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motor advice for rotating crt setup

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Ed_McCarron:
The mechanics to get the linear motion of a cylinder to translate to rotary get tricky.  You can never make it that last few degrees without some wierd cam setup - the rotary shaft gets in the way of the cylinder shaft.

If you were to go pneumatic, you'd choose a rotary actuator - but things are getting way over complicated here.

Neverending Project:
Hmm... my witty reply didn't seem to get posted. Probably a good thing, since I am sure it was more witty in my head than in the post.

Anyway, you are right. Converting the linear motion to rotational won't really be practical without putting the pistons in front of or behind the monitor. Which will either be very unsightly, or impossible. (Even if one ignores Newton's laws for a moment to assume that one piston could push another).  :-[

Back to Professor Peabody...

bfauska:
Linear motion to 90degrees of rotary motion is not difficult at all.  Start to creep up on 180 and you have some problems and the need for levers and the like.

I'm not necessarily advocating it, but it's not as hard as some would expect.  See the drawing below.

Ed_McCarron:

--- Quote from: bfauska on October 10, 2007, 04:26:13 pm ---Linear motion to 90degrees of rotary motion is not difficult at all.  Start to creep up on 180 and you have some problems and the need for levers and the like.

I'm not necessarily advocating it, but it's not as hard as some would expect.  See the drawing below.

--- End quote ---

I've done this, realworld, engineering high flow valves for robotic applications.  Use a small cylinder to turn a 90 degree ball valve.

They always tend to stick at one extreme or the other.  My throws are relatively small compared to your drawing.  On the order of 2-3 inches.

YMMV.

DaOld Man:
Of course, you could also use the rack and pinion method. You could rotate the screen several turns, if you had the room for a long enough rack and cylinder.

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