Re: Re : [ap-gto] 1600 Gear Mesh


Apr 4, 2014

 


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#43603 Apr 4, 2014

Jim,

maybe some flexure in the scope, or the focuser assembly?

Gilles

Gilles COHEN

www.ovision.com/Gilles_Home.html







-----E-mail d'origine-----

De : James Janusz jjanusz@...>

A: ap-gto ap-gto@yahoogroups.com>

Envoy. le : Ve, 4 Avr 2014 20:44

Sujet : Re: [ap-gto] 1600 Gear Mesh



 Hi Roland.  Good to know about the yearly maintenance. Unfortunately, the mount is unbalanced to the weight shaft side.  AsI said, the mount never did that before until the other night. Nothing has changed but I'm now losing a few subs during the nightto this problem.  Last night only one sub failed at around 10:30 andthe object transited at 10:42.  It sometimes also happens on thefirst one or two subs with the object about 40 degrees and rising.  Last night I waited until it was at 50 degrees and no failures.  I'mnow done with this object so it will be interesting to see if thiscontinues.  I did make one mistake in my original email.  The 1600has only been in since October 2013.  But has worked flawlesslyuntil now.

Based on what I have given you, what is your best idea to thecause?  Remote observatories do have their issues.

Jim

On 4/4/2014 9:59 AM, chris1011@...wrote:

Check your gearmesh about once per year. Add some lube tothe spur gears inside the gearbox also. One way to avoid what you are seeing is to unbalance the RAaxis by a few pounds (make the counterweights a bit heavy).That way the gear teeth will always be engaged and won't floatin between. The problem that you report will go away. Rolando-----Original Message-----From: James Janusz jjanusz@...>To: ap-gto ap-gto@yahoogroups.com>Sent: Thu, Apr 3, 2014 8:34 pmSubject: [ap-gto] 1600 Gear Mesh

Question for the AP guys.

If you have one of the newer AP mounts, located in a permanent observatory, should you periodically reset the gear mesh?

I ask this because my 1600, which has been close to perfect since 2012, has recently started to move about 5 pixels east in RA and then a few minutes later about 5 pixels west in RA. I confirmed that it is RA by moving it E & W with the Ascom Driver. This started happening a few nights ago near the east meridian. It is now happening regularly on the first one or two eastern images and then randomly during the night. Once the object crosses the meridian it seems to stop. The observatory is remote and no one has been inside in months.

Any ideas?

Jim



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#43613 Apr 4, 2014

It's a separate guide scope so that is a possibility.. I'll have tocheck it next time I'm out there.



Thanks Gilles.



Jim

On 4/4/2014 12:16 PM, Gilles COHENwrote:

Jim,

maybe some flexure in the scope, or the focuser assembly?



Gilles

Gilles COHEN

www.ovision.com/Gilles_Home.html







-----E-mail d'origine-----

De : James Janusz jjanusz@...>

A: ap-gto ap-gto@yahoogroups.com>

Envoy. le : Ve, 4 Avr 2014 20:44

Sujet : Re: [ap-gto] 1600 Gear Mesh



. Hi Roland.. Good to know about the yearlymaintenance.. Unfortunately, the mount isunbalanced to the weight shaft side.. As I said,the mount never did that before until the othernight.. Nothing has changed but I'm now losing afew subs during the night to this problem.. Lastnight only one sub failed at around 10:30 andthe object transited at 10:42.. It sometimesalso happens on the first one or two subs withthe object about 40 degrees and rising... Lastnight I waited until it was at 50 degrees and nofailures.. I'm now done with this object so itwill be interesting to see if this continues.. Idid make one mistake in my original email.. The1600 has only been in since October 2013.. Buthas worked flawlessly until now.



Based on what I have given you, what is yourbest idea to the cause?. Remote observatories dohave their issues.



Jim



On 4/4/2014 9:59 AM,chris1011@...wrote:

Check your gearmesh about once per year.Add some lube to the spur gears inside thegearbox also..One way to avoid what you are seeing isto unbalance the RA axis by a few pounds(make the counterweights a bit heavy). Thatway the gear teeth will always be engagedand won't float in between. The problem thatyou report will go away..Rolando-----OriginalMessage-----

From: James Janusz jjanusz@...>

To: ap-gto ap-gto@yahoogroups.com>

Sent: Thu, Apr 3, 2014 8:34 pm

Subject: [ap-gto] 1600 Gear Mesh

Question for the AP guys.

If you have one of the newer AP mounts, located in a permanent observatory, should you periodically reset the gear mesh?

I ask this because my 1600, which has been close to perfect since 2012, has recently started to move about 5 pixels east in RA and then a few minutes later about 5 pixels west in RA. I confirmed that it is RA by moving it E & W with the Ascom Driver. This started happening a few nights ago near the east meridian. It is now happening regularly on the first one or two eastern images and then randomly during the night. Once the object crosses the meridian it seems to stop. The observatory is remote and no one has been inside in months.

Any ideas?

Jim



---------------

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----------------------------

#43617 Apr 4, 2014

Another item to consider is the tightness of all your bolts and screws.  The day and night thermal expansion can loosen bolts and screws.  In my case the bolts holding the dovetail plate to the mount loosened a little.  It was not very loose, but it did affect the tracking.  The errors disappeared after tightening everything.

Alan

Sent from my iPad

On Apr 4, 2014, at 4:57 PM, James Janusz jjanusz@...> wrote:



It's a separate guide scope so that is a possibility.  I'll have tocheck it next time I'm out there.



Thanks Gilles.



Jim

On 4/4/2014 12:16 PM, Gilles COHENwrote:

Jim,

maybe some flexure in the scope, or the focuser assembly?



Gilles

Gilles COHEN

www.ovision.com/Gilles_Home.html







-----E-mail d'origine-----

De : James Janusz jjanusz@...>

A: ap-gto ap-gto@yahoogroups.com>

Envoy. le : Ve, 4 Avr 2014 20:44

Sujet : Re: [ap-gto] 1600 Gear Mesh



  Hi Roland.  Good to know about the yearlymaintenance.  Unfortunately, the mount isunbalanced to the weight shaft side.  As I said,the mount never did that before until the othernight.  Nothing has changed but I'm now losing afew subs during the night to this problem.  Lastnight only one sub failed at around 10:30 andthe object transited at 10:42.  It sometimesalso happens on the first one or two subs withthe object about 40 degrees and rising.   Lastnight I waited until it was at 50 degrees and nofailures.  I'm now done with this object so itwill be interesting to see if this continues.  Idid make one mistake in my original email.  The1600 has only been in since October 2013.  Buthas worked flawlessly until now.



Based on what I have given you, what is yourbest idea to the cause?  Remote observatories dohave their issues.



Jim



On 4/4/2014 9:59 AM,chris1011@...wrote:

Check your gearmesh about once per year.Add some lube to the spur gears inside thegearbox also. One way to avoid what you are seeing isto unbalance the RA axis by a few pounds(make the counterweights a bit heavy). Thatway the gear teeth will always be engagedand won't float in between. The problem thatyou report will go away. Rolando-----OriginalMessage-----

From: James Janusz jjanusz@...>

To: ap-gto ap-gto@yahoogroups.com>

Sent: Thu, Apr 3, 2014 8:34 pm

Subject: [ap-gto] 1600 Gear Mesh

Question for the AP guys.

If you have one of the newer AP mounts, located in a permanent observatory, should you periodically reset the gear mesh?

I ask this because my 1600, which has been close to perfect since 2012, has recently started to move about 5 pixels east in RA and then a few minutes later about 5 pixels west in RA. I confirmed that it is RA by moving it E & W with the Ascom Driver. This started happening a few nights ago near the east meridian. It is now happening regularly on the first one or two eastern images and then randomly during the night. Once the object crosses the meridian it seems to stop. The observatory is remote and no one has been inside in months.

Any ideas?

Jim



---------------

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