tegwin
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| posted on 27/2/07 at 10:35 PM |
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OT Gimball bearing...3 axis?
Long story, but I am trying to make a camera steady for my video camera...
In order to make a half decent job I need to find a bearing/joint of some discription that allows X,Y and Z (forwards-backwards tilt, left and right
tilt and rotation.)
I had origionaly thought that a ball/socket type would be ok, but there is way to much friction...
Is there some kind of bearing that is cheaply available that has the required 3 axis of rotation?
Im trying to build something like this (note the gimbal bearing at the top of the handle)
LINKY
Its kinda similar to a swashplate on a helicopter in many ways...
Chears.
Dunc
[Edited on 27/2/07 by tegwin]
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tegwin
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| posted on 27/2/07 at 10:45 PM |
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Not a bad thought, but I was under the impression that UJ's didnt work too well under compression like that..its more likley to just flop to one
side unlike a ball of some discription isnt it?...
Dunc
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gazza285
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| posted on 27/2/07 at 10:46 PM |
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Why are universal joints so called? Fixed to a swivel of course. You could use a prop with a centre bearing, just remove everything apart from the
bearing and the U/J next to it. Fix the bearing to your fixed mount and fit the camers to the free side of the U/J and you're away.
DO NOT PUT ON KNOB OR BOLLOCKS!
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gazza285
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| posted on 27/2/07 at 10:48 PM |
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Sorry I deleted so I could make myself look smarter.
So you want no friction but some motion damping. Let me have a think.
DO NOT PUT ON KNOB OR BOLLOCKS!
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tegwin
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| posted on 27/2/07 at 10:57 PM |
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Hmm..Its confusing me lol!
I want no friction, but dont need any damping...
The counterweights at the bottom of the rig act as the damper...
You might be right about using a UJ...will have to take a look at one...
There has to be a bearing that does a similar job?
Dunc
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blakep82
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| posted on 27/2/07 at 10:58 PM |
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rose joint used in the...
O
l
position
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gazza285
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| posted on 27/2/07 at 11:01 PM |
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If you have counterweights underneath then why would it flop over?
A ball joint/Rose joint will do the job, but they are made with a degree of preload, once this has worn off then it should be free running. Do not
attempt to use a car based ball joint as these are generally sprung to remove any free play, hence the friction. I'm sure that somebody on here
will be able to furnish you with a free running old Rose joint.
DO NOT PUT ON KNOB OR BOLLOCKS!
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blakep82
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| posted on 27/2/07 at 11:07 PM |
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email this guy
MCGILLMOTORSPORT@aol.com
he sells rose joints to stock car racers in cowdenbeith, as well as other tracks.
he sells the type with teflon lining (friction) but also 2 peice metal to metal rose joints (VERY low friction). a 1/2" diameter hole by
5/8" shaft will cost about £4, go anywhere else and expect to pay about £15
[Edited on 27/2/07 by blakep82]
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tegwin
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| posted on 27/2/07 at 11:09 PM |
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You may be right about the flop in the UJ..
I will have to experiment with my trusy lego set and see what happens...:p
An old rosejoint would be more practical though..
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blakep82
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| posted on 27/2/07 at 11:14 PM |
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McGill Motorsport will get you sorted with a rose joint
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gazza285
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| posted on 27/2/07 at 11:15 PM |
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So you have said...
DO NOT PUT ON KNOB OR BOLLOCKS!
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