[TheForge] In a pickle now!

Mon Jul 21 16:55:00 2003

I think you went the wrong way in your dimensioning. The brass should be
.002" LARGER than the steel for a press fit. If the brass is smaller than
the steel, there is no way to get the steel into the brass (Except of coarse
for the short distance you were able to deform your two pieces).
Darrell

http://www.machinemaster.com
----- Original Message -----
From: "WinnonaD" <[email protected]>
To: "Blacksmith's I-Forge" <[email protected]>
Sent: Monday, July 21, 2003 8:23 AM
Subject: [TheForge] In a pickle now!

> 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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