On Topic: power control

From: Shawn T. Rutledge <ecloud_at_bigfoot.com>
Date: Tue Jun 26 17:53:47 2001

On Tue, Jun 26, 2001 at 06:25:23PM -0400, Vance Dereksen wrote:
> On Tue, 26 Jun 2001, Mike Ford wrote:
> > Are these going to go "whoosh"?
> Absolutely. I am setting up miniature speakers in the door frames. I am
> serious.

I'm building an automatic door too. It would be easier to use a screw
drive but I thought the "whoosh" would be completely natural if it were
driven by an air cylinder instead. The main problem is I need to find
electric air valves to control which end of the cylinder gets the air.
Any ideas where to look?

I plan to use a barn door slide that I had extra to hang the door
(rectangular track about 2 x 3 inches cross-section, with wheeled "trucks"
that ride in the track from which you hang the door), but it will make some
noise too. With a motor screw drive, it might end up sounding more like
the "cargo bay" doors. That might be OK, and the air cylinder thing is
kindof complicated anyway.

I'm not sure how to build one so that you hear only the "whoosh" and no
other sliding/rolling noises. Maybe if the door was light enough, it
could use an air suspension (blow air through holes in the bottom and
sides of the door, against tracks, thus no wheels needed); but mine is
heavy steel, well over 100 pounds I think. There's a picture here


but I've done a bit more cleanup since then.

I also want to run a laser beam along the edge of the door and stop it
if the beam is broken. (This is also easier to do with a screw drive.)

  _______                   Shawn T. Rutledge / KB7PWD  ecloud_at_bigfoot.com
 (_  | |_)          http://www.bigfoot.com/~ecloud  kb7pwd_at_kb7pwd.ampr.org
 __) | | \________________________________________________________________
Received on Tue Jun 26 2001 - 17:53:47 BST

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