[ATM] Active Dampening

[Jay Kirkland <jaykirk2@compusmart.ab.ca>]

Boy, I hope I've done this right. I've tried to upload 2 pictures of my 
20" f5.7. The truss tubes are only 1 1/4" in diameter, and vibration was 
a real problem. The spider end of the scope doesn't weigh anything, even 
with the completely wooden 2.75" Crayford focuser, and my laser 
collimator showed that flexure wasn't a problem. So I tackled the 
vibration by press fitting a light baffle half-way down the truss. The 
baffle is notched to hold the truss tubes securely and notches are 
positioned to slightly flex the truss tubes outwards. It seems to have 
had the effect of reducing the the effective truss tube length and has 
very much deadened vibration to near zero, altho I haven't had the skies 
or the planets to try the scope out at high power yet. 

http://www.atmlist.net/contrib/jaykirk2@compusmart.ab.ca/20atm1
http://www.atmlist.net/contrib/jaykirk2@compusmart.ab.ca/20atm2

Jay

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