[sac-forum] Re: M48 thread load question

  • From: Greg Schwimer <schwim@xxxxxxxxxxx>
  • To: sac-forum@xxxxxxxxxxxxx
  • Date: Tue, 17 Nov 2015 17:18:45 -0700 (MST)

Ah, good point about the cold. Maybe an approach to ensuring tightness would be
to assemble warm and use the cold as an advantage.

The imaging camera will be on a diagonal mirror assembly so it will be
unbalanced around the optical axis. I will test this all out at home so as to
not have to work bugs out in the field.



----- Original Message -----
From: "Michael Collins" <cal_donley@xxxxxxx>
To: sac-forum@xxxxxxxxxxxxx
Sent: Tuesday, November 17, 2015 5:01:10 PM
Subject: [sac-forum] Re: M48 thread load question

On 11/17/15 16:45, Greg Schwimer wrote:

Good point about securing things. I can imagine a twisting load against the
threads at certain angles that could cause the load to shift, whether
nosepiece in the draw tube or even an "unscrewing" of the threads. Would this
just be a "make it all real tight and hope that's enough" or should I
consider a more positive means of locking things down, whatever that might
look like.

Unless the load is highly unbalanced around the optical axis you
shouldn't have to worry too much about static torque causing anything to
loosen. You will want to be sure the threaded components are firmly
tightened, but don't get carried away. Again, if you set up at home you
can probably get a a good idea as to what will work in the field. One
thing to consider is that the threads will naturally tighten a bit as
the aluminum gets colder and contracts. You may have a hard time trying
to unscrew things at the end of the night, so be prepared to simply cap
the nose piece and disassemble the following day after everything is
back to room temperature.
--
cal_donley@xxxxxxx


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