Re: [ap-gto] 1600gto dec gears "singing"


Aug 18, 2017

 


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#57985 Aug 18, 2017

Hi,



I've just done the prescribed gear mesh adjustments on my 1600GTO mount

which is about 3 years old. After storage and some shipping shakeups,

there was sone backlash. The adjustments worked fine from a backlash

perspective, but my dec axis has developed a metallic singing sound

which I expect is the worm gear resonating(?) maybe.......



Since the ringing only occurs in the final 20 degrees as the scope lays

down into park4, I thought it might be a balance issue, however, as I

apply more or less weight by hand, the sound does not change. I've

obviously adjusted this noise into existence...I'm wondering if this a

known issue and if there is guidance available to an adjustment that

satisfies the backlash needs AND doesn't create unusual noises. In my

limited experience, shrieking and howling gear trains are not a good

thing........



many thanks



John Collins



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#57986 Aug 18, 2017

Hi John, ��If the sound is coming from the RA axis, I would loosen the gear mesh a tiny amount.�� Remember that backlash is NOT an issue in RA, unless it has reached a ridiculouslevel.�� RA is always driven, so the backlash effects from direction reversal don.t come into play.�� It is more important to have smooth, effortless operation for good tracking.If the sound seems to be in declination, we can work on it after the eclipse break.�� AP will be closed Monday and Tuesday, but I.ll be back on Wednesday, andGeorge will join me on Thursday or Friday. ��Mag. 7 Skies! ��Howard HedlundAstro-Physics, Inc.Phone: 815-282-1513www.astro-physics.comPlease include this e-mail with your response. ��PConsider the environment before printing this e-mail. ��

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

Sent: Friday, August 18, 2017 9:42 PM

To: ap-gto@yahoogroups.com

Subject: [ap-gto] 1600gto dec gears "singing"



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#57988 Aug 18, 2017

Thanks Howard--I will be in contact on Wednesday.. Happyeclipsing!John Collins---------------



On 8/18/2017 3:53 PM, Howardhoward@... [ap-gto] wrote:

HiJohn, .Ifthe sound is coming from the RA axis, I would loosen thegear mesh a tiny amount.. Remember that backlash is NOT anissue in RA, unless it has reached a ridiculous level.. RAis always driven, so the backlash effects from directionreversal don.t come into play.. It is more important to havesmooth, effortless operation for good tracking.Ifthe sound seems to be in declination, we can work on itafter the eclipse break.. AP will be closed Monday andTuesday, but I.ll be back on Wednesday, and George will joinme on Thursday or Friday. .Mag.7 Skies! .HowardHedlundAstro-Physics,Inc.Phone:815-282-1513www.astro-physics.comPleaseinclude this e-mail with your response. .PConsiderthe environment before printing this e-mail. .

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

Sent: Friday, August 18, 2017 9:42 PM

To: ap-gto@yahoogroups.com

Subject: [ap-gto] 1600gto dec gears "singing"



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