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Orpington Astronomical Society

Astronomy => Technical => Topic started by: RobertM on Feb 16, 2011, 20:08:26

Title: Wanted - Vernier Calipers for a couple of days
Post by: RobertM on Feb 16, 2011, 20:08:26
Has anyone got one of these that I could borrow for a day or two.

Thanks
Robert
Title: Re: Wanted - Vernier Calipers for a couple of days
Post by: Fay on Feb 16, 2011, 22:03:35
 :o
Title: Re: Wanted - Vernier Calipers for a couple of days
Post by: Mac on Feb 16, 2011, 23:00:39
Nope but i've got a micrometer if thats any help.
Title: Re: Wanted - Vernier Calipers for a couple of days
Post by: Ian on Feb 16, 2011, 23:03:02
I have both if you can wait until next Thursday?
Title: Re: Wanted - Vernier Calipers for a couple of days
Post by: RobertM on Feb 17, 2011, 09:18:43
Thanks Guys.

I need the calipers to recenter the C11 secondary; unfortunately it moved when I put the hyperstar on a little too tightly.  I don't know why they can't make those assemblies self centering but any road I'll be more careful in future.

Next Thursday should be fine Ian.

Robert

Title: Re: Wanted - Vernier Calipers for a couple of days
Post by: MarkS on Feb 17, 2011, 10:34:57

How accurately does it need to be centred?

Mark
Title: Re: Wanted - Vernier Calipers for a couple of days
Post by: RobertM on Feb 24, 2011, 13:21:30
I don't know but I aim to do it as accurately as possible.  First re-center the secondary assembly in the corrector then check the corrector in the housing.  When I use the Hotech collimator the secondary housing looks well off but that may be a result of a couple of things still to be investigated.  I'll also check that the baffle tube is square while the corrector is out by measuring distances to the OTA.

I dont expect that anything other than the secondary housing needs adjustment but I might as well check the other bits for peace of mind.

Robert
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