Mike Coslo wrote:
Dave Heil wrote in
:



Michael Coslo wrote:
Dave Heil wrote:

some snippage

Sorry for the late reply on this, esp since the thread has taken a
different direction, but I though it deserved a reply....


Maybe. Another wire, mounted diagonally from the rear would have done
away with most of the pendulum action. If you're worried about
buildings shaking, even a steel mounted would have such vibrations
transfered to the projector. The wires might have even damped those
types of motion.

Using wires does not work. The reason is that buildings do not shake in
the way most people think. The building may shake in one axis, and not
another, and may shake in multiple directions, but not the same amount in
all axes, or at the same time.

Okay, so what you earlier described as the motor fan causing a pendulum
motion wasn't exactly correct then. What you've described could be
described as random orbital in nature or, at times, even multiple pendula.

This will have the effect of pulling the entire assembly in one direction
or another, depending on "whats a-shakin'", and which wire is pulling
more at the moment.

I'm thinking that if you've got a building doing *that much shaking*,
you've got more problems than a projector moving a bit.

However, on a good sturdy ceiling mount, that has a resonance frequency
as high as practical, building movement is not much of a problem, unless
the building is on the verge of shaking itself apart. The reason is that
rapid pendulum damping with little movement gets rid of pendulum moment,
and that most floors tend to shake closely with the ceiling on any given
level, so the people are moving along with the image and screen.

I'm getting dizzy already, Mike.

I've never seen a professional design with wires, although I've
seen a few designed by others, and they all have damping problems, all
related to the multifilar pendulums they create. Oddly, the wire systems
I've seen were "designed" and built by engineers who thought they could
remove all the filar pendulum movement by going multifilar. That
inherently creates more complexity in movement. The answer is in that the
projector on the end of that pendulum becomes very similar to a mirror
galvanometer, greatly amplifying the movement by the time the light hits
the wall.

This is getting really close to becoming a Cecil moment. :-)

Absolutely! This aesthetic is in no way saying "look at me! I'm
serious art!" I would go a little further to state that some examples
of the genre are downright ridiculous - by design.
...and I'd go even further in saying that most of it is downright
ridiculous by design or otherwise.

There is room in this world for a lot of different tastes. Some I
like, some I do not. I am always careful to not call any of them
ridiculous so that I don't indadvertantly insult someone. 8^)

You must never be so sensitive about what people might think of your
opinion that you become afraid to express it. If you think that a
certain style is kitschy or silly, you're permitted to say so. So am I.

Kitsch is kitsch no matter who tosses the pillows with a flair.

That being said, there are examples of great beauty in there, on
the
workshop page, the telegraph sounder was gorgeous, and the pick guard
on the Stratocaster is beautiful.

I own a perfectly good '73 Strat. I'm defacing it for no one.

I have a hard time agreeing that *that* Strat was defaced. I have a white
on white Strat myself, and am happy to keep it that way, but there are a
lot of places who do custom guitar work or design:

http://www.sparrowguitars.com/
http://www.terrapinguitars.com/
http://www.warmoth.com/

Even Fender:

http://www.fender.com/customshop/home/index.php

Sure. Places which will do nearly anything for a buck abound. Some of
the work is skillfully done, but still ends up looking tacky.

There is actually some of this aesthetic running about in Amateur
radio, even if we don't notice it.

It isn't evident here.

I disagree, respectfully, more below.

snippage

Some kind of plating or paint is needed and it isn't practical to
paint things like the threads of screws. Key's aren't designed to
look as if they're steam powered.

Precious metal plating is not there because it is practical, all
those keys are quite embellished, and can we tell the difference between
a gold plated and a painted one in operation?

No, we can't. That doesn't stop the gold plated one from looking better
to most of us. Gold doesn't oxidize the same as most other metals. It
doesn't need to be polished often. Gold in contacts is used where low
conact resistance is desired. In the old days, keys usually had
appreciable current running through them. With low current, solid state
circuits, a little oxidation on contacts can result in a keying circuit
malfunctioning.

No keys which are currently produced are made to look as if they're
steam powered.

They also have unneeded
shapes, and Mister Begali calls them art.

Some folks think an abstract painting done by a Chimpanzee is art. I
don't agree with them. Begali keys are well made. They're attractive
to some.

I find them to be quite
beautiful, and a magnificent tour de force in mechanical design in the
prosaic function of a telegraph key, but would not try to argue that they
are somehow based on practicality.

Keys got prosaic function? The Begalis, like all other keyer paddles
are designed to do a certain job. They can be as attractive as one can
make them, but if they cannot do the job reasonably well, they fail.

That's pretty much my input on the subject until I have the operating are
designed and built. My shack may not be to everyone's tastes, but
hopefully I'll like it! 8^)

You're the only guy who needs approve.

Dave K8MN