paul Posted April 25, 2021 Share Posted April 25, 2021 My Orion Optics 250mm is an ongoing refurb project. I was disappointed that guiding wasn't as tight on my new mount as I had hoped and too many images lost their star shapes. I noticed that the rolled aluminium rings seem very stiff but once you mount the scope in them with a guider on top of that gives enough moment to cause ring wobble on the vixen plate. I decided that was a good candidate for improvement ( the rolled OTA tube is very stiff). I looked in to replacement rings but the kitty isn't bottomless. So I decided a bit of bracing might do the trick.... I've bolted a 350x300x6mm plate to the vixen plate as a sold inflexible base. I'm using extruded 2020 aluminium to make a structure to rise up from the base and attach to the clamp assembly of the rings. That's the plan anyway. This will add about 3.5kg to the mount but I have the capacity. I plan to try out the guide scope fitted to the side off the extruded verticals. That should be very rigid too. At the moment support on one side looks to be sufficient but I am allowing for support on both sides of the rings. Its looking a bit rough and ready but it is going in the right direction. I am allowing for a lot of adjustments as my cutting is not very precise. The jigsaw cuts through the plate like butter but its tricky keeping a straight line 🙂 its a big project me! Once all the parts are cut to size and fettling complete I'll clean it up and give it a good coat of paint. Some shots of the ongoing project ... An early stage with the rings in place checking for clearances: more to follow soon. 1 Quote Link to comment Share on other sites More sharing options...
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