Solving the Tight Fitting Annulus Problem at Work

  • Thread starter kieren12345
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In summary, the conversation revolves around a problem at work where a large annulus needs to fit a shaft, but the calculated tonnage required is beyond the workshop facilities. Suggestions are made to cool the shaft with LN2 and heat the outer piece, as well as using the materials to determine the clearance needed for assembly. The idea of heating the outer piece and chilling the inner is suggested, but it is noted that it may not be enough to solve the problem. The use of induction heating to fit sleeves on shafts is also mentioned. Despite attempts to press the shaft into the heated annulus, it ultimately buckles and the problem remains unsolved.
  • #1
kieren12345
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I have a problem at work!

We have a large annulus that we need to fit a shaft into. I have calculated the tonnage required and it is outside of our workshop facilities.

Any ideas, Lub, etc?
 
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  • #2
i would not comment on this post if i had too!
 
  • #3
Its a real tricky problem in my line of work. I am worried about damaging the shaft.
 
  • #4
could the shaft be cooled with LN2 and the outer piece be heated? If you know what the interference fit of the 2 would be, simple expansion contraction formula would tell if its doable

dr
 
  • #5
Heat the outer and chill the inner. That is about all you can do. Like was mentioned, use the materials to find out the CTE of each component and find out the delta T required to give you the clearance required for assembly.
 
  • #6
i guess this is one of those questions you have to be really careful in how you word it.:smile:
 
  • #7
Some of the equipment on the paper-machine had interference-fit sleeves on shafts, and the millwrights fit them by putting the sleeve/collar/etc in a large portable induction heater until it had swelled sufficiently, then quickly pressing it on the shaft. I don't recall them ever cooling the shafts, but the sleeves were plenty hot when they went on.
 
  • #8
Thanks for all the help with this one guys. Yes I see your point with the wording, there are a lot of terms in engineering that can be considered something else if you have a dirty mind. Anyway, I heated the annulus and slowly tried to press the shaft in, however the shaft has buckled on insertion. :(
 
  • #9
too much interference at ambient conditions
or
too big a hammer
sorry it didn't work

dr
 

FAQ: Solving the Tight Fitting Annulus Problem at Work

1. What is the "Tight Fitting Annulus Problem"?

The Tight Fitting Annulus Problem is a mathematical problem that involves finding the optimal way to fit a smaller circular object (the inner annulus) into a larger circular object (the outer annulus) without any overlap.

2. Why is the Tight Fitting Annulus Problem important?

The Tight Fitting Annulus Problem has practical applications in various industries, such as manufacturing and construction, where precise fitting of objects is necessary for efficiency and safety. It also has theoretical significance in the field of geometry and optimization.

3. What are the main challenges in solving the Tight Fitting Annulus Problem?

The main challenges in solving the Tight Fitting Annulus Problem include finding the optimal solution among an infinite number of possible configurations, dealing with irregularly shaped annuli, and accounting for any constraints or limitations.

4. What are some common approaches to solving the Tight Fitting Annulus Problem?

Some common approaches to solving the Tight Fitting Annulus Problem include using geometric and algebraic methods, numerical optimization techniques, and computer algorithms. Each approach has its own advantages and limitations, and the best approach may vary depending on the specific problem and constraints.

5. Are there real-world examples of the Tight Fitting Annulus Problem?

Yes, the Tight Fitting Annulus Problem can be found in various real-world scenarios, such as designing pipe fittings, creating gears for machinery, and constructing bridges or tunnels. It is also a common problem in puzzle and game design, such as fitting different-sized blocks into a larger container.

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