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Equipment Discussions >> ATM, Optics and DIY Forum

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tcmzodiac
professor emeritus


Reged: 11/11/11

Re: My curved spider sags...suggestions? new [Re: tcmzodiac]
      #5534299 - 11/22/12 06:18 PM

Update: as some may know, this is a new build and hense, Im just getting to know it. Ive cut "the sag" by about 75% simply by tightening things up....Ive had to learn how tight to set things...was a bit too light on the tightening at first. So..its an f6 10"...at this time the laser spot as viewed against the Cateye style centermark on the primary (ie triangular) wanders aprox 1/8" or a tad less as I move horizon/zenith.
Should I persue this more or am I in an acceptable range at this point?

BTW there is zero movement at the spider atatchment points bracket/ota. So...that is not the issue.

Edited by tcmzodiac (11/22/12 06:22 PM)


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killdabuddha
Pooh-Bah
*****

Reged: 08/26/11

Re: My curved spider sags...suggestions? new [Re: tcmzodiac]
      #5534453 - 11/22/12 08:52 PM

Yer PAE tolerance is 1.08mm, a little less than the 1/8th you still have, but maybe yer there excepting the steepest altitude?

http://www.catseyecollimation.com/Newtonian%20Axial%20Tolerances.pdf

Are you usin lock washers? I bet yer fine, and collimate at 45* Congrats on the easy fix.


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killdabuddha
Pooh-Bah
*****

Reged: 08/26/11

Re: My curved spider sags...suggestions? new [Re: killdabuddha]
      #5534460 - 11/22/12 09:00 PM


Yay Mike. I remember when we came across yers and said, "Drats! Someone else is doin that." But yeah, we saved weight with a different mount, else we woulda had a Spooner. Absolutely no give there.


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Chucky
sage
*****

Reged: 04/16/10

Loc: Dublin, Ohio
Re: My curved spider sags...suggestions? new [Re: killdabuddha]
      #5535034 - 11/23/12 08:48 AM

I followed Clyde's instructions and made my similar professionally made Protostar curved spider work just fine in my 10 inch F6 tube Dob. Check out his spider in this link:
http://www.nmsu.edu/~ucomm/Panorama/summer2001/path.html


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