment Share on other sites More sharing options...
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