Re: [ATM] Venting Holes in a solid OTA

["Jack Swaton @ Starry Host" <jswaton@starryhost.com>]

Very interesting on the shaper bits. It's out in my case since those bits
need 1/4" wood but perhaps on a future project!

I just finished watching a "Wallace and Grommit" (Were Rabbit) with my
daughter. There is one English Rube Goldberg.

~Jack

-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf Of
Michael Wheatley
Sent: Sunday, October 08, 2006 5:16 PM
To: atm@atmlist.net
Subject: Re: [ATM] Venting Holes in a solid OTA


Another way to do boards for an optical tube would be with a router 
or shaper and radius bits called "Large Diameter Flute and 
Bead"  "Canoe" or "Bead and Cove" bits.  Just cut once and any 
variation will be in the diameter of the tube.  No need to adjust angles.

Regarding fans, Rube Goldberg would not be impressed with all this 
fuss about where to mount a single fan when there is an excuse for 
two fans and an air filter.  You want clean air flowing both down the 
tube over the mirror and out the top of the tube so mount a larger 
filtered supply fan with a diffuser in the side of the tube and a 
smaller exhaust fan behind the mirror.  A rubber diaphragm would make 
a good fan mount.

I believe England has a Rube Goldberg counterpart and everyone in 
Australia and New Zealand is proud of their gadgets.

Mike Wheatley

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