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How tight can you tighten rings?

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10 replies to this topic

#1 joelin

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Posted 15 February 2020 - 04:41 AM

For rings like this: https://www.bhphotov...uide_scope.html

 

How tight can you tighten them if you're trying to grip a camera lens or a round CMOS camera body...

 

can I tighten them until my fingers can not tighten them anymore without damaging anything?



#2 DLuders

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Posted 15 February 2020 - 06:11 AM

In theory, you could tighten them with your fingers until they start to dent the metal.  A "snug" fit is all that is needed.  if you don't want the threads to loosen, get some red Loctite threadlocker from your local Auto Parts store.   smile.gif 



#3 jaraxx

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Posted 15 February 2020 - 08:07 AM

Be careful.

"One never knows how much enough is before one knows how much too much is."

- Oscar Wilde ( I think)



#4 junomike

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Posted 15 February 2020 - 08:27 AM

I've always wondered about this as well.  If the rings (pinions?) are tight enough to hold the OTA + accessories at Zenith then how can they not "dig in" to the paint/finish of the OTA?

Otherwise It would slide down, no?



#5 mashirts

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Posted 15 February 2020 - 08:32 AM

The tips are Delrin so grip should be good.


Edited by mashirts, 15 February 2020 - 08:33 AM.


#6 Neptune

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Posted 15 February 2020 - 08:35 AM

Seeing that the tips of the screws are more or less point sources. It does not take much in order to get enough friction to hold any item in place. I would think that finger tight would be more than enough. Proceed with caution.


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#7 LDW47

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Posted 15 February 2020 - 09:17 AM

The rule of thumb for years used to be finger tight and then a 1/4 turn to finish, even on mechanical stuff unless you required torquing pressure which you don’t on astronomy equipment of course !


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#8 luxo II

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Posted 16 February 2020 - 04:46 AM

Most of this stuff is aluminium alloy - soft. Finger-tight should suffice - beyond that you risk stripping the threads.

#9 Jon Isaacs

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Posted 18 February 2020 - 11:53 AM

The standard advice:

 

Tighten until it fails,  then back off 1/2 turn.  :)

 

I would not finger tighten them until your fingers cannot tighten them anymore, that could cause damage and it's unnecessary.  I would play it by ear. Tighten them until the lens/camera seems secure and then test it to see if theres image shift. 

 

Jon



#10 ryanr256

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Posted 18 February 2020 - 02:47 PM

8038df238f29016f7d82e86c77a85713.jpg

 

-Bob


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#11 Hondo

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Posted 18 February 2020 - 04:25 PM

if you don't want the threads to loosen, get some red Loctite threadlocker from your local Auto Parts store.   smile.gif

In case you are not aware, red Loctite is permanent and will require heat to remove it.  Purple or blue can be removed without heat.




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