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In lugnet.animation, Mike Thorn wrote:
> At 05:03 AM 10/6/2003, you wrote:
> > In lugnet.animation, Kevin L. Clague wrote:
> > > In lugnet.animation, Mike Thorn wrote:
> > > > Hello all,
> > > >
> > > > For an animation project I'm starting, a camera tilt and pan unit became
> > > > necessary. Here's half of it, the tilt part. (I haven't designed the pan part
> > > > yet) Forgive me if I'm misposting this; this is my first major MOC post.
> > > >
> > > > Deep links: (forgive me for simply providing URL's. I haven't quite figured out
> > > > the FTX system here yet)
> > > >
> > > > <http://brickshelf.com/gallery/Buachaille/camtilt/aaa_overview.jpg>
> > >
> > > Hi Mike,
> > >
> > > I could not get any of your links to work..... Any hints?
> >
> > They work like a charm to me!?
They work for me now also.
> >
> > Cool use of pneumatics Mike, how is control? Pneumatics tend to "jump"
> > from one
> > position to another that would give a pretty non-smooth camera pan?
>
> Yeah, it does somewhat. One thing that helps is not to pressurize the tank
> all the way. If there isn't much pressure it doesn't "jump" as much and
> helps keep increments small. Another thing that's helpful is not to flip
> the switch all the way - just move it to a point where a tiny little bit of
> air leaks through. I really don't want to tilt the platform more than a
> degree or two, for the best results - it takes a lot of frames to make
> something smooth, more than you would think.
I guess I was curious why you used pneumatics. I would think a
motor/gear/rotation sensor would give you very fine angular resolution and
variable speed. You also would only need to control either the front or the
back, but not both.
By using a motor/rotation sensor, you could have the RCX compute the desired
tilt angle from some kind of camera script that describes certain way points at
specific frame numbers (key frames?) or time.
You could provide a similar mechanism for pan.
>
> It's really not quite the best way to do it, just because control is hard,
> but I'm not sure how else I could do it that would maintain the same
> steadiness and small size (which is an issue).
>
> Once again, a regulated switch with a little more control would be nice.
> And a pressure meter, since John Barnes dissolved his sensor stuff.
Tecno-stuff sells pressure sensors. I just bought one.
>
> > The airtank (yours and the LEGO version);
> > Does it really need an in and out? Would not an in be enough since it
> > would act
> > as out as the preassure in the rest of the system drops?
>
> I think you're right, except for one thing: you would not be able to use
> the system while you're pumping. Air would constantly be pumped IN and
> there would be no way for air to get OUT. With a compressor, for instance,
> this would be impossible to use.
Hmmmm. I'm not sure this is true. The pressure wave that is created by you
pumping will get distributed to both the tank and the platform lift pistons.
>
> And if one used a huge bottle (like a 2-liter soft drink bottle) and
> pressurized it beforehand, there's no reason why you couldn't cap one pipe
> for a one-outlet tank. It would be pretty simple, I think. The antennas
> come in handy for once.
Light Sabres work well too.
>
> ~Mike
Kevin
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Message is in Reply To:
 | | Re: Pneumatic Camera Tilt Unit
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| (...) Yeah, it does somewhat. One thing that helps is not to pressurize the tank all the way. If there isn't much pressure it doesn't "jump" as much and helps keep increments small. Another thing that's helpful is not to flip the switch all the way (...) (21 years ago, 6-Oct-03, to lugnet.animation, lugnet.build, lugnet.technic)
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