Mechanical engineeree type people....

kindai

kindai

kindai

Sgarrista
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Try to work out how to solve a problem.

Imagine you have a hollow bar of fixed length with a slot cut into one side.

Over this slot, there are 2 moving plates which slide up and down the bar, which must always stay exactly the same distance from the middle as each other, even if more pressure is applied to one than the other.

How would you do it? I was thinking use one of those scissor extension type things with the middle cross over fixed to the back of the bar but wonder how strong those are, and if there is a stronger option available?
 
How big is the bar? Is the slot purely for fixing / sliding the plates or does it need to be accessible between the plates?
 
Is it an open ended slot (ie from the side the bar would look like a c) or a closed slot?

You could maybe think of something like a tie rod if it's open ended.

Need to really know the length, diameter, size/type of slot and method of loading before coming up with anything more definite
 
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My talent knows no bounds.
 
Surely just connect the plates together with a few rods?

Or connect the plates like so with another hollow bar around the main bar --[]==[]--
 
Last edited:
Mynight said:
Yeah wouldn't a straight rod between them be sufficient?
Click to expand...

if they need to maintain the same distance from the centre of the slot with different loads then no.

say left plate is being moved left with 200N the right plate is being moved right with 100N if they were just bared together they would both slide to the far left of the slot with completely different distance to center
 
1 chain, 2 cogs.

Left plate fixed to the chain on the upper side, right the lower side.

So if you push the left one to the left, the chain goes anticlockwise and pulls the right plate to the right.
Flip/reverse.

Have a badass strong bar going in the middle of the plates from the left to the right. They run along this bar.
 
Last edited:
Tefal said:
if they need to maintain the same distance from the centre of the slot with different loads then no.

say left plate is being moved left with 200N the right plate is being moved right with 100N if they were just bared together they would both slide to the far left of the slot with completely different distance to center
Click to expand...

Argh reading comprehension fail :(.

I thought the scissor thing was over engineered to keep two plates equally apart from each other :D.
 
If what your trying to achieve is like a set of jaws that come together in the middle then your drawing is kind of correct with the scissor thing being fixed to the plate in the middle position. It depends how it is being moved forward and back but if the plates sat on a set of linear bearing then this would mostly negate the different loads.

Of course I could have totally miss understood your requirements and in that case ignore me :p
 
Well the scissors thing will work, however I just wonder if there is an alternative, maybe a better option available for doing that?
 
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