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Found 4 results

  1. Just spent 4 hours resurrecting my AVX mount, it had become so stuff in RA it just wouldn't track at all. Googled as much as I could find and used the http://rocketsparrow.blogspot.com/2017/01/how-i-made-better-celestron-avx.html?m=1 as a guide. Decided to use a bearing as discussed in thread. I chose the https://simplybearings.co.uk/shop/p503131/32007-Premier-Budget-Metric-Single-Row-Taper-Roller-Bearing-35x62x18mm/product_info.html?backstep=1 as the dimensions were perfect ( almost perfect, bearing is 2mm too thick but works fine) Cleaned all the gungy grease off and used thin layers of superlube. It's so much smoother now and I can actually balance the mount. Only problems I had were the 2 bolts that hold the RA and Dec assembly together stripped the mount ! Soft cast ally by the looks of it but there are 4 holes for 2 bolts (almost like Skywatcher knew ) and refitting the motor worm assembly is tedious to get backlash adjusted . Can't wait to try it out. Ps the new bearing wouldn't quite fit til I put the mount in the oven @ 80 degrees and the bearing in the freezer for 5 minutes.
  2. Hi all I'm currently in process of maintaining my eq6 mount and noticed that my ra axis worm gear carrier roller bearing(s) have a bind to them when turning the motor gear. There is a definite stop when turning the gear slowly. It seems that both of the roller bearings at the end of the worm carrier rod would need replacing (see pic below, of the bearings that I mean). Have others noticed same thing? Does anyone know the item/skf number for these bearings so I could search for replacements from local shops? Btw the worm gear in both dec and ra axis were covered with huge amount of very sticky black grease and it has been a pain to clean this off. It sticks and stains everything, there are black stains all over the place ? Thanks for the help!
  3. Hi SGL, It's been a while since I've posted here. A friend and I are modifying my 16" lightbridge to an ultra compact design. Our plan is to go observing to the Indian Astronomical Observatory in the Himalayas next month, for a week. To make the scope portable, we're redesigning the primary cage and the rocker box. For the altitude bearing, we're unable to find any alternatives for Ebony Star (50) laminate. From what I've heard, it's currently out of production. Here in India, it's close to impossible to get laminates in small quantities. They only sell huge sheets of it, which we won't need. Do you know of any alternates for Ebony Star? Are there any retailers who sell small quantities for ATM? I have a friend who'll be travelling back from the US at the end of this month, so if I can order something there, he'd be able to get it back to India. We're quite short on time, so we don't have the luxury of experimenting with locally available laminates to achieve ideal stiction with teflon. Any help would be greatly appreciated! Thanks, Adarsha.
  4. This is the first mod to my newly acquired 250px. The teflon pad bearings on the mount are quite simply atrocious for a scope that costs over £400.00 new. Simple solutions are on hand though. Enter the B-Tech BT540 Television Turntable. These were available on Astroboot for a while and Amazon UK but they are currently out of stock. I am sure other brands of a very similar nature are available. This is a 16" bearing with a 75KG load bearing capacity. 1. Remove the dob mount pivot bolt and remove the teflon pads. 2. Remove the sticker centre from the turntable and push out the 2 part fixing so it comes apart. On checking the innards it is quite well made with steel bearings running in 3 channels. The centre hole is the same diameter as the pivot bolt so no machining is necessary. Put the unit back together, you can apply a little contact adhesive to the outer edge, this will aid assembly later. 3. Cut in half the dob mount centre bush. For ease of assembly I glued each half back into the woodwork with some contact adhesive. 4. Obtain a replacement centre pivot bolt that is 30mm longer than the original. Should anyone need one to try this mod let me have your address and I will pop one in the post to you. I only have 3 so it is on a first come basis. 5. Line everything up and reassemble with the new pivot bolt. Total build time about 20 minutes including waiting for the glue to dry and a 10 minute trip to my local nut and bolt shop. Mount is totally transformed, smooth and stable. No machining required whatsoever ..... simples
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