Hi everyone!
I’m trying to make a moving sculpture, it’s made of essentially two equal
size circles about 100/150mm diameter stacked on each other with some
simple geometric patterns cut out.
The end goal is to be able to spin once circle clockwise, and the other
circle counter-clockwise. I would like to think of a way to achieve this by
only using one motor.
The only way I can think of is along the lines of this comedy
hack: https://www.youtube.com/watch?v=Kcs-5DSvSIM (1.02m - the inverted
rubber bandpass filter!)
But I have no idea how to go about engineering this with a motor and no
rubber band! Is there anyone that could possibly share their insight
please? Or should I just use two motors?
Cheers,
Rich
The rubber band, or perhaps something more durable, seems like a
pretty good idea actually, depending on how much load you need to
drive. I’ve seen turntables with a rubber loop between the motor and
turntable.
You could laser cut or 3d print yourself some gears too, that could
work. The MCAD lib for openscad has some decent gear generation code,
I used it for my robot.
Will.On 7 December 2014 at 16:00, rich op richop88@gmail.com wrote:
Hi everyone!
I’m trying to make a moving sculpture, it’s made of essentially two equal
size circles about 100/150mm diameter stacked on each other with some simple
geometric patterns cut out.
The end goal is to be able to spin once circle clockwise, and the other
circle counter-clockwise. I would like to think of a way to achieve this by
only using one motor.
The only way I can think of is along the lines of this comedy hack:
https://www.youtube.com/watch?v=Kcs-5DSvSIM (1.02m - the inverted rubber
bandpass filter!)
But I have no idea how to go about engineering this with a motor and no
rubber band! Is there anyone that could possibly share their insight please?
Or should I just use two motors?
Cheers,
Rich
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Right so I’ve found coaxial gears and think this is the solution to the
problem: https://www.youtube.com/watch?v=xda1WgL9fd0
Would love to get those three gears 3d printed!
Lego gears are cheap and easy, would be good for that :)On Sunday, 7 December 2014 18:48:58 UTC, rich op wrote:
Right so I’ve found coaxial gears and think this is the solution to the
problem: https://www.youtube.com/watch?v=xda1WgL9fd0
Would love to get those three gears 3d printed!
Do you have to drive them from the centre? You could just have the centres on bearings and have a drive wheel near the edge, between the discs, so that one drives forwards and the other backwards.Date: Sun, 7 Dec 2014 16:34:39 +0000
Subject: Re: [HACMan] Back and fourth at the same time! Engineers please help!
From: richop88@gmail.com
To: hacman@googlegroups.com
The loads probably won’t be a great deal at all, I plan to make the circles of out of 3.2mm mdf, I’ve attached the shapes below, it’s hopefully going to turn out like a a type of moving spirograph and create some crazy visual illusions or just some pretty geometric patters.
I wonder if I could make the actual circles into gears themselves? Here’s the thing I basically ripping off: https://www.youtube.com/watch?v=_lyufU1LIOI
The rubber band, or perhaps something more durable, seems like a
pretty good idea actually, depending on how much load you need to
drive. I’ve seen turntables with a rubber loop between the motor and
turntable.
You could laser cut or 3d print yourself some gears too, that could
work. The MCAD lib for openscad has some decent gear generation code,
I used it for my robot.
Will.