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cantharis

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Posts posted by cantharis


  1. I did this last year - following Astronomy Boy´s guidelines. All I can recommend is you do carefully take notes of what you dismantle and in what order. Get in some lithium based grease, and some diesel to clean the old glop out. I needed a 5mm 4mm 2.5mm and 1.5mm Allen key, and a 17mm box spanner. The result is a much smoother, easier to operate mount - well worth doing. Good luck.


  2. Again, the usual load of confusing and conflicting opinions. Firstly, the gears in your mount are very LIGHTLY loaded at all times, and when it is just tracking are experiencing close to a zero load - after all, we are just rotating a tube that is balanced and only masses a few kilos. So the manufacturers can make the bearing surfaces out of soft, easily machinable metals like brass and aluminium and even plastics.

    Our cars have wheel bearings which operate under the most gruelling conditions, high rotational speeds, continuously loads of hundreds of kilograms and shock loads of thousands of kilograms, all happening at high temperatures. For these harsh conditions a lithium based grease is invariably that of choice. I find that this high performance lithium grease is more than adequate for our lightly loaded mounts, and recommend its use. I would indeed recommend that anyone buying a mount made by Synta clear out the stiff glop that the makers put in - mostly to disguise the sometimes large clearances that can occur, and rebuild it carefully using a lithium grease. I have done this with all my mounts with total and lasting success, and an immediate improvement in how the mounts function.

    I have found that Synta´s stiff glop can make balancing the scope in the mount a most imprecise operation - basically preventing the mount from achieving an important design function.


  3. I live in Spain and use Teleskop Service whenever I can. Prices are competitive and carriage way cheaper than the ripoff merchants in the UK charge. And Maplins are one of the worst offenders in that respect - they wanted a whopping 18UKP to send a small relay weighing about an ounce!!

    Someone mentioned power tanks - I bought a car starter type tank identical to one that Maplins carry for €32 in my local Carrefour.

    • Like 1

  4. Pretty good load of conflicting ideas here.

    May I say - there are, certainly in engineering terms, NO high load bearing surfaces in any EQ or Alt-Az mount - there are LOW loads when the mount is slewing and EXTREMELY low loads when it is tracking. Which is why the manufacturers are very happy to use soft - and cheap and easily machineable materials - like brass and Al and even PLASTIC gears. Lubricants like Lithium greases are MORE than capable of managing such LOW loads.

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