The Fits

MolaKule

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In machine design we sometimes need a "zero clearance" fit between machine parts.

Two other names for a zero clearance fit are an ------------ fit and a -------- fit.
 
A pressed fit would considered to be a process by which we obtain a zero clearance fit.

One of the poster's has provided the correct answer.
 
Zero clearance would imply a transition fit, which depending on tolerance may result in a very small clearance fit or a very small interference fit, an interference fit in inherently negative clearance fit.
 
Interference fit or friction fit
That is correct, a zero clearance fit is also called an interference fit and a friction fit.

Let's say we have a hub with an internal bearing race that is supposed to have a very tight fit inside the hub. The outer diameter of the race and the inner diameter of the hub, for our purposes, are the same.

A process by which we can do this, is to bring the race down to a low temp (which contracts its outer diameter) to fit just inside the hubs inner diameter, and then let it expand into the inner diameter of the hub as it warms up.

Of course, if the race's outer diameter is machined to just slightly less than the hubs inner diameter, we may be able to just "pound it in" for a friction fit.

So we were looking for definitions, not how one might execute these fits.
 
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