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Is This Mechanically Possible?!

#1 User is offline   Juha 

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Posted 22 May 2008 - 11:16 PM

Is this possible:

http://upload.wikimedia.org/wikipedia/comm...8/Bsgrinder.gif?

#2 User is offline   Wildabeast 

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Posted 22 May 2008 - 11:36 PM

:thumbsup: Yes it is, when I was in High School my buddy had one made of wood. Over at his house we would sometimes mess with it when we were bored. We called it the "Do Nothing" because that's what is does, nothing.... I haven't seen one since then...:flowers:
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#3 User is offline   Juha 

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Posted 23 May 2008 - 08:20 AM

So, in real life you would turn the protruding part anti-clockwise to keep the thing moving?

#4 User is offline   KoanYorel 

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Posted 23 May 2008 - 08:21 AM

Actually, a three cog unit is possible to make also. One just has to carefully plot the angles and the cogs must slide on the rod also.

//Edit: The unit as shown will operate in either direction. Clockwise or counter clockwise.

This post has been edited by KoanYorel: 23 May 2008 - 08:23 AM

The only easy day was yesterday.

...some do, some don't; some will, some won't (WR)

#5 User is offline   DSTM 

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Posted 24 May 2008 - 01:03 AM

Be interesting, to see how one with 3 cogs, would work,Koan. :thumbsup:

This post has been edited by DSTM: 24 May 2008 - 02:36 AM














#6 User is offline   KoanYorel 

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Posted 24 May 2008 - 10:30 AM

*KoanYorel giggles as I saw your first posting before you edited it DSTM.

More than 30 years ago I was taking a mechanical drawing/drafting class.
There was a working model there similar. Except it used wooden balls running in a grooved track.
We were told its designer was trying to build a fluid pump. I don't know if that was truth or fiction.

Our instructor asked us to draw up plans for 3 cog or 4 cog units.
No working models were ever built and we determined that 4 cog units were not possible operating in the same plane.
Only one student solved the 3 cog draft requiring six tracks with an articulated driving arm using balls of course, not the other.
I wish I knew where the guy was now, as I'd have him send you his drawing.
The only easy day was yesterday.

...some do, some don't; some will, some won't (WR)

#7 User is offline   DSTM 

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Posted 24 May 2008 - 10:51 AM

I was hoping you missed my original Post,Chief. I didn't look at it in detail,before commenting. :thumbsup:













#8 User is offline   DOOOMKULTUS 

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Posted 26 May 2008 - 05:57 AM

This seems some sort of trick question.Looks too weired in a gif to judge whether it works.How about a vid.

#9 User is offline   rowal5555 

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  Posted 26 May 2008 - 04:21 PM

Just running it in my head and can't see a problem, LOL.
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  Posted 26 May 2008 - 04:46 PM

:thumbsup: where is the energy coming from to create this motion? and where's it going to? is the output worth the input?
just a thought :flowers:

#11 User is offline   Juha 

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Posted 26 May 2008 - 06:48 PM

I think one has to turn the protruding part in either direction to create the motion. The movement in the picture is probably there just to show how the parts would slide...

As for where the energy is going and whether the output is greater than the input, I think we'll need a physicist!

#12 User is offline   DSTM 

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Posted 27 May 2008 - 12:53 AM

Here is an interesting Site about unworkable Devices. Why don't they work?

http://www.lhup.edu/~dsimanek/museum/unwork.htm













#13 User is offline   KoanYorel 

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Posted 27 May 2008 - 01:09 AM

Nice linking.

Note "our" simple device is not listed. But some others might actually work also.

This post has been edited by KoanYorel: 27 May 2008 - 01:10 AM

The only easy day was yesterday.

...some do, some don't; some will, some won't (WR)

#14 User is offline   david28 

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Posted 27 May 2008 - 01:18 AM

Hmm... it did look like it at first :thumbsup:

#15 User is offline   garmanma 

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Posted 27 May 2008 - 07:18 AM

I remeber building one of those in first year shop class, a long, loooong time ago
Mark
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