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concrete pier + tripod extension -could this work?

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#1 Myles

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Posted 01 May 2011 - 05:27 PM

I posted this the Observatory forum and got one response so I thought I run by the Mounts forum readers.

I am looking to do pier for an observatory but need to have it work with my alt/az DiscMount-4 (4 inch mount) and Stellarvue 115mm refractor. So clearance with the pier could be an issue if I have anything bigger than a 6" concrete pier. So I was thinking...

Could I make hybrid concrete pier + the pier section of my Stellarvue TSL5 tripod. The TSL5 pier section is around 26" tall and has 3 evenly spaced 3/8-16 holes and one centered 3/8-16 hole. I thought I could mount the TSL5 pier (removing the legs) to a leveling plate solution (like Dan's plates) atop a shorter concrete pier of maybe 8" or 12" inches in diameter.

Anyone think this would be work well for visual viewing?

Feedback is really appreciated - and if you have done something vaguely similar - a picture would be awesome.

Thanks,
Myles

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#2 Myles

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Posted 01 May 2011 - 05:29 PM

Here is the bottom of the TSL5 pier section - four 3/8-16 holes.

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#3 Doug76

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Posted 01 May 2011 - 08:58 PM

Well, I did something similar with my observatory pier.
I balked at spending the high dollars on a pier plate to mount my Atlas, so I used the Atlas extension Orion sells instead. It's not as long as the extension you will use, and I replaced the steel tube with a like sized aluminum tube, but it worked out fine.

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#4 Doug76

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Posted 01 May 2011 - 09:02 PM

I shortened the extension some time later.

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#5 SkipW

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Posted 01 May 2011 - 09:09 PM

Offhand, I would say probably not well. The tripod legs, spreaders and pier form a pretty substantial triangle which gives the pier lateral stability. I doubt attaching it at the base only would be very steady, and it may not be strong enough to support much lateral load at all.

Not the question you asked, and only my opinion, but if you're going to the trouble and expense of building an observatory with a permanent pier, you'd be better off with an equatorial mount. If it's to save up-front cost, I'd say wait until you can get a more suitable mount.

#6 Doug76

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Posted 01 May 2011 - 10:20 PM

From his picture, it looks like there could be three attachment points, where the spreader attaches. It could be enough. Depends on the weight of his rig.

#7 Myles

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Posted 01 May 2011 - 11:39 PM

Thanks for the input and replies everyone. CN is always the place to go for how-to astro information.

I think I have made the question moot as I took a closer look at my rig, an 11 lb 115mm refractor, and see that there is actually 4.3 inches of clearance from the center of the DiscMount-4 outward - hence my scope/mount will work on a 8" pier. So, that is my new plan, an 8" concrete pier , mounting plates, and the DM-4.

Thanks again.
Myles

#8 Doug76

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Posted 02 May 2011 - 01:32 AM

An 8" will do. It is the size of my concrete pier.






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