Guest Fluke Posted August 20, 2012 Share Posted August 20, 2012 I've just skipped through the epic 'Degree Circles' thread on CloudyNights.com. Has any of our group had a go? I know Daz is keen to mod his, and Martyn has mentioned it before too... Anyone know of any UK suppliers of the laminated circles? I've done a few Google searches to no avail Cheers, Dan Link to comment Share on other sites More sharing options...
catman161 Posted August 20, 2012 Share Posted August 20, 2012 Mick (doc) definitely did his when he had his big Dob Dan. He's the man to speak to Re: Dob mods Link to comment Share on other sites More sharing options...
Brantuk Posted August 20, 2012 Share Posted August 20, 2012 This is the place to get them : http://settingcircle...d=linear_screen Take it on a disk to your local Staples shop (office stuff) and they'll scale it up and laminate it for you - only circa £15 last time I looked Link to comment Share on other sites More sharing options...
Guest Fluke Posted August 21, 2012 Share Posted August 21, 2012 Brilliant Kim, thank you Link to comment Share on other sites More sharing options...
BAZ Posted August 21, 2012 Share Posted August 21, 2012 You can go hi tech if you want with one of these. http://www.axminster.co.uk/gemred-rotary-angle-encoder-with-remote-sensor-prod806698/ Link to comment Share on other sites More sharing options...
Guest Fluke Posted August 21, 2012 Share Posted August 21, 2012 You can go hi tech if you want with one of these. http://www.axminster.co.uk/gemred-rotary-angle-encoder-with-remote-sensor-prod806698/ I've got a Wixey from my old job where we used to make amongst other things angled wardrobe sliding doors - isn't the item in the link the same idea? Link to comment Share on other sites More sharing options...
+Doc Posted August 21, 2012 Share Posted August 21, 2012 Thats what I'm going to use next when I get round to designing a new dob, do away with the degree circle. As long as the shaft goes into the ground board and is secured it will work fine. Link to comment Share on other sites More sharing options...
BAZ Posted August 21, 2012 Share Posted August 21, 2012 Yes, similar, but uses an encoder to measure rotary motion. I have one which came with the scope, you just need a modified M10 bolt for it to fit in. This will mean modding the base a bit, but it's easy to do. Thanks to Damian letting me have a old lappy of his, I can now use it, getting the co-ordinates off Stellarium. Link to comment Share on other sites More sharing options...
Guest Fluke Posted August 21, 2012 Share Posted August 21, 2012 Yes, similar, but uses an encoder to measure rotary motion. I have one which came with the scope, you just need a modified M10 bolt for it to fit in. This will mean modding the base a bit, but it's easy to do.Thanks to Damian letting me have a old lappy of his, I can now use it, getting the co-ordinates off Stellarium. Sounds great! Any chance of some pics of your base as I cant really picture the mod? Link to comment Share on other sites More sharing options...
BAZ Posted August 21, 2012 Share Posted August 21, 2012 Iam having trouble loading the pic. Basically what you do is get a hole drilled down the top of the M10 bolt head, so that the shaft of the encoder fits into it. A hole is drilled and threaded from the side of the head, so a grub screw tightens onto the shaft and locks it in place. The bolt has the nut under the base board, and tightened so that it all moves just right. A plate is made to stop the nut rotating when the board moves, that way the movement is picked up by the encoder, as the bolt stays where it is. Clear as mud when I read it back, I'll see if I can take some small file size pics. It really isn't as difficult as it sounds. If I can get hold of some bolt's I'll drill them and mod them to suit, all I will need is the dimensions of the encoder shaft. If you are thinking about getting one, ask about the longer cable, so you can have it mounted up by the focuser. Link to comment Share on other sites More sharing options...
Guest Fluke Posted August 21, 2012 Share Posted August 21, 2012 Thanks Martyn, I think I've got it. Link to comment Share on other sites More sharing options...
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