Click here if you are having trouble logging into the forums
Privacy Policy |
Please read our Terms
of Service | Signup and
Troubleshooting FAQ | Problems? PM a Red or a Green Gu.... uh, User
Suresh
super member
Reged: 08/05/05
Posts: 141
Loc: South India
|
|
I got this mount a bout a month ago. I noticed that while slewing from either extreme west and when it has to do a meridian flip, on occasions the motor runs but the mount does not slew(it actually stops). secondly when using a 10 inch OTA(lx 200) i can see the star dancing while moving from east to west; thirdly at slew speed 2 when i press east or west the star moves half the distance of my 12 mm reticle eye piece, stops a fraction of a second and moves.
Are these symptoms of the gear binding or gear slack?
Can i adjust the set screws without having to loosen the four 5mm screws( why must i loosen the 5mm screws to adjust the set screw i dont understand this)
Thanks
Dr.Suresh
India
|
RandallK
Pooh-Bah
Reged: 11/10/06
Posts: 1079
Loc: Nanaimo, B. C. Canada
|
|
I beleive the single set screw is a "push-pull" screw, the other 4 are to "even out" the pressure on each side of the gear. I would think that those four screws would be "balanced" if they've never been adusted. If this were the case, then it may be that you only have to adjust the 1 setscrew to either tighten or loosen the mesh. This is what I did on my old EQ3-2 mount. I'm sure someone will clarify this better.
--------------------
Scopes: Meade SC-8AT w UHTC
Orion ST-80 Refractor (Autoguiding)
SkyWatcher 5" F/5 Reflector
SkyWatcher 127mm MAK
Mount: HEQ5 Pro
Cameras: Orion Starshoot DS Colour Imager V.1
Imaging Source Webcam DMK21AU04.AS
Canon XSi 450D Unmodded
Palm TX PDA w Astromist and Bluetooth wireles control.
Oh yeah..and the ACME Cloud Destroyer!!
Edited by RandallK (01/26/08 05:37 PM)
|
ccs_hello
Post Laureate
Reged: 07/03/04
Posts: 3484
|
|
Can you clarify if you are using a GOTO mount, GOTO capable (EQ-G) mount, or the original classic EQ6 (simple stepper motor) mount?
Clear Skies!
ccs_hello
|
Nebhunter
Pooh-Bah
Reged: 10/04/03
Posts: 1323
Loc: Frostbite Falls
|
|
It sounds like you need to set your backlash settings on the hand contoller. They are normally set way too high a number, and cause these types of motions. My settings are at about 00:00:20 on RA and Dec. When slewing with speed 1, the mount moves as soon as I press the arrow button, and it stops immediately when released. Higher speeds may cause a bit of over shoot when watching thru an illuminated reticule, or high powered eyepiece. A high number setting may actually cause the mount to stop and drift back, or keep going after the button is released. You need to play with this under the stars.
Your gear mesh may also be a bit loose. You can test this inside with the scope off the mount. Put the dovetail in the saddle, and tighten it, and both clutches. Grab the ends of the dovetail and without applying much force, try to wiggle it side to side for the Dec. test. If you feel more that a very slight wiggle, and I mean VERY SLIGHT, then you should be OK. The gear mesh should be good. For the RA test, extend the counter weight bar, lock it, and grab it at the end. Now try to wiggle it back and forth, and feel for any play. That bar is long, so you can exert a fair amount of force, so go easy on it. Tiny bit of play is OK. If you need to adjust the gear mesh, go to this website, and follow the instructions to adjust the gear mesh. DO NOT over tighten them. Gears must have a tiny bit of play in them, or you will cause premature wear or damage to them. You will hear the buzz with your ear against the mount when you press the slew button to test. You will also feel the buzz vibration with your hands. Adjust, and test one gear set at a time. Go by feel. Then turn on the mount and test by sound and vibration.
http://timsastroblog.blogspot.com/2007/04/little-tune-up-for-eq6.html
--------------------
StarGeezer
Elemental nature must be approached with a reverential lens ~ Ansel Adams
http://www.nightfly.zoomshare.com/ www.pbase.com/pentax67
TEC 140 (Katyusha) & F/F - Equinox 80 - Losmandy G11/Gemini - ST-4 guider. PENTAX 67ii - 400(EDif) & siblings. I shoot FILM.
|
Suresh
super member
Reged: 08/05/05
Posts: 141
Loc: South India
|
|
Hi and thanks for all the responses, i love to fiddle with things and i stripped my set screw! and had another drilled(5mm)in the RA There is a slight side to side movement in Ra but none in DEC.I was wondering if this slight movement in RA after locking was wrong .I have Tim s blogspot in my favourites and yes it is the best ,as the other good site by Robertcook isnt working
Surehs
|
Suresh
super member
Reged: 08/05/05
Posts: 141
Loc: South India
|
|
Hi and thanks for all the responses, i love to fiddle with things and i stripped my set screw! and had another drilled(5mm)in the RA There is a slight side to side movement in Ra but none in DEC.I was wondering if this slight movement in RA after locking was wrong .I have Tim s blogspot in my favourites and yes it is the best ,as the other good site by Robertcook isnt working
Suresh
|
|
12 registered and 9 anonymous users are browsing this forum.
Moderator: Charlie Hein, lineman_16735
Print Thread
|
Forum Permissions
You cannot start new topics
You cannot reply to topics
HTML is disabled
UBBCode is enabled
|
Thread views: 243
|
|
|
|
|
|
|
Previous
Index
Next
Threaded
Edit
Reply
Quote
[Re: 