Reply by Viktor

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Posted on Adjustable Stool Design

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466 posts in 3654 days

#1 posted 07-07-2010 09:23 PM

I don’t think shrinking/swelling will be a problem.

First of all those post and sleeve are relatively thin and possible lateral movement will be small (1/32” max).

Second, with wood expansion the inner dimension of the sleeve would increase (!), but only (!) if wall thickness < inner sleeve opening.
This happens because not only the walls become thicker, but the expansion also occurs along the perimeter, compensating for wall thickening. (Similar thing happens to pipes when they get hot).
However, the inner post would still expand more than the sleeve opening. But again, this difference will be small and OK for chair operation. I would be more concerned with wobble due to eventual wear. You could design another stop mechanism where the post would be somehow wedged in addition to being pinned.

In case you are curious:
Expansion of the post = increase of the opening, if wall thickness = 0 (or post/sleeve diameter = infinity).

*All above considerations are based on assumption that the wood expands equally in tangential and radial directions.

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