Message to David Dillmore...
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David Douglass
David@xxxxxxxxxxxxxxx (main)
Dmdouglass@xxxxxxxxxxxxxxx (Alternate)
Cell (602) 908-9092
On 6/18/18, 10:58 AM, "David" <az-observing-bounce@xxxxxxxxxxxxx on behalf of
ddillmore@xxxxxxx> wrote:
Dear Carl,
I built this little observatory in Tonopah, AZ with a roll-off roof,
estimated weight 2400lbs. It uses an industrial roller and track called
"Unistrut" rated at 3600lb. The track captures the rollers so the wind cannot
lift it off. Inside is an 10-inch Meade SCT on a Celestron CGX mount.
David Dillmore
________________________________
From: az-observing-bounce@xxxxxxxxxxxxx <az-observing-bounce@xxxxxxxxxxxxx>
on behalf of Carl David Wolf <dmarc-noreply@xxxxxxxxxxxxx>
Sent: Monday, June 18, 2018 9:28 AM
To: az-observing@xxxxxxxxxxxxx
Subject: [AZ-Observing] Re: Telescope mounts and the monsoon?
Back at the Cincinnati Astronomical Society the building for the 14in scope
was a shed on rollers so you just opened the doors and rolled the shed out of
the way. They also had a roll roof over the 16in scope. It had supports built
next to the building for the roof to roll out over. Made the weight of the roof
a moot point.
One design I saw on CN which appeared to be workable and quite elegant
utilized industrial grade roller slides similar to what you would find
on a mechanic's tool box or file cabinet. I believe the slides used
offered 60" of travel with a load rating of 1000 pounds. When closed,
the building had no overhang. Two sets could be used on opposite ends of
a building with a split roof to create an opening nearly 10' long, which
is quite enough for almost any amateur class instrument. Were I to
design a building around these slides, I would pay particular attention
to loads when the roof is open, since they would involve significant
forces in tension which are generally a challenge for wood frame
construction where you really want loads in compression.
Of course, the other option is a dome, which also requires no overhang.
Height requirements increase significantly, however, and you're unlikely
to sell the idea to most HOAs inside city limits.
--
<mailto: cal_donley@xxxxxxxxxxxx>
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