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

[Spencer Yost]

You are correct Steve - just had it reversed in my mind (or in my typing, just returned from a long trip and can’t even remember what I did this morning).

So I did spend some time searching ( should have done that first I guess).  You are right - unicorns for sure.   The only reference I could find were plugs and this one bolt, which might work:

https://www.gmpartsdirect.com/oem-parts/gm-steering-wheel-bolt-m15x1-5x29-11610164

Wonder why the taps and dies are so easy to come by if the bolts are so rare.   Heck, Home Depot even has them:

https://www.homedepot.com/p/Drill-America-m15-x-1-5-Carbon-Steel-Hex-Re-Threading-Die-DWTSMH15X1-5/305502698

  And it frequently shows up on charts:

https://www.newmantools.com/tech/threadmf.htm


Maybe it just fell out of favor?


Spencer Yost

> On May 4, 2019, at 1:54 PM, Stephen Offiler <soffiler at gmail.com> wrote:
> 
> Oh, and with apologies for the continued critique Spencer, M15 x 1.0 would be a very fine pitch, not coarse.   For comparison, M14 x 1.5 is the fine pitch and M14 x 2.0 is the coarse pitch.
> 
> SO
> 
> 
>> On Sat, May 4, 2019 at 1:40 PM Stephen Offiler <soffiler at gmail.com> wrote:
>> Spencer:  I still question the 15mm fastener.  I originally checked McMaster-Carr before I ever commented; now, I've double-checked there plus MSC and Grainger.  These are THE three "go-to" industrial suppliers online.  None carry 15mm fasteners.  They go straight from 14mm to 16mm.
>> 
>> SO
>> 
>>> On Sat, May 4, 2019 at 10:47 AM 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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