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gmac17
journeyman
Reged: 09/30/09
Posts: 9
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I have a 2002 NexStar 8 and I recently replaced the altitude nut cover because of a broken hand controller mounting tab. When I removed the small cover that fits over the altitude nut, I noticed the worm gear for the altitude drive had no grease on it at all (and looked as if it never had). Is there supposed to be a lubricant there?
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Tel
Post Laureate
Reged: 03/31/06
Posts: 3982
Loc: Wallingford England
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Hi gmac17,
Welcome to CN and this Nexstar forum.
I'd suggest you use, (sparingly), a light to medium general purpose automotive Lithium based grease or a Molybdenum disulphide(d) silcone grease both of which have good viscosity and lubrication properties at low temperatures. Don't however use a pure silicone grease as their metal to metal lubrication capability does not rank among the best.
Merely smear the the small drive gear, sparingly, with the grease of your choice and then "work" the axis under power, up and down, to distribute it to the teeth of the large driven spur gear.
Hoping this helps,
Best regards,
Tel
--------------------
Truth is the cubed root of Verbosity.
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Bob Griffiths
Postmaster
Reged: 10/10/05
Posts: 6583
Loc: Frederick Maryland
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Not really....none should be visible when looking at the nut and shaft ... using grease on or near a clutch is not approved..it would slip.
Bob G.
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CPC1100
Nexstar 8i + GPS & Rays Brackets
Denk S1 power switch
Orion 100 mm Refractor
Meade LXD 55 ...AR-5 127 mm Refractor
Exploradome Observatory S.I.E. (Smiling Irish Eyes)
Gerbring Heated Motorcycle clothing in the winter
39*21'03" N
77*28'12" W
The sky over my head....
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Tel
Post Laureate
Reged: 03/31/06
Posts: 3982
Loc: Wallingford England
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Agreed that there should be no grease on the shaft or nut, but where grease is necessary the operative words are " use sparingly".
According to the "Bible" aka The Nexstar User's Guide" on the subject of the N8i's altitude axis reassembly:
Quote:
"Lubricate the bearings with a small but evenly applied Lithium or synthetic grease. Also apply grease in the recesses for the nylon disks in the large gears. A thin coating of grease is also needed in the tracks that the disks ride in. Finally, apply a small amount of grease to the teeth of the large gears".
Unquote:
As this axis has however not been disassembled, the easiest way to apply grease to the large gear is to apply it sparingly to the small intermeshing drive gear and then allow it to be carried onto the teeth of the driven.
Obviously this doesn't cover all that a full disassembly of the altitude axis would, but at least both the drive and driven gears are lubricated as required.
Best regards,
Tel
--------------------
Truth is the cubed root of Verbosity.
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Midnight Dan
Carpal Tunnel
Reged: 01/23/08
Posts: 2761
Loc: Brockport, NY
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The lube that seems to be recommended pretty universally for mounts is SuperLube: http://www.amazon.com/gp/product/B000XBH9HI
Wide temperature range, long lasting, seems to be the one to get. I purchased some for use on my old NexStar 8 (before I had the 8SE) and relubing everything with it seemed to make it generally work better and quieter.
-Dan
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Scopes: Celestron NexStar 8SE, Orion EON 72mm ED/APO, Orion ShortTube 80
Mounts: NexStar Alt/Az GoTo, Orion Astroview (EQ3) w/single axis drive
Eyepieces: Baader Hyperion 36mm (Aspheric), 21mm 13mm, 8mm, 5mm;
Other: 2x & 3x Barlow, 0.63x Focal Reducer, Dew-not strips, DewBuster controller, SQM Meter
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gmac17
journeyman
Reged: 09/30/09
Posts: 9
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Thanks to everyone for your comments and advice.
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n1toga
super member
Reged: 05/15/08
Posts: 197
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I just blasted it with WD 40 seems to work fine :O....
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