Got the bright idea of using a 1/2" copper pipe union as a bushing and
then realized that I don't have a drill bit the right size. Looks like
it's a tight 11/16, an 18mm, or a slightly loose 23/32. Anybody know
offhand which one is right?
And that tells me that it's a tight 11/16, pretty close to right on
18mm, or a slightly loose 23/32. The question is which one makes a hole
that it actually fits. The nominal diameter of the bit and the diameter
of the hole are not the same.
And I think it's an M--it's whatever Home Despot sells anyway.
And it's going into MDF, not precisely bored steel.
I'm not really looking for somebody to compare measurements, I'm hoping
that someone else who has had the same idea has found out from
experience which bit works.
Wait just a minute. Nobody has even determined if it is a coupling
with a stop or without a stop. That would make a big difference if he
was going to use it as a bearing. If it has a stop he's going to have
to go back to the BORG and buy another one. That could be a
completely different diameter. Then what??
Pipe is specified by OD; the ID is determined by the nominal OD and the wall
Think about it: if OD were "whatever the manufacturer feels like" you wouldn't
be able to use Manufacturer A's fittings with Manufacturer B's pipes. It's
precisely to ensure such interchangeability of pipes and fittings across
brands that the sizes are specified by OD, not by ID.
The specs are for the OD of the pipe. Fittings are sized to match the pipe.
Pipe sizes are specified by nominal diameter. Pipes of any given nominal
diameter in a particular material always have the same actual outside
diameter, although the inside diameter varies depending on the service
schedule. For example, Schedule 80 pipe is heavier-duty than Schedule 40 --
but 2" Sch 80 and 2" Sch 40 have the same OD. Sch 80 has a smaller ID because
it has thicker walls. The material matters too: 3/4" PVC, 3/4" steel, and 3/4"
copper pipes have distinctly different diameters.
Pipe fittings are specified also by nominal diameter. Female fittings of any
given nominal diameter in a particular material always have the same actual
*inside* diameter, because they need to fit on pipes with a specific *outside*
diameter. Male fittings of any given nominal diameter always have the same OD
as the corresponding pipe in the same material.
Threaded fittings of a particular nominal diameter always have exactly the
same actual diameter of the threaded portion, regardless of material.
On Sat, 26 Jun 2010 03:40:58 GMT, email@example.com (Doug Miller)
You are wrong and I am man enough to admit it. Hoses are measured by
I.D. Tubing is measured by O.D.
For example with copper. We have various "Types," L, M, N and there
may be others. For a given size they are all the same O.D. The
different wall thickness will yield a different I.D. but they will all
use the same fittings because their O.D.'s are the same.
Threaded pipe is definitely specified by OD and wall thickness which
in turn specs the ID.
The thread is also determined by the pipe OD.
(Remember schedule 10, 40, 80, 160, etc)
Soldered pipe such as residential water pipe is a whole different
kettle of fish.
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