[AT] Supposedly why our old tractors are not metric and a fairly simple tutorial

[bradloomis at charter.net]

McMaster is also a great resource for bearing info. All I need is a caliper and their book/website and I have found most all I need. And as mentioned earlier, mostly measured in metric. Weird ones and some metric OEM, Motion always came through for us. 

Brad.

 

From: AT <at-bounces at lists.antique-tractor.com> On Behalf Of Stephen Offiler
Sent: Tuesday, February 25, 2020 5:45 AM
To: Antique Tractor Email Discussion Group <at at lists.antique-tractor.com>
Subject: Re: [AT] Supposedly why our old tractors are not metric and a fairly simple tutorial

 

Speaking of fittings - this probably won't be totally comprehensive, worldwide, but the info contained in this link has been adequate to get me by every time I am confronted by some oddball fitting.  From this link you still need to hit, at the top of the page, "How To Identify And Measure Fittings"

 

https://www.mcmaster.com/standard-metal-pipe-fittings/=cde88b1872814775b41abc201f70a579k71xsig6

 

SO

 

 

On Mon, Feb 24, 2020 at 9:17 PM John Hall <jtchall at nc.rr.com <mailto:jtchall at nc.rr.com> > wrote:

Fun fact. Did you know metric pipe threads are actually in inches? They 
are actually 55 deg threadform (British Whitworth) but the pitch is in 
metric. And the real fun part is that the rest of the planet can't even 
decide how to spec them on drawing/print/blueprint. Different countries  
have different designations for the same thing. Off the top of my head, 
I think there are a combined 7 different ways of designating metric pipe 
threads (taper and straight), as opposed to just 2. Now we won't split 
hairs with short projection, dryseal or other specialty threads--lets 
stick to 99.999% of pipe threads.

FWIW, I have 30 years in a machine shop and have continually used both 
english and metric without an issue. Its the rest of the planet that 
makes a big ordeal out of it, we just grab a print and go with it. 
English, German, Japanese--its all the same--until we have to use 
Translate Google to figure out the notes.

One more fun fact. Next time you need some roller bearings for your old 
tractor and start measuring them only to find they aren't exactly 
english, convert them to metric--you might ought to sit down first.

I won't even get into European conduit threads--I've only had to do them 
twice.

John Hall


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