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Equipment Discussions >> Mounts

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mistyridge
Post Laureate
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Reged: 10/28/05

Loc: Loomis, CA
The future of mounts--any thoughts?
      #4386458 - 02/14/11 06:02 PM

I just finished skimming the latest issue of ATT and was struck by what I see as a trend in mounts. Spcifically self aligning technology such as the new Celestron Prodigy and Mead Lightswitch may lead to larger capacity high end mounts suitable for AP. Will GEMs become obsolete? Will having to do polar alignment be a thing of the past? Will we see portable self aligning harmonic drive mounts, light weight with no counter weights?

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Astrojensen
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Reged: 10/05/08

Loc: Bornholm, Denmark
Re: The future of mounts--any thoughts? new [Re: mistyridge]
      #4386491 - 02/14/11 06:24 PM

Quote:

Spcifically self aligning technology such as the new Celestron Prodigy and Mead Lightswitch may lead to larger capacity high end mounts suitable for AP.




Why would these small self-aligning mounts lead to big mounts suitable for astrophotography? They are made for very different markets.

Quote:

Will having to do polar alignment be a thing of the past?




Not if you want to do long-exposure photography with no field rotation, but I think there's a good chance that mounts will be developed that can do it themselves with very, VERY high accuracy. All it would take was some motors on the altitude and azimut adjustments on a GEM, a CCD camera and a computer that could talk with the camera, the mount and the adjustment motors and then run an automated drift alignment procedure. Given the sensitivity of the CCD, it could probably be done in a few minutes.

Quote:

Will we see portable self aligning harmonic drive mounts, light weight with no counter weights?




Interesting. Maybe, I'd say, but not likely in the next five years. Still too expensive.

Quote:

Will GEMs become obsolete?




Hardly.


Clear skies!
Thomas, Denmark


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Frank Boreas
member


Reged: 11/02/10

Loc: Northern Wisconsin
Re: The future of mounts--any thoughts? new [Re: mistyridge]
      #4386494 - 02/14/11 06:26 PM

Did astrophotography make eyepieces obsolete?

Did goto make starhopping a thing of the past?

For some yes, but I suspect there will always be some like me that enjoy simple setups and observing au natural.

Edited by Frank Boreas (02/14/11 06:27 PM)


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skybsd
Post Laureate
*****

Reged: 02/01/08

Re: The future of mounts--any thoughts? new [Re: mistyridge]
      #4386528 - 02/14/11 06:42 PM

Reminds me of the kind of stuff my Dad told me they were told back in the '60s - good thing he didn't hold his breadth waiting for those personal hovercrafts

Regards,

skybsd


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EJN
Carpal Tunnel
*****

Reged: 11/01/05

Loc: 53 miles west of Venus
Re: The future of mounts--any thoughts? new [Re: mistyridge]
      #4386556 - 02/14/11 07:00 PM

In the future, as mental powers improve, people will learn to
levitate their telescopes using psychic energy and mounts will
be unnecessary.


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tjugo
scholastic sledgehammer


Reged: 11/06/07

Re: The future of mounts--any thoughts? new [Re: EJN]
      #4386969 - 02/14/11 10:21 PM

Some of the newer mounts (ASA) don't need to be autoguide... At least I expect in the next 5 years a mount in the class of CGEM/Atlas that won't need to be autoguided...

Cheers,

Jose


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mistyridge
Post Laureate
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Reged: 10/28/05

Loc: Loomis, CA
Re: The future of mounts--any thoughts? new [Re: tjugo]
      #4387267 - 02/15/11 02:37 AM

I guess we are doomed to be stuck in the past. Look to China for innovation.

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Chris Lyons
member


Reged: 12/28/09

Loc: Baltimore
Re: The future of mounts--any thoughts? new [Re: tjugo]
      #4387303 - 02/15/11 03:33 AM

Hi Jose!
My A.S.A. DDM-85 does need to be autoguided beyond
around 30-40 mins but that's probably a result
of flexure in my OTA rings. Getting rid of that
is proving to be a bear!
The DDM-85 could probably go without guiding for
hours if the flexure issue was banished but how
long in reality I couldn't say. Not yet anyhow!
This direct drive tech is mind blowing and there
is no going back now to anything less.
The future of mount tech is BRIGHT!
Chris Lyons.


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Waxing Gibbous
professor emeritus


Reged: 11/19/10

Loc: Victoria, Australia
Re: The future of mounts--any thoughts? new [Re: Chris Lyons]
      #4387543 - 02/15/11 08:37 AM

Built-in guidscopes with both spectroscopic and pattern recognition, linked of course to the mount's PEC software?

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Ad Astra
professor emeritus
*****

Reged: 05/12/10

Loc: Riverside Co., California
Re: The future of mounts--any thoughts? new [Re: Waxing Gibbous]
      #4388737 - 02/15/11 06:29 PM

I'd love to see a titanium edition of something like the AP-900 mount. That mount disassembles into two hefty pieces, a titanium edition would be very strong, and very light weight as well.

Just a thought!!

Dan


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BPO
sage


Reged: 02/23/10

Loc: South Island, NZ
Re: The future of mounts--any thoughts? new [Re: Chris Lyons]
      #4388757 - 02/15/11 06:38 PM

Chris, I've been communicating with a university that operates a few DDM-85 mounts and they were limited to approximately 45 minute unguided exposures due to OTA truss rigidity problems, which they are still attempting to resolve.

However, another user solved his flexure conundrum by replacing all stock bolts and fasteners with much higher quality ones, and is now able to achieve in excess of 90 minute unguided exposures, so it sounds as if you're on the right track with your problem solving quest.

Good luck, you have a heck of a mount there.


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avarakin
Carpal Tunnel
*****

Reged: 07/13/09

Loc: Parsippany NJ, USA
Re: The future of mounts--any thoughts? new [Re: BPO]
      #4388993 - 02/15/11 08:42 PM

How about Alt/Az mount with field de-rotator coming as part of the mount and controlled by main computer? I never used field de-rotator, but based on a mental experiment, I think that field de-rotator needs to have variable speed depending on point in the sky it is pointing to. Thus it needs to be controlled by main computer which drives other 2 motors. Once you have 3 axis controlled by a computer, there is no need to polar align such mount.
Advantages of such mount would be:
1. no need to do polar alignment, computer would just move all motors based on result of 2 or 3 star alignment procedure
2. since it is Alt/Az, there is no need for counterweight
3. A separate kit can be manufactured which fits a regular dob

Based on all this, a 24" amateur astrograph becomes a reality!
GEM is dead, long live Dob!

Alex


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orlyandico
Postmaster
*****

Reged: 08/10/09

Loc: Singapore
Re: The future of mounts--any thoughts? new [Re: avarakin]
      #4389130 - 02/15/11 09:51 PM

Meade already had such a field derotator on their larger LX200GPS models almost ten years ago.. it is as you describe, the alt-az computer also drove the motor on the derotator.

The famous Mel Bartels scope.exe DOS-based scope drive also has a provision for driving a field derotator in addition to the alt and az motors.


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Astrojensen
Post Laureate
*****

Reged: 10/05/08

Loc: Bornholm, Denmark
Re: The future of mounts--any thoughts? new [Re: avarakin]
      #4389587 - 02/16/11 04:38 AM

This Danish mount is an altaz with a innovative field rotator that rotates the entire telescope instead of just the camera. Has been tested by a Danish imager and the prototype worked almost flawlessly. I've seen it in person, it's rugged and will easily carry a TEC 140. There's also a bigger mount that will carry a much larger scope.

http://shop.trackthestars.com/product.asp?product=4

http://trackthestars.com/astro-photography.html?task=view


Clear skies!
Thomas, Denmark


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Jon Isaacs
Postmaster
*****

Reged: 06/16/04

Loc: San Diego and Boulevard, CA
Re: The future of mounts--any thoughts? new [Re: Ad Astra]
      #4389608 - 02/16/11 05:06 AM

Quote:

I'd love to see a titanium edition of something like the AP-900 mount. That mount disassembles into two hefty pieces, a titanium edition would be very strong, and very light weight as well.

Just a thought!!

Dan




Titanium is a good aterial when strength is important but strength is not important in a mount. The difference between strength and stiffness is important, strength is how much force it takes to fail the part, stiffness is how much it moves under a given force. What is important in a telescope mount is stiffness, that is measured by Young's modulus, if you pull on a 10 inch long, 1 square inch area with say 20,000 lbs, how far does it move??

There are three metals that are worth considering, steel, titanium and aluminum. What is interesting about these three materials is they all have essentially the same "specific stiffness", i.e. how much force will it take to deform 1 pound of each material, made into a piece 1 foot long, 0.002 inches? It takes about the same force for all three...

So what it turns out is that for equal weight parts, if one can take advantage of the geometric advantages that increase stiffness, then aluminum is generally the best choice. If one is constrained to specific dimensions, then steel is the better choice.

As an example, if the question is: If I have 2 pounds of material and I want the stiffest tripod leg that is 40 inches long, then aluminum is the material of choice. On the other hand, if I have 2 pounds of material and I want the stiffest tripod leg that is 40 inches long AND 1.75 inches in diameter, then steel is a somewhat better choice.

Jon


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alpal
Post Laureate


Reged: 06/15/09

Loc: Melbourne Australia.
Re: The future of mounts--any thoughts? new [Re: Jon Isaacs]
      #4389617 - 02/16/11 05:39 AM

I am hoping the EQ8 will be a good mount.
I might buy one if they are any good.
see youtube video:

http://www.youtube.com/watch?feature=player_embedded&v=Mg6WLerTKZg#at=18


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Astrojensen
Post Laureate
*****

Reged: 10/05/08

Loc: Bornholm, Denmark
Re: The future of mounts--any thoughts? new [Re: Jon Isaacs]
      #4389673 - 02/16/11 06:58 AM

Quote:

As an example, if the question is: If I have 2 pounds of material and I want the stiffest tripod leg that is 40 inches long, then aluminum is the material of choice. On the other hand, if I have 2 pounds of material and I want the stiffest tripod leg that is 40 inches long AND 1.75 inches in diameter, then steel is a somewhat better choice.




And if I have to build it myself in my small shop, then wood is the best choice!

Nice little lecture, Jon.


Clear skies!
Thomas, Denmark


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rjsc2000
sage


Reged: 09/21/06

Loc: Portugal
Re: The future of mounts--any thoughts? new [Re: Astrojensen]
      #4389759 - 02/16/11 08:18 AM

What about carbon? As seen in telescopes tubes made of it?

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Astrojensen
Post Laureate
*****

Reged: 10/05/08

Loc: Bornholm, Denmark
Re: The future of mounts--any thoughts? new [Re: rjsc2000]
      #4389809 - 02/16/11 08:56 AM

Carbon fiber materials can certainly be used for some parts of a mount, but it is not a material for the average ATM, for sure. Carbon dust must be kept far away from any electric tools, for example, or they will short circuit in a few moments after getting the carbon dust inside.

I am not sure if carbon materials can be die cast, like aluminum, so that you could cast axle housings, for example.


Clear skies!
Thomas, Denmark


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Peter Glus
sage
*****

Reged: 05/08/06

Re: The future of mounts--any thoughts? new [Re: Astrojensen]
      #4391626 - 02/16/11 10:21 PM

harmonic gears....thats the best invention yet for mounts

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