[AT] OT: Cast iron work on a replica cannon

Sat May 4 20:06:50 PDT 2019

Learned something new today! Never heard of a var before, but at least 
now I know what it is (at least in TX). :o)

Phil in TX

On 5/4/2019 9:16 PM, Jim Becker wrote:
> A chain is 66 feet, or 22 yards.  It is made up of 100 links.  There 
> are 10 chains in a furlong, 80 in a mile.  One square chain is 1/10 of 
> an acre.
>
> If you want some real fun, try dealing with a var (actually vara, 
> Spanish for rod) in the parts of the country originally settled by the 
> Spanish.  A Texas var is 33 1/3 inches.  A California var is 33 inches 
> even.
>
> Jim Becker
>
> -----Original Message----- From: Rena Glover Goss
> Sent: Saturday, May 04, 2019 7:58 PM
> To: Antique Tractor Email Discussion Group
> Subject: Re: [AT] OT: Cast iron work on a replica cannon
>
> It has been too long since I did this, Stephen.  I used to teach this 
> material to engineering and engineering technology students, but have 
> been retired for 18 years, and gave all my metric taps, dies, drills, 
> and wrenches to one of my grandsons when I downsized.
>
> I used to get criticized by faculty colleagues because I taught my 
> drafting and graphics courses only in metric units.  I told them the 
> students really didn't know how to use any of the four systems of 
> measurement, and that they would develop a decent sense of at least 
> one of them if they didn't have to be confused by dealing with the 
> others.  I don't think my colleagues necessarily "bought" my argument, 
> but I did find that things were much simpler when students only had to 
> deal with a single measurement device.  I think I still have metric, 
> architectural, mechanical engineering, and civil engineering scales 
> laying around--but not nearly as many of them as I used to.
>
> So tell me-- How long is a surveyor's chain, and what are the units in 
> it? This is not an esoteric question.  Our family is currently dealing 
> with a real estate transfer that dates to the original survey for the 
> Wabash-Erie canal.  The concepts of Range and Township were still 
> reasonably new at that time, and the units of measure corresponded to 
> the most current technology.
>
>
>
> Larry
> ---- Stephen Offiler <soffiler at gmail.com> wrote:
>> Larry:  yes, with metric threads, you find the tap drill simply by
>> subtracting the pitch from the major diameter.  M15 x 1.0 gives a 
>> 14mm tap
>> drill.  Using this formula, you always end up with 77% thread engagement
>> for any thread, any pitch.  I'm not quite following your comment 
>> about the
>> reduction you use.
>>
>> SO
>>
>>
>> On Sat, May 4, 2019 at 12:37 PM Rena Glover Goss <rlgoss at twc.com> wrote:
>>
>> > THAT'S NO FAIR, SPENCER.  You were not supposed to figure out how 
>> simple
>> > those relationships are in the metric system when compared to any 
>> other
>> > system of threading.  I used a reduction by 1.5 millimeters so the 
>> > thread
>> > engagement came closer to 75%, as is used in the SAE system.  There 
>> are > no
>> > charts for pilot drills in the metric system--they simply aren't 
>> needed.
>> >
>> > Larry
>> > ---- Spencer Yost <spencer at rdfarms.com> wrote:
>> > > I’ve been giving this some more thought, and I am actually now a 
>> > > little
>> > more serious about metric if you can tolerate the idea of a metric 
>> bolt > on
>> > a canon.. All you need are:
>> >
>> > 15 mm x 1 threads per millimeter tap.
>> > 14 mm drill for initial boring prior to tapping.
>> > A 15 mm x 1 threads per millimeter bolt at the length you need.
>> >
>> > No special tooling, no  excessive drilling diameters, etc. A single
>> > thread per mm is a course pitch so it meets that requirement.  This 
>> is > all
>> > fairly cheap, straightforward, available from major Internet 
>> retailers > and
>> > probably your local fastener store if you have such a beast. I am > 
>> lucky - I
>> > have three.
>> >
>> >
>> > Anyway you go, best of luck.
>> >
>> > Spencer Yost
>> >
>> > > On May 4, 2019, at 9:58 AM, James Peck <jamesgpeck at hotmail.com> 
>> wrote:
>> > >
>> > > About 10 years ago I was on a flight to Kansas. I can't quite 
>> remember
>> > the sequence of events. I heard large men speaking a language I do not
>> > remember hearing before as I got on the flight. One ended up seated 
>> next > to
>> > me. Turned out they were from Dronningsborg and were going to Agco in
>> > Hesston for a project meeting.
>> > >
>> > > I asked what they were doing about metric fasteners. The Dane 
>> said > > that
>> > they had been all metric until Agco purchased them. They had been > 
>> switched
>> > to mixed metric and SAE.
>> > >
>> > > It may be irrelevant. Agco shut down Dronningsborg and bought into
>> > Laverda. Are the combines made for Agco by Laverda all metric? Why 
>> would
>> > they not be?
>> > >
>> > > https://en.wikipedia.org/wiki/Randers
>> > >
>> > > [Al Jones] Metric is the work of the devil...…..
>> > >
>> > > Helicoils are wonderful.  Very easy to do and they WORK!
>> > >
>> > > My white demonstrator Super A that I have been tinkering off and on
>> > forever had four badly stripped holes in the torque tube. Somebody had
>> > tapped the 5/8" holes out about 7/8 or so and it was BAD. There 
>> wasn't > any
>> > threaded inserts that I could find that would be direct 
>> replacements.  A
>> > machine shop friend of mine was nice enough to make a set of 
>> inserts, > kind
>> > of like the KeenSerts, and install in the torque tube. Once it's > 
>> painted I
>> > don't think you'll be able to tell that anything ever happened to it!
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>
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