[TheForge] In a pickle now!

Tue Jul 22 09:53:00 2003

The 16" gun barrels on battleships had  liners in them that had to be
replaced after about 2000 rounds were fired.
About every 600 rounds some sailors would use a big hack saw to cut off the
liner that extruded out the end of the barrel.
The barrels were routinely sent back to the Naval Gun Factory at the Wash. D
C Navy yard for refurbishment.
They had a large clear story building with ground level vertical heating
pits in them as long as the barrels. After the old insert was removed from
the heated barrel. A new liner, filled with dry ice, was suspended on a
bridge crane high above the barrel. Using a bomb sight the liner was
precisely positioned above the barrel and then released. The mating ceremony
was quite rapid and dramatic.
The whole facility's long gone now.
The gigantic barrel turning lathes were cut up for scrap after ww II, and
the buildings were demolished about 30 years ago to make room for Govt.
offices.
Chuck
----- Original Message -----
From: <[email protected]>
To: <[email protected]>
Sent: Monday, July 21, 2003 5:57 PM
Subject: Re: [TheForge] In a pickle now!


> 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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