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Equipment Discussions >> Mounts

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denjo
professor emeritus
*****

Reged: 11/25/05

How cold is too cold
      #3550913 - 01/10/10 12:35 AM

When does your mount start getting unhappy with the cold?

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John J
professor emeritus
*****

Reged: 11/05/07

Loc: South East SD.
Re: How cold is too cold new [Re: denjo]
      #3550923 - 01/10/10 12:52 AM

My EQ 6 began to stall when slewing at 4 Deg F. It would track well though. It was completely covered in frost. I was an idiot to be out in that cold of weather, but the skies were pristine.
JJ


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coopfore1
super member


Reged: 11/23/05

Loc: il
Re: How cold is too cold new [Re: John J]
      #3550957 - 01/10/10 01:25 AM

anyone have an idea on how to keep mounts warm?

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Smo
sage


Reged: 01/19/09

Loc: North Vancouver, BC, Canada
Re: How cold is too cold new [Re: coopfore1]
      #3551014 - 01/10/10 02:40 AM

I dont know but the AP mounts have videos of being at -73 degree celcius at the south pole and working fine. Check the video on the AP site.

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coopfore1
super member


Reged: 11/23/05

Loc: il
Re: How cold is too cold new [Re: Smo]
      #3551017 - 01/10/10 02:43 AM

Smo So how cold has your mount been???

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Smo
sage


Reged: 01/19/09

Loc: North Vancouver, BC, Canada
Re: How cold is too cold new [Re: coopfore1]
      #3551020 - 01/10/10 02:53 AM

just got it...and I live on the coast.

Here in Vancouver it usually doesn't drop below freezing...so around 1-2 degrees Celsius.

what 35 degree F?

Edited by Smo (01/10/10 02:55 AM)


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coopfore1
super member


Reged: 11/23/05

Loc: il
Re: How cold is too cold new [Re: Smo]
      #3551055 - 01/10/10 03:52 AM

Smo I saw you were in Canada. I thought you might have been in some colder weather than here in Illinois. Its -10 f here right now and my mount is not happy about it. I wanted to do some web cams of Mars, tonight, but its not going to happen....

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coopfore1
super member


Reged: 11/23/05

Loc: il
Re: How cold is too cold new [Re: coopfore1]
      #3551059 - 01/10/10 03:56 AM

Anyone else having problems ?

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Kaizu
sage


Reged: 08/17/07

Loc: Finland
Re: How cold is too cold new [Re: coopfore1]
      #3551089 - 01/10/10 04:39 AM

No problems with G11. Just "warm started" from -23C (-10F) and worked properly.

Kaizu


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Lane
Post Laureate


Reged: 11/19/07

Loc: Frisco, Texas
Re: How cold is too cold new [Re: Kaizu]
      #3551162 - 01/10/10 06:25 AM

On my celestron CGEM - At 21 degrees F the object information messages that scroll sideways across the hand controller screen are blurred. The words blur together because the previous word on the screen takes a full second to fade out. So you have 2 or sometimes 3 letters on top of each other. Almost impossible to read.

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Arbacia
Pooh-Bah
*****

Reged: 04/18/07

Loc: Madrid, Spain
Re: How cold is too cold new [Re: Lane]
      #3551191 - 01/10/10 07:00 AM

Lane, search for mods for heating the screen of the Nexstar hand control. It is necesary to keep warm enough the screen.

Alternatively, put the hand control inside of a warm pocket of your jacket (should be a good idea to use then a telephone extension cable 6p6C)or attach with a rubber band a hand warmer sac to the back of the nexstar Hand control.

Patricio


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galacticphoto
super member


Reged: 11/12/09

Loc: Huntsville, AL and Atlanta, Ga
Re: How cold is too cold new [Re: denjo]
      #3551378 - 01/10/10 09:53 AM

Never a problem w/ the MI-250 (uses the Gemini electronics as w/ Losmandy), but the Celestron HCs do have some problems (especially the display) if the temp is below 20 deg or so. Use the Laptop for control, and all is ok, since the mount still works fine.

Robert


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noah way
sage
*****

Reged: 11/04/09

Re: How cold is too cold new [Re: galacticphoto]
      #3551661 - 01/10/10 12:05 PM

I run out of cold tolerance long before the mount does.

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bseltzer
Pooh-Bah


Reged: 10/28/07

Loc: East S.F.Bay, CA
Re: How cold is too cold new [Re: noah way]
      #3551692 - 01/10/10 12:20 PM

Quote:

I run out of cold tolerance long before the mount does.




Amen, brother!

-Bert


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Telescopeman54
Vendor - Trapezium Telescopes & Services, LLC.
*****

Reged: 08/17/07

Loc: New Hampshire
Re: How cold is too cold new [Re: noah way]
      #3551694 - 01/10/10 12:21 PM

We were out last night in 0F temps with a 10 - 15 mph breeze. Finally caved in after 5-1/2 hours. The sky was quite clear but the seeing was horrible!

The Mini Towers and MT Pro which we were testing all worked well. They held up much better than we did even though we were wearing snow mobile suits and had heaters in our boots! I'm still trying to thaw out!

Steve


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rmollise
Postmaster
*****

Reged: 07/06/07

Re: How cold is too cold new [Re: coopfore1]
      #3551719 - 01/10/10 12:29 PM

Quote:

anyone have an idea on how to keep mounts warm?




Most often, it's not the mount you have to keep warm, it's the battery and hand controller. Most mounts begin to have trouble in the cold not because they are freezing up, but because cold puts an awful strain on batteries--voltage drops and the mount begins to have trouble. Hand controllers? Main problem is LCD displays, which start gettin' sluggish at about 32F.


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coopfore1
super member


Reged: 11/23/05

Loc: il
Re: How cold is too cold new [Re: rmollise]
      #3551771 - 01/10/10 12:52 PM

Thanks Rod, It was about -10 last night so it was pretty cold. The battery was showing full charge. Everytime I moved the scope in ra it would keep moving until power was shut down. Would this be consistant with power problem or motor sticking. The hand control was unreadable at one point. So I warmed it,but ra still would not work properly. Any ideas

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rmollise
Postmaster
*****

Reged: 07/06/07

Re: How cold is too cold new [Re: coopfore1]
      #3551987 - 01/10/10 02:44 PM

Quote:

Thanks Rod, It was about -10 last night so it was pretty cold. The battery was showing full charge. Everytime I moved the scope in ra it would keep moving until power was shut down. Would this be consistant with power problem or motor sticking. The hand control was unreadable at one point. So I warmed it,but ra still would not work properly. Any ideas




Yep, sounds like a power issue...and...yes...cold is hell on batteries.


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gnowellsct
Postmaster
*****

Reged: 06/24/09

Re: How cold is too cold new [Re: rmollise]
      #3552904 - 01/10/10 09:34 PM

http://groups.yahoo.com/group/extremeastronomy

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coopfore1
super member


Reged: 11/23/05

Loc: il
Re: How cold is too cold new [Re: gnowellsct]
      #3553271 - 01/11/10 01:24 AM

Thanks everyone. Well I powered the mount with a 4 amp power supply, instead of the battery. I am using a cigar lighter plug maybe thats the problem? I still have ra problem. I think I will wait for the temp to warm up before i mess with it any longer. Maybe Some moisture got into the connections, motor or hc...Thanks

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