[TheForge] stubborn rivets

[newenglandforge at aol.com]

My company makes steel mill rolls and often there is a steel "labyrinth ring" that is "shrunk fit" onto the roll necks by heating it and quickly sliding it over the necks of the rolls.  As it cools, it shrinks tight to the roll and lasts until the roll is worn out making steel strip in the mill.  Every now and then the operator does not get the ring on the roll neck fast enough or puts it on crooked and we need to take it off.  We cut it, chisel it, and grind off the balance - not a clue how you would do it otherwise (and we do it for a living).
Good luck
Mike Schermerhorn



-----Original Message-----
From: Mike Spencer <mspencer at tallships.ca>
To: theforge <theforge at mailman.qth.net>
Sent: Wed, Aug 10, 2016 3:27 pm
Subject: Re: [TheForge] stubborn rivets


Bruce wrote:

> Okay, guys, it's time for one of Einstein's "thought experiments":

The Enlightenment led us to realize that thought, unsupported by
observation, is much overrated.  :-)

> Take a steel plate, maybe 1/2" x 3"x3".  SCRIBE a 1/2" circle in the
> center of the flat so the circle will survive a little abuse.  Heat
> the plate to below red.  Quickly measure the diameter of the circle.

More relevant to Terry's original post:

   Take a steel plate, maybe 1/2" thick but infinite in extent.  DRILL
   a 1/2" HOLE all the way through somewhere. Heat the plate TO RED
   only within, say, 3/4" of the hole.  Measure the diameter of the
   hole.  Allow to cool.  Measure the diameter of the hole.

Dave Smucker's post points in the right direction, same principle as
straightening, say, a 20' piece of 4" diameter rod by spot-heating on
the outside of the bend.

> Does anyone think that the circle will have got smaller?  If so, please
> justify your conclusion (or share whatever you've been smoking).

Peretti's Park Square Mixture.  You're close enough, aren't you, to
drive in to Park Square and get some from Peretti's yourself?   Doesn't
have any pronounced psychocative effects but it's a good Latakia
smoke.  Try Pride of Loch Lomond mixture if Park Square is too bland
for you.


- Mike

-- 
Michael Spencer                  Nova Scotia, Canada       .~. 
                                                      /V\ 
My electric toaster is 103 years old!                     /( )\
http://home.tallships.ca/mspencer/                        ^^-^^

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