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

Sun May 5 04:20:45 PDT 2019

GREAT question, Spencer.  There are some truly oddball taps and dies
readily available, although HomeDepot does surprise me.  I use MSC for
most  tooling, and the sheer number of choices in taps (and dies, I guess,
although I purchase few dies) is mind-boggling.

Here's an example.  In metric, M8 is quite common - as common as 5/16-18 in
the inch system.  The metric fastener system does have a concept of coarse
and fine, but it skews heavily to the coarse.  M8 x 1.25 is about as common
as metric dirt.  Now, check this out:  In just the spiral-flute style, MSC
lists five sizes, including:  M8 x 0.5, M8 x 0.75, M8 x 1.0, M8 x 1.25, and
M8 x 1.5.  And the number of choices!  I kid you not, there are 429
different choices in the M8 x 1.25 size alone, spiral flute alone.  We
haven't even looked at straight flute nor spiral point styles.  Different
materials (HSS, cobalt, vanadium, carbide) with or without a variety of
different coatings, and with different classes of fit (for example, a
series of oversize increments are readily available that make threads to be
plated later).

SO

On Sun, May 5, 2019 at 12:45 AM Spencer Yost <spencer at rdfarms.com> wrote:

> 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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