[TheForge] bolt thread repair tool

Tue Feb 24 11:50:43 EST 2015

I know of no personal history on a vise repair of this type but very large
power screws for rolling mill have been made for many many years with a
steel screw and a bronze nut.  In my 32 years of industrial experience I
know of NO failure where the bronze nut fail because of fracture of the root
of the thread.  Some of these applications had simple surface lubrication
and a few had hydrostatic pads built into the face of the female thread.
Largest one I worked with was on the plate mill at Alcoa's Davenport works
-- screw could produce 20,000,000 pounds of load and could be moved under
load - 600 horsepower gear drive.  Screw was 36 inches in dia. and the
outside of the nut 60 inches.  In 1989 we replaced all 5 stands of the
continues hot mail and those screws and nuts had been in service for 40
years -- hard service - mill ran 24/6 (Sunday was maintenance).  Very high
impact loads as the slab hits the mill at threading.  New mill used
hydraulic cylinders rather than mechanical screws -- with servo valve
control a 100 times faster for gauge control.

Dave Smucker
Brasstown, NC

-----Original Message-----
From: TheForge [mailto:theforge-bounces at mailman.qth.net] On Behalf Of Peter
Fels & Phoebe Palmer
Sent: Tuesday, February 24, 2015 2:37 AM
To: Blacksmithing List Sponsored by ABANA
Subject: Re: [TheForge] bolt thread repair tool

Out of curiosity..Has anyone rebuilt a post vise screw that way and really
subjected it to prolonged heavy use/abuse?
Wonder how long it'd stand up?

On Feb 23, 2015, at 7:43 PM, Bruce . <freemab222 at gmail.com> wrote:

There's an article on our website about rebuilding a leg vise, including the
box with brazed-in threads:
http://njba.abana-chapter.com/  click on "Tim Suter's leg vise rebuilding
<http://njba.abana-chapter.com/timvise.htm>" at the left.

Bruce
NJ

On Mon, Feb 23, 2015 at 8:41 PM, Peter Fels & Phoebe Palmer <
artgawk at thegrid.net> wrote:

> I've faked acme style square threads by eyeball and hand ( chisel, 
> hacksaw and files) and the product was really crude. It sorta worked 
> but nothing to be proud of. Someone with a better eye and hand could have
done lots better.
> 
> On Feb 23, 2015, at 4:32 PM, jerry Frost <akfrosty at mtaonline.net> wrote:
> 
> That's true Pete, it wasn't till after the Civil War standardization 
> started becoming the norm. well . . . IIRC. I can see it now, a 
> treadle lathe and hand feeding the cutter using a tracer or similar. 
> Heck if the lathe had a feed screw it could've been hand made too.
> 
> It's starting to sound like doing the repair like one of the older books.
> Wrap the screw with sq stock that's been forged to fit in the relief. 
> Then wrap this piece around a turned bar and forge braze the two together.
> 
> Hand filing is apprentice work. for 1/4" width cut a strip of paper, 
> hide, etc. 1/4" wide and wrap it helically around the shaft and scribe 
> in the gap.
> Then using dividers scribe the width and put the apprentice to work.
> 
> Dies aren't terribly difficult to make by hand but I don't know about 
> a feed screw die. I'm thinking the bits would have to advance 
> incrementally or a person would have to have a heck of a piece of 
> machinery to turn it. Taps would be similar though a LOT easier to 
> make.
> 
> Hmmmm.
> 
> Oh, this is a seasonal thing I've been doing for a while now. Usually 
> we're still getting single digit or sub zero lows and everybody is 
> Jonesing for spring and after getting a little friendly grief about 
> being Frosty at work one day I changed my handle to Toasty. It's a 
> little wish for an early breakup, not that it's necessary here this 
> winter but seeing as how the lower 48 is getting a winter butt kicking 
> I'm making the change for you guys.
> 
> Toasty
> -----Original Message-----
> From: TheForge [mailto:theforge-bounces at mailman.qth.net] On Behalf Of 
> Peter Fels & Phoebe Palmer
> Sent: Monday, February 23, 2015 12:09 PM
> To: Blacksmithing List Sponsored by ABANA
> Subject: Re: [TheForge] bolt thread repair tool
> 
> Jerry, on the couple of screwed up  post vise vice pivot bolts i've 
> rescued, they were neither standard thread nor diameter.
> I'm a guy who picks up bolts and nuts where ever i saw them abandoned 
> for around 50 years, and my misc bolt collection is pretty extensive, 
> but after hours of rooting around in my boxes, buckets and bins.no
matches.
> Gotta suspect they made their own thread taps and dies pretty commonly 
> back then.
> Somewhere in my collection are some very crude, hand made thread dies.
> 
> 
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