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usnao95
super member
Reged: 01/03/08
Posts: 102
Loc: Port Richey, Fl
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i've got an LXD75 and every once in a while i hear a little "tick" noise coming from the mount, doesnt happen much, but would that sound be the "backlash" that i hear happens with mounts? 
Edited by usnao95 (08/18/08 08:52 AM)
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robjohn
member
Reged: 06/04/08
Posts: 89
Loc: West Hills, CA
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Backlash happens because the gears that move the telescope cannot mesh tightly (or else they would bind up). When the direction that the scope is being driven changes, there is a short delay while the gears take up the slack before the gears can drive the scope in the other direction.
I don't hear any "tick" noise when my scope finishes taking up the backlash, but I guess it is not impossible.
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Rob Johnson
Celestron 14" SCT | 8" SCT | 102mm f/5 | Ultima 8x56
ZenithStar 105mm f/7 | 80mm f/6
Vixen ARK 16x80
CGE | CG-5
Canon 50DH
Starfish autoguider
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GeorgeDuke
Pooh-Bah
Reged: 04/24/03
Posts: 1135
Loc: PARADISE! (So.Florida)
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Try adjusting the balance load on the mount to be slightly out of balance. There are some that have mastered the technique of putting the load out of balance one way when the OTA is on one side of the mount and the other way when the OTA is on the other side. Keeps the teeth in contact. If the load is wrong, as each tooth leaves mesh the load can cause the un driven gear to jump back to touch the driven gear causing the tick. I used to get it on my LX200 mount until I put balance weights on it.
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George
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LX200GPS 203mm f10
StellarVue SV102ED2 Feathertouch Ser#0018
Celestron 130mm f15.4 Mak
LXD75 GOTO with Orion 16" pier extension
Desert Sky DSV1 dual head ALT-AZ mount
Baader Hyperion 8mm ,13mm, 21mm and 8-24mm Zoom
2" GSO ED barlow, Orion 2" Prism Diag. 2" WO Dielectric
Chinese Scopes, Chinese Eyepieces, Chinese Wife, Love them all!
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mikey cee
Carpal Tunnel
Reged: 01/18/07
Posts: 2287
Loc: bellevue ne.
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That's the advantage I've enjoyed for 30 years. My drive uses a nylon worm that drives an aluminum toothed gear wheel. What a pure pleasure it has been to use.....no slop or backlash ever!   Mike
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Mike 10x50 sears tower binocs, 3" f/10 edmunds reflector, 2.4" f/11.7 manon refractor, 6" f/8 jaegers refractor, "The 8 Ball" 8" f/13.3 brandt refractor, 3" f/15.8 sans&streiffe refractor, 3.1" f/15 selsi refractor(towa 339), 2.4" f/15 sears refractor, selsi 30x30mm spyglass, criterion 5-draw 25x45x75x spyglass(1957).
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usnao95
super member
Reged: 01/03/08
Posts: 102
Loc: Port Richey, Fl
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Quote:
Try adjusting the balance load on the mount to be slightly out of balance. There are some that have mastered the technique of putting the load out of balance one way when the OTA is on one side of the mount and the other way when the OTA is on the other side. Keeps the teeth in contact. If the load is wrong, as each tooth leaves mesh the load can cause the un driven gear to jump back to touch the driven gear causing the tick. I used to get it on my LX200 mount until I put balance weights on it.
thanks George that seems to make good sense.
eric
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Eric
Florida
Meade 8" 2080
Orion ShortTube 80 400mm
LXD75 w/autostar goto
Meade DSI Pro
Logitech QuickCam Pro 9000
Meade f/ 6.3 focal reducer
JMI motor focus<---best investment so far
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