[TheForge] In a pickle now!

[theforge@mailman.qth.net]

Calamity...

Machinerys Handbook (22nd ed) says...

"Allowance for Forced Fits. The allowance per inch of diameter usually ranges from 0.001 inch to 0.0025 inch, 0.0015 being a fair average..................Some lubricant, such as white lead and lard oil mixed to the consistency of paint, should be applied before assembling to reduce the tendency of abrasion."

Good Luck

Bob






>Well, the cannon project has run into a snag.
>
>The barrel is a 660 bronze tube (4" OD 2" ID 24" long)
>The barrel is to be sleeved with a steel tube (1018 2"
>OD 22" long).
>
>A machinist friend (used-to-be-friend?) told me to use
>"0.001 per inch" for a press fit, (but I don't think
>he considered the depth - it has to go in 22")
>
>The steel sleeve measures 2.000", so I reamed the
>bronze to 1.998" with an adjustable hand reamer (a
>considerable job!)
>
>I started running the sleeve into the bore this
>morning with my 6 ton jack and a chain. The sleeve has
>a very slight taper for about the first 1/2" to get it
>aligned and it pressed in fairly easy for the first
>couple of inches and slowly stared to tighten up. I
>drove it a couple of more inches with the sledge
>(first mistake!) before my stubbornness subsided and I
>said to myself "This is too tight!"
>
>Then I tried ta get the sleeve back out by driving it
>with a bar from the other end. It went a ways and kept
>getting tighter. Even heatin the bronze tube with the
>torch wouldn't get it free. (I may have mushroomed the
>end of the sleeve a bit driving it with the bar -
>second mistake!)
>
>In any event, I'm in a pickle now with the sleeve 6"
>into the bronze 'n' tight as he!!
>
>I left a message fer my friend who has a 50 ton shop
>press. When I get a hold of him, I'll see if we can't
>press the sleeve out.
>
>Got a real nice memento now to - a big triangular burn
>on me forearm from the hot bronze (third mistake).
>
>Somehow my enthusiasm fer cannon-buildin's at a low
>ebb right now - $400 worth of material (and a couple
>of weeks work) what ain't together the way it otta be!
>
>So, instead of getting stubborn again, I'll wait and
>see if the press will do the trick - that means
>staying away from temptation by staying out of the
>shop!
>
>Lawrdy I hate MONDAYS!
>
>Calamity (bordering on calamity) Jane
>
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