Re: DEC axis a bit stiff on G-11
I wonder why, seems you would want them there for the same reasons, to disengage the clutch and provide better feel.
Jeff
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Re: DEC axis a bit stiff on G-11
I looked but there is not one on my G-11. I asked Losmandy and they told me one does not go there.?
Greg
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Re: DEC axis a bit stiff on G-11
Maybe you were misunderstood - there is a wave washer on the Dec axis of my GM-8
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Tightened clutch = drag in RA axis of GM-8
I recently decided to tear down my GM8 for cleaning and re-lubing for the first time and, what I thought was a lubrication issue has turned into what could possibly be another case of shaft misalignment, although I have yet to completely wrap my head around what I am seeing...
On the RA axis, I am getting drag as the clutch is tightened and have found clear witness marks on the RA shaft that confirm what is happening. On the RA shaft, directly adjacent to the outer (lower) bearing race are the noted marks (I have loaded three photos in album labeled photon_trap) where the ID of the bearing or maybe the outer race is coming in contact with the shaft resulting in considerable drag.
I could remove a few thousandths of an inch from the shaft but not fully understanding why this is happening (other than a better design might have provided a shoulder for the bearing ID to ride on like at the other end) I am very hesitant to do that. I see no gap around any of the bearing block to center section interfaces (will not accept .0015 feeler gauge)
Also, I have been using the "improved" wave washer position between the knob and aluminum spacer and have removed the wave washer completely with the same result. It seems the rotation of the clutch knob is somehow forcing the bearing to one side until it contacts the shaft. I have also noticed minor witness marks on the shoulder on the worm end of the shaft from the bearing/race ID, no where as severe as those pictured - more like wear marks, probably normal.
In searching, I have found others to have similar symptoms but I am not sure my situation is the same -- Any insight is appreciated
Jeff
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Re: DEC axis a bit stiff on G-11
I took off the scopes and loosened the clutch knob. still a little stiff. I pulled the shaft out and saw NO marks of any kind on the shaft that would indicate rubbing somewhere. When I pulled the shaft away from the clutch just a whisker it was smooth. so my thought is the clutch plates are causing it to be a little stiff. Nature of the beast I guess. Because all else seems fine.A curly spring washer would probably do the trick like it did on the RA axis but they tell me they don't make one for the Dec axis. So I guess it is what it is.
Greg
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Re: G11 Polar Alignment hole
The inner rotating shaft turns inside the fixed outer housing. When I first took off that plug I noticed the hole was almost half covered. Then wen I starting playing with the HC I saw why...A hole is a hole, ain't a hole...
RB
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Re: Imaging west of the meridian - suggestions.
I think my concerns may have more to do with balancing (the OTA side will now need to be heavy) as well as motor clearances.
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Re: G11 Polar Alignment hole
A round hole drilled through a round shaft makes an appearance of an oval hole only when observed under an angle!! If observed in the direction in which it was drilled, it appears as a round hole!!
?
A round hole is drilled through a round shaft makes an appearance of an egg shaped hole around the surface of the round shaft. Nels
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Re: G11 Polar Alignment hole
Yes...we all have this design of the polar bore hole.??
I always wondered why...? I think it is the same kind of offset with the Meade LXD55 mount, but the Orion/Synta Atlas bores it exactly perpendicular....I was expecting it to be perpendicular.? ? ?
At least it is not an egg-shaped hole!??
Best,
On Oct 7, 2017 08:47, "Nels Johnson nhbj6@... [Losmandy_users]" < Losmandy_users@...> wrote:
?
A round hole is drilled through a round shaft makes an appearance of an egg shaped hole around the surface of the round shaft. Nels
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Re: G11 Polar Alignment hole
A round hole is drilled through a round shaft makes an appearance of an egg shaped hole around the surface of the round shaft. Nels
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Re: G11 Polar Alignment hole
I have the same problem with my G11. the hole in the DEC axis shaft is only aligned with the hole in the DEC housing when I rotate the DEC by approximately 12 degrees. I'm using a Polar Master to align my mount so it does not effect my polar alignment. Peter 2017-10-07 4:36 GMT+02:00 f4chief73@... [Losmandy_users] < Losmandy_users@...>:
Well, after my lame comment i realized after I connected the Gemini 2
controller, and ran the servo's with the cap, did I realize when the scope
did it's thing the dec shaft is turning inside the outer mount housing
giving that effect. Duh, disregard my post...
Beachbum53
[Non-text portions of this message have been removed]
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Re: G11 Polar Alignment hole
Well, after my lame comment i realized after I connected the Gemini 2 controller, and ran the servo's with the cap, did I realize when the scope did it's thing the dec shaft is turning inside the outer mount housing giving that effect. Duh, disregard my post...
Beachbum53
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Re: G11 Polar Alignment hole
RB,
If you are saying the threads in the black RA clutch? knob are not round and the polar scope opening is also not round this is not likely because you probably could not use the knob to adjust the clutch pressure. So I think you are talking about the actual opening bored through the DEC axis axle shaft which is exposed when the caps are removed.?If you use a caliper or steel rule I think you might find the opening in the DEC axle is probably not egg shaped but round, this is probably a illusion given by the hole having been bored perpendicularly across a round axle shaft. Additionally the opening in the DEC axle is not intended for the polar scope to physically pass through but allows the polar scope optics an unobstructed view on the RA axis of the mount for polar alignment on the NCP. I hope this helps.
Chip??
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Hi,
The serial numbers for G11 and GM8s are found under the round base of the mount head.?
Chip
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Where can I locate the serial number on the Losmandy mount. I'm trying to register this. Thank You
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Update: I believe that the problem is solved. It appears that it was a faulty network cable. Because of your comments, I had a lot of options to consider, now and in the future with other problems. Thanks to you, I have examined for the first time my safety limits and realzed that Gemini 2 default limits are way off from what I need for my telescope and camera,. Man, am I ever grateful for clutches.
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Re: G11 Polar Alignment hole
Mine don¡¯t appear egg-shaped, so I¡¯m not sure what that¡¯s about either. ? ? ? Thanks ? Brian ? ? Brian Valente Brianvalentephotography.com ?
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From: Losmandy_users@... [mailto:Losmandy_users@...]
Sent: Thursday, October 5, 2017 7:20 PM
To: Losmandy_users@...
Subject: Re: [Losmandy_users] Re: G11 Polar Alignment hole? ? Very interesting... and puzzling.? My CG11 has round holes up the RA axis, but (as another owner just wrote) the holes through the counterweight shaft are not lined up with the RA axis at the CWD position.... it requires a slight rotation of DEC from CWD to get the polar scope bore-sight hole to line up.? ?But the holes and RA axis bore are not egg-shaped.?? I can't imagine what the egg-shaped hole could be from.... normally machine-shop equipment does not make such holes!? ? Please post a photo of that in the group's Files sections... then let us know the path to that photo... I'd call Losmandy and ask about that (better if you have your mount's serial number if you can get to that).?? ? On Thu, Oct 5, 2017 at 7:07 PM, f4chief73@... [Losmandy_users] <Losmandy_users@...> wrote: ? The Polar scope has one black cap, and one silver knurled plug covering the mounting hole for the scope.
Take off those two caps and the hole is not true. It's egg shaped not round... I really don't need the Polar scope, but if a person did, it would never fit in that egg shaped hole. I have a photo of it, but don't know how to post it here. That's the best I can explain it. It doesn't affect the scope performance, but I was just wondering why it was like this.
RB
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Re: G11 Polar Alignment hole
Very interesting... and puzzling.? My CG11 has round holes up the RA axis, but (as another owner just wrote) the holes through the counterweight shaft are not lined up with the RA axis at the CWD position.... it requires a slight rotation of DEC from CWD to get the polar scope bore-sight hole to line up.? ?But the holes and RA axis bore are not egg-shaped.??
I can't imagine what the egg-shaped hole could be from.... normally machine-shop equipment does not make such holes!? ?
Please post a photo of that in the group's Files sections... then let us know the path to that photo... I'd call Losmandy and ask about that (better if you have your mount's serial number if you can get to that).??
Best, Michael
On Thu, Oct 5, 2017 at 7:07 PM, f4chief73@... [Losmandy_users] <Losmandy_users@...> wrote:
?
The Polar scope has one black cap, and one silver knurled plug covering the mounting hole for the scope.
Take off those two caps and the hole is not true. It's egg shaped not round... I really don't need the Polar scope, but if a person did, it would never fit in that egg shaped hole. I have a photo of it, but don't know how to post it here. That's the best I can explain it. It doesn't affect the scope performance, but I was just wondering why it was like this.
RB
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Re: G11 Polar Alignment hole
The Polar scope has one black cap, and one silver knurled plug covering the mounting hole for the scope.
Take off those two caps and the hole is not true. It's egg shaped not round... I really don't need the Polar scope, but if a person did, it would never fit in that egg shaped hole. I have a photo of it, but don't know how to post it here. That's the best I can explain it. It doesn't affect the scope performance, but I was just wondering why it was like this.
RB
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Re: Imaging west of the meridian - suggestions.
I would not expect any trouble.? Just be sure to set your western limit so in case of unattended operation, your scope will not crash into your mount.??
Best, Michael?
On Oct 5, 2017 16:16, " f@... [Losmandy_users]" < Losmandy_users@...> wrote:
?
Any suggestions for imaging on the west side of the meridian? Things to look out for? Any recommended mods for my G-11?
For years I have used my G-11 to image east of the meridian to about 1-1/2 hours west of the meridian. I have trees and other obstructions so going any further west and/or meridian flips were never needed. Also, as a result, I was always able to keep the east (counterweight) side heavy.
Fast forward to next year. I will be moving my observatory to a site a few miles SW of Cody, WY. So Cody's light dome will be in the north east (which is the azimuth where I start my night long runs today), however to the south and west there is just back sky where the Milkyway runs down into the horizon. That is where I intend to image after the move... So, my imaging runs will most likely start ¡Ö1-1/2 hours east of the meridian and end just above the western horizon.
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photon_trap
Michael Herman