Re: [ATM] Shaping a focuser board to match tube

["Steve Houlihan" <sho11@comcast.net>]

Remember that cutting a cove this way will give you an ellipse, not a
circle.  It may take some hand work to get it round.

Steve
----- Original Message -----
From: "Bob May" <bobmay@nethere.com>
To: <atm@atmlist.net>
Sent: Tuesday, October 25, 2005 11:35 AM
Subject: Re: [ATM] Shaping a focuser board to match tube


> The process described is the correct one.  The only missing part
> is that the width can be seen easily as oyu rotate the guides and
> can be calculated by the simple geometry of the scheme.  Sag
> calculations will give you the width of the cut needed and thus
> the angle needed to do the job.
> Don't forget to make a holder for the piece of wood so that you
> don't get your fingers near the blade.  Pusher sticks tend to be
> a bit flimsy for this work oss make a big holder that will hold
> the piece of wood good and solidly.  Also, don't cut the wood to
> length until after you have the right radius or the short length
> will kick out and be nasty to you.  A longer piece of wood that
> can easily span the whole blade area is better for handling.
> I've done coving to a specified radius and it works well.
> Bob May
> bobmay at nethere.com
> http: slash /nav.to slash bobmay
> http: slash /bobmay dot astronomy.net
> Replace the obvious words with the proper character.
>
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