Re: [ap-gto] 1200GTO noisy DEC


Mar 24, 2015

 


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#47403 Mar 24, 2015

I have put this out here before but the DEC motor/gear trainmakes a persistent “clicking” when the  mount is slewing inDEC.  This noise is rhythmic meaning it will go “click click”…fewsecond break then repeats.  Correlated with slew speed…1200X is morefrequent and louder than 600X slew speed.  On Roland’s advice,greased the pinion gears with Aeroshell some time ago, this made no difference.  The mount is carrying a Planewave CDK14/Optec 3” Pyxisrotater/Optec TCFS-3 focuser and ST10XE camera and filter wheel, clearly withinthe weight limit of the mount.  There is a  very slight imbalance in DEC but notmuch.  Seems to track and slew OK but the clicking is bothersome.  Any additional ideas, checks, adjustments?  Mike J. Shade: mshade@...Mike J. Shade Photographymshadephotography.comIn War: ResolutionIn Defeat: DefianceIn Victory: MagnanimityIn Peace: GoodwillSir Winston ChurchillAlready, in the gathering dusk, a fewof the stars are turning on their lights.

Vega, the brightest one, is now dropping toward the west.  Can it be half

a year since I watched her April rising in the east?  Low down in the

southwest Antares blinks a sad farewell to fall...

Leslie Peltier, Starlight Nights



International Dark Sky Association: www.darksky.org



"I like the dark, it's cheap" Ebenezer Scrooge      



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#47405 Mar 24, 2015

Mike,     Some suggestions about sleuthing out the cause.     To isolate the cause of the clicking . try to determinewhether is it coming just from the gearbox,  or from the DEC axle rotationmeshed with the worm. Is there a clicking when you loosen the clutches andmanually rotate the DEC? Put a pencil mark on the DEC head,  next to itssetting circle, to indicate the exact DEC coordinate on the circle, that thesound begins then goes away . and if it is repetitive at the same spot(s) - i.e.DEC position angle. - or if it is a random position. If random, then perhaps itis not associated with the gearbox, since the gear positions are preciselyrepetitive.     Maybe just remove the gearbox  cover, listenclosely to see if the sound emanates from just one of the two gears . perhapsone of them is slightly stripped or slightly wobbly, and takes a few revolutionsof its spur gear mate to .push it. past the bad spot. Your observation that ...there is a .few seconds break between repeats of the clicks and louder at higherspeed. might support the bad spur gear proposition. I would unmesh the DEC completely, and then slew just the gearbox by itself(at high speed), and listen for that click pattern . i.e. bad spur gear.       If not present, then it might be associatedwith the actual movement of the DEC axle, and its associated bearings or thecircle of rollers (identical to the clutch plugs) . you can see the whiterollers inside,  when you unmesh, or remove the gearbox. If you still can.tidentify the source of the clicks, maybe swap the gearboxes, and see if theclicking moves with it to the RA axle. If it does, then it is not being causedby the DEC axle, but by one of the gears inside the gearbox.     Good opportunity, with the gearboxes removed, to cleanup the old grease,  and grease the worms with AeroShell. Joe



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#47415 Mar 24, 2015

MikeI had/have a similar noise in the RA axis on my AP900 GOTO last summer. It only showed up when slewing at high speed and only when slewing in one direction which seemed to indicate there was something stuck on one side of one of the teeth in one of the gears in the RA gearbox. The relatively high frequency of the clicking sound indicated it was likely in either the first or second intermediate gears in the RA gearbox. I took the gears out and cleaned the teeth of all the gears with a toothpick. I inspected all the gear teeth with a strong magnifying glass. I never found anything. I re-greased the gears and put everything back together and it still made the sound. I decided to just leave it alone since it didn't interfere with mount tracking or other operations. As time went on, the clicking sound got less and less and is now barely noticeable. If I were you, I wouldn't worry about it unless the mount operation has been negatively affected.Don Anderson 

From: "'Mike Shade' mshade@... [ap-gto]" ap-gto@yahoogroups.com> To: ap-gto@yahoogroups.com Sent: Tuesday, March 24, 2015 2:50 PM Subject: [ap-gto] 1200GTO noisy DEC

 I have put this out here before but the DEC motor/gear trainmakes a persistent .clicking. when the  mount is slewing inDEC.  This noise is rhythmic meaning it will go .click click..fewsecond break then repeats.  Correlated with slew speed.1200X is morefrequent and louder than 600X slew speed.  On Roland.s advice,greased the pinion gears with Aeroshell some time ago, this made no difference.  The mount is carrying a Planewave CDK14/Optec 3. Pyxisrotater/Optec TCFS-3 focuser and ST10XE camera and filter wheel, clearly withinthe weight limit of the mount.  There is a  very slight imbalance in DEC but notmuch.  Seems to track and slew OK but the clicking is bothersome.  Any additional ideas, checks, adjustments?  Mike J. Shade: mshade@...Mike J. Shade Photographymshadephotography.comIn War: ResolutionIn Defeat: DefianceIn Victory: MagnanimityIn Peace: GoodwillSir Winston ChurchillAlready, in the gathering dusk, a fewof the stars are turning on their lights.

Vega, the brightest one, is now dropping toward the west.  Can it be half

a year since I watched her April rising in the east?  Low down in the

southwest Antares blinks a sad farewell to fall...

Leslie Peltier, Starlight Nights



International Dark Sky Association: www.darksky.org



"I like the dark, it's cheap" Ebenezer Scrooge      



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#47417 Mar 24, 2015

Is your mount operating ok though?

From: "'Mike Shade' mshade@... [ap-gto]" ap-gto@yahoogroups.com> To: ap-gto@yahoogroups.com Sent: Tuesday, March 24, 2015 10:57 PM Subject: RE: [ap-gto] 1200GTO noisy DEC

 Thanks Don.there seems to be two clicks, one then a slightly dimmer one and then about a two second delay and then it repeats.I seem to recall this doing it for some time now, and is correlated to mount slew. I have a slight imbalance in DEC, will rectify that and see if it makes any difference, which I doubt. When monsoon shuts me down here in SE AZ in a few months I may send it back to AP.



From: ap-gto@yahoogroups.com [mailto:ap-gto@yahoogroups.com]

Sent: Tuesday, March 24, 2015 9:51 PM

To: ap-gto@yahoogroups.com

Subject: Re: [ap-gto] 1200GTO noisy DEC



Mike



I had/have a similar noise in the RA axis on my AP900 GOTO last summer. It only showed up when slewing at high speed and only when slewing in one direction which seemed to indicate there was something stuck on one side of one of the teeth in one of the gears in the RA gearbox. The relatively high frequency of the clicking sound indicated it was likely in either the first or second intermediate gears in the RA gearbox. I took the gears out and cleaned the teeth of all the gears with a toothpick. I inspected all the gear teeth with a strong magnifying glass. I never found anything. I re-greased the gears and put everything back together and it still made the sound. I decided to just leave it alone since it didn't interfere with mount tracking or other operations. As time went on, the clicking sound got less and less and is now barely noticeable. If I were you, I wouldn't worry about it unless the mount operation has been negatively affected.



Don Anderson



_____



From: "'Mike Shade' mshade@... [ap-gto]" ap-gto@yahoogroups.com>

To: ap-gto@yahoogroups.com

Sent: Tuesday, March 24, 2015 2:50 PM

Subject: [ap-gto] 1200GTO noisy DEC



I have put this out here before but the DEC motor/gear train makes a persistent .clicking. when the mount is slewing in DEC. This noise is rhythmic meaning it will go .click click..few second break then repeats. Correlated with slew speed.1200X is more frequent and louder than 600X slew speed. On Roland.s advice, greased the pinion gears with Aeroshell some time ago, this made no difference.



The mount is carrying a Planewave CDK14/Optec 3. Pyxis rotater/Optec TCFS-3 focuser and ST10XE camera and filter wheel, clearly within the weight limit of the mount.



There is a very slight imbalance in DEC but not much. Seems to track and slew OK but the clicking is bothersome.



Any additional ideas, checks, adjustments?



Mike J. Shade: mshade@...



Mike J. Shade Photography



mshadephotography.com



In War: Resolution



In Defeat: Defiance



In Victory: Magnanimity



In Peace: Goodwill



Sir Winston Churchill



Already, in the gathering dusk, a few of the stars are turning on their lights.

Vega, the brightest one, is now dropping toward the west. Can it be half

a year since I watched her April rising in the east? Low down in the

southwest Antares blinks a sad farewell to fall...

Leslie Peltier, Starlight Nights



International Dark Sky Association: www.darksky.org www.darksky.org/>



"I like the dark, it's cheap" Ebenezer Scrooge



_____



No virus found in this message.

Checked by AVG - www.avg.com

Version: 10.0.1434 / Virus Database: 4257/8870 - Release Date: 03/24/15



[Non-text portions of this message have been removed]







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#47418 Mar 24, 2015

MikeAnother thought. Some of the gears are plastic and some aluminum. I wonder if the coming and going of these gearbox noises isn't related to the meshing of the two different materials. As the plastic and aluminum teeth of these gears wear in, one may get strange noised from time to time. Again, unless you are seeing degraded mount performance, I wouldn't worry about it. When I posted on this some time back, Rolando replied and suggested that it wasn't something to worry about.RegardsDon Anderson

From: Don Anderson jockey_ca@...> To: "ap-gto@yahoogroups.com" ap-gto@yahoogroups.com> Sent: Tuesday, March 24, 2015 11:00 PM Subject: Re: [ap-gto] 1200GTO noisy DEC

Is your mount operating ok though?





From: "'Mike Shade' mshade@... [ap-gto]" ap-gto@yahoogroups.com> To: ap-gto@yahoogroups.com Sent: Tuesday, March 24, 2015 10:57 PM Subject: RE: [ap-gto] 1200GTO noisy DEC

 Thanks Don.there seems to be two clicks, one then a slightly dimmer one and then about a two second delay and then it repeats.I seem to recall this doing it for some time now, and is correlated to mount slew. I have a slight imbalance in DEC, will rectify that and see if it makes any difference, which I doubt. When monsoon shuts me down here in SE AZ in a few months I may send it back to AP.



From: ap-gto@yahoogroups.com [mailto:ap-gto@yahoogroups.com]

Sent: Tuesday, March 24, 2015 9:51 PM

To: ap-gto@yahoogroups.com

Subject: Re: [ap-gto] 1200GTO noisy DEC



Mike



I had/have a similar noise in the RA axis on my AP900 GOTO last summer. It only showed up when slewing at high speed and only when slewing in one direction which seemed to indicate there was something stuck on one side of one of the teeth in one of the gears in the RA gearbox. The relatively high frequency of the clicking sound indicated it was likely in either the first or second intermediate gears in the RA gearbox. I took the gears out and cleaned the teeth of all the gears with a toothpick. I inspected all the gear teeth with a strong magnifying glass. I never found anything. I re-greased the gears and put everything back together and it still made the sound. I decided to just leave it alone since it didn't interfere with mount tracking or other operations. As time went on, the clicking sound got less and less and is now barely noticeable. If I were you, I wouldn't worry about it unless the mount operation has been negatively affected.



Don Anderson



_____



From: "'Mike Shade' mshade@... [ap-gto]" ap-gto@yahoogroups.com>

To: ap-gto@yahoogroups.com

Sent: Tuesday, March 24, 2015 2:50 PM

Subject: [ap-gto] 1200GTO noisy DEC



I have put this out here before but the DEC motor/gear train makes a persistent .clicking. when the mount is slewing in DEC. This noise is rhythmic meaning it will go .click click..few second break then repeats. Correlated with slew speed.1200X is more frequent and louder than 600X slew speed. On Roland.s advice, greased the pinion gears with Aeroshell some time ago, this made no difference.



The mount is carrying a Planewave CDK14/Optec 3. Pyxis rotater/Optec TCFS-3 focuser and ST10XE camera and filter wheel, clearly within the weight limit of the mount.



There is a very slight imbalance in DEC but not much. Seems to track and slew OK but the clicking is bothersome.



Any additional ideas, checks, adjustments?



Mike J. Shade: mshade@...



Mike J. Shade Photography



mshadephotography.com



In War: Resolution



In Defeat: Defiance



In Victory: Magnanimity



In Peace: Goodwill



Sir Winston Churchill



Already, in the gathering dusk, a few of the stars are turning on their lights.

Vega, the brightest one, is now dropping toward the west. Can it be half

a year since I watched her April rising in the east? Low down in the

southwest Antares blinks a sad farewell to fall...

Leslie Peltier, Starlight Nights



International Dark Sky Association: www.darksky.org www.darksky.org/>



"I like the dark, it's cheap" Ebenezer Scrooge



_____



No virus found in this message.

Checked by AVG - www.avg.com

Version: 10.0.1434 / Virus Database: 4257/8870 - Release Date: 03/24/15



[Non-text portions of this message have been removed]


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