Re: [ATM] Two questions on collimation bolts

[James P Crombie <jpcrombie@pei.eastlink.ca>]

Alan
  There are a couple of items available to use for this purpose.  One if 
called a T-Nut, the other is called a threaded insert..
Here is a link to the T-nuts
http://www.leevalley.com/hardware/page.aspx?c=1&p=40361&cat=3,41306,41321&ap=1
And Item c on this page is a brass threaded insert that can be screwed 
into a wood base to allow the adjustments on the mirror cell
http://www.leevalley.com/hardware/page.aspx?c=1&p=41023&cat=3,41306,41320
  The T-nuts are mainly designed to be used in a clamping action.  They 
should be used so that the pressure will keep pushing into the part they 
are installed in and should be glued in to prevent them working loose. 
  The brass threaded inserts are a little better but they still have to 
be installed in a wood base. 

 

Alan K. Henderson wrote:

>(Note: cell will have separate sets of bolts for collimation and mirror support.)
>
>1. Are the changes in the tilt of the cell through collimation slight enough that the bolts can be attached rigidly to the cell, or should the connection make some allowance for tilt, similar to (but not as loose as) triangle support connections?
>
>2. Who sells the sort of threading inserts used for the collimation holes in the tailgate? I haven't seen anything of the sort at Ace or Home Depot, other than the wood and plastic variety. (Don't think I want a wooden tailgate.)
>
>
>Alan K. Henderson
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>
>  
>

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