Klarinet Archive - Posting 000047.txt from 2005/02

From: orm1ondtoby@-----.net (Ormondtoby Montoya)
Subj: Re: [kl] loose barrel rings
Date: Thu, 3 Feb 2005 12:59:13 -0500

Rommel=A0Miller wrote:

> but how does one "shrink" the metal rather
> than crimp it?

Swaging --- which is what the ring machine does --- causes the metal to
flow, not shrink. The total volume of metal is not affected (as you
have said), but the ring's shape changes. One dimension (inside
diameter, in this case) becomes smaller, and some other dimension is
forced to expand.

I used to work in a shop where we slid steel sleeves onto a part and
then swaged them to about 3/4 of their original diameter. The sleeves
served as non-removable clamps (rather than as restraining devices such
as clarinet rings are), but the principle is the same.... the metal
flows into a new shape. Because the dimensions were larger (wall
thickness was swaged from 3/8" down to about 1/4"), the concept of
flowing was visually obvious. The finished sleeves were perhaps 3/8"
longer and noticeably warm to the touch afterwards. There were rules
as to how much and how quickly we could change a sleeve's dimensions.
Too much or too quickly caused some alloys to embrittle and crack.

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