RE: [ATM] 6-point cell?

["Treur, Harro" <H.Treur@wlb.amsterdam.nl>]

I expect that a Sixpoint cell for a 10 inch (1,6 thick) will be sufficient. 
Several PLOP-experts on the list have calculated my 12,5 inch mirror (2,0
inch thick) and the answer was: 3 point cell!!  Lately I finished this 3
point cell and the first results look very promising.
Advantage of a 3-point cell is that it is easy to built and therefore very
rigid and not too sensitive for building-tolerances.

Good luck
Harro TReur


-----Oorspronkelijk bericht-----
Van: Jan van Gastel [mailto:jhm.vangastel@wanadoo.nl] 
Verzonden: donderdag 10 februari 2005 7:26
Aan: atm@atmlist.net
Onderwerp: Re: [ATM] 6-point cell?


Glueing it to the mounting plate with six blob could possibly make it warp
when the mounting plate warps. But maybe the silicone prevents it from doing
this, I don't know. I wouldn't take the risk.

I have made a nice lightweight design for a six point-three bars cell, for a
10 inch mirror for one of my local atm-club members. If you are
interested...please let me know. It's not that much work. I made one in two
hours for a 12 inch mirror. . Jan
http://home.wanadoo.nl/jhm.vangastel/Astronomy/


----- Original Message ----- 
From: "me" <polaris@gsinet.net>
To: <atm@atmlist.net>
Sent: Thursday, February 10, 2005 1:41 AM
Subject: [ATM] 6-point cell?


Hi,
 I've got a 10" f/6 1.6" thick mirror which I am making a cell for. I am
planning a 6-point cell, using RTV. I am thinking of one of two paths:

1. attach mirror directly to support plate with 6 blobs of RTV.

2. have 3 pivoting bars, each with 2 pads.  RTV the mirror to these pads.
The bars would attach to the plate with swivel joints.


  In either case, I would use edge supports .... either RTV or multiple
points.  The pivoting bar aproach would be more work.  Does it have any
advantage?

  Any opinions on this?

Cheers,
Rob

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