?

If threaded steel pipe is used for gas, does that make houses safer? I live
in NYC, and a magazine story about the recent hurricane here said that house
fires spread in some neighborhoods because the heat of fires "melted" gas
pipes in the houses. Popular magazines aren't reliable on technical issues,
so I don't know if this was actually true, but if a house fire can get a gas
pipe hot enough to fail from heat, pipes should be made of steel or other
metal with a high melting point.

Mike Taglieri miket_nyc@...

----- Original Message -----
From: "Alan Muller" <alan@...>
To: < 7x12minilathe@...>
Sent: Monday, November 12, 2012 11:41 AM
Subject: RE: [7x12minilathe] Re: Aside from pipes and camera cable releases
where else are tapered pipe threads used?

> Standards for threaded pipe exist up to 24
> inches. The largest I've seen is around 12
> inches but 6-8 isn't uncommon. I have no idea
> how they applied the torque to make these up. Of
> course, modern practice would use a grooved
> system like "Victaulic," or welding. (I have a
> five or six foot pipe tong (chain wrench) that I
> keep around for some reason. I can barely pick it up.)
>
> At one time houses were plumbed with threaded
> galvanized pipe, but those days are long gone, at
> least in the US. Gas pipe is still commonly
> threaded "black" steel but it seems corrugated
> stainless is taking over that
> market. Electricians do some threading of heavy wall conduit.
>
> So it seems that pipe threading is becoming somewhat obsolescent.
>
> I cut and thread pipe a few times a year--usually
> gas pipe or when piping up a boiler. The tools
> are expensive new but easy enough to find at flea
> markets, etc. To do it in the traditional way
> you need a pipe vise of some sort--I like the
> chain type as being less in the way--a pipe
> cutter--a hacksaw works--a reamer--filing works
> in a pinch--and dies/stocks, which come in different sorts.
>
> Threading is a really lousy way to put up
> something like a flagpole, or to contain high
> pressures under vibration, as the threads thin
> the pipe wall and create places for circumferential fatigue cracks to
> start.
>
> At 05:42 AM 11/12/2012 -0500, you wrote:
>>
>>
>>The famous Model T Ford had 1/2" pipe threaded sparkplugs. The plumber's
>>diestock I have has 2' long handles on it, and is not at al hard to turn.
>>
>>Mert
>>
>>-----Original Message-----
>>From:
>>< mailto:7x12minilathe%40yahoogroups.com>7x12minilathe@...
>>[ mailto:7x12minilathe@...]On Behalf
>>Of < mailto:fd042%40earthlink.net >fd042@...
>>Sent: Sunday, November 11, 2012 10:23 PM
>>To: < mailto:7x12minilathe%40yahoogroups.com > 7x12minilathe@...
>>Subject: Re: [7x12minilathe] Re: Aside from pipes and camera cable
>>releases where else are tapered pipe threads used?
>>
>>Old flywheel style single cylinder gasoline farm engines mostly used 1/2"
>>pipe threaded spark plugs. (Made after the low tention spark-points in the
>>cylinder chamber, & before the high speed air cooled engines that became
>>common after WWII) Tapered threads do not give a seal unless used with
>>pipe
>>dope or Teflon tape. (& other sealing methods I don't know about); Regular
>>threading (no taper) up to a flange & gasket is the modern norm for spark
>>plugs; the threads locate it, the flange & a gasket seals it. (& you can
>>use
>>dope/whatever on the threads to be really sure of a seal if you want.) I
>>am
>>not clear as to your need/use of tapered pipe threading...It is
>>traditional
>>for iron plumbing, cheap; & for installations that are semi-permenant, IE
>>not have to be taken apart for a long time. Pipe thread taps & dies work
>>with a straight pipe, both outside & inside size; IE no previous taper
>>machining is needed. These taps & dies have their own built in taper, &
>>will
>>do the work themselves, albeit W/ a lot of effort, either by hand, or a
>>pipe
>>threading motor; but not a small lathe. Seems to me (here in Maine USA)
>>that
>>these threading procedures are better done by hand, with a die/ or tap, &
>>only useing a lathe manually to mount/locate thease tools to get better
>>accuracy.
>>
>>-----Original Message-----
>> >From: Roy
>> >Sent: Nov 11, 2012 8:38 PM
>> >To:
>> >< mailto:7x12minilathe%40yahoogroups.com > 7x12minilathe@...
>> >Subject: [7x12minilathe] Re: Aside from pipes and camera cable releases
>>where else are tapered pipe threads used?
>> >
>> >With an OD of 5/16" it's 1/16" NPT. Both 1/16" & 1/8" NPT are 27 tpi.
>> >
>> >Straight pipe threads are used for electrical stuff; conduit fittings
>> >are
>>threaded NPS as are lamp parts.
>> >
>> >Roy
>> >
>> >--- In
>> < mailto:7x12minilathe%40yahoogroups.com > 7x12minilathe@...,
>> ToolRoomTrustee@... wrote:
>> >>
>> >>
>> >> Classical meter wheel and four dial counter blocks from KAHLSICO.
>> >>
>> >> In my 28 year working life on National Oceanographic and Atmospheric
>>Research ships as an oceanographic
>> >> technician I often had to deal with the devices that measured amount
>> >> of
>>cable going out (and hopefully coming back!).
>> >>
>> >> The technology of the times late 60s to mid 90s (in my career) used a
>>stainless steel grooved wheel with a nominal circumference of
>> >> one meter that was suspended from a gantry or A-frame to allow working
>>room for instrument packages. The wheel used a cable
>> >> similar to a speedometer cable to connect to a mechanical contrivance
>>with four dials to cover units, tens, 100s and thousands of
>> >> meters. The meter wheel and four dial block used male threads to
>>connect to female threads on end fittings of the connecting cable.
>> >> I was essentialy self taught on the job with my own Unimat at first
>>then later got some end of fiscal year money to buy a Unimat for
>> >> my department. I determined that the threads were 5/16-24 which is a
>>National Extra Fine so got a die and taps through govt supply
>> >> system. Much later found that it was actually a ?x27 pipe thread. The
>>NEF tap did work.
>> >> My conjecture is that the NPT was used so the connections could be put
>>on tight.
>> >>
>> >> Anyway, my query here is if anyone else has some examples of where
>> >> pipe
>>threads are used but not on pipes.
>> >>
>> >> Larry Murray
>> >>
>> >
>> >
>> >
>> >
>> >------------------------------------
>> >
>> >Yahoo! Groups Links
>> >
>> >
>> >
>>
>>
>

Thanks Roy,

I was thinking of putting off my purchase for now, maybe I should
re-think it. They have a few books of interest, I hope that someone
will continue to offer them at a reasonable price.

Sometimes resisting the impulse buying urge means a missed
opportunity. Its hard to know what to do.

While on the subject of impulse buying, BusyBee Tools, which has a
store in Edmonton (cheaper shipping to Yellowknife from there) > > >

--- In 7x12minilathe@..., Robert Schulke <robert.schulke53@> wrote:

I'm looking for plans to make a small, useful steam engine on the
mini-lathe. So far all the plans I've seen are either really small
(1/2 inch bore), or require a larger lathe. One that could be put
together from aluminum plate, pipe, bar, etc. would be great.
Castings would be OK so long as they could be finished on the
mini-lathe/mill. It should be able to produce at least 1 HP, and
ideally 5 for powering a small launch.

Thanks in advance!

Have a look here

Standards for threaded pipe exist up to 24
inches. The largest I've seen is around 12
inches but 6-8 isn't uncommon. I have no idea
how they applied the torque to make these up. Of
course, modern practice would use a grooved
system like "Victaulic," or welding. (I have a
five or six foot pipe tong (chain wrench) that I
keep around for some reason. I can barely pick it up.)

At one time houses were plumbed with threaded
galvanized pipe, but those days are long gone, at
least in the US. Gas pipe is still commonly
threaded "black" steel but it seems corrugated
stainless is taking over that
market. Electricians do some threading of heavy wall conduit.

So it seems that pipe threading is becoming somewhat obsolescent.

I cut and thread pipe a few times a year--usually
gas pipe or when piping up a boiler. The tools
are expensive new but easy enough to find at flea
markets, etc. To do it in the traditional way
you need a pipe vise of some sort--I like the
chain type as being less in the way--a pipe
cutter--a hacksaw works--a reamer--filing works
in a pinch--and dies/stocks, which come in different sorts.

Threading is a really lousy way to put up
something like a flagpole, or to contain high
pressures under vibration, as the threads thin
the pipe wall and create places for circumferential fatigue cracks to
start.

At 05:42 AM 11/12/2012 -0500, you wrote:

The famous Model T Ford had 1/2" pipe threaded sparkplugs. The plumber's
diestock I have has 2' long handles on it, and is not at al hard to turn.

Mert

-----Original Message-----
From:
<mailto:7x12minilathe%40yahoogroups.com>7x12minilathe@...
[mailto:7x12minilathe@...]On Behalf
Of <mailto:fd042%40earthlink.net>fd042@...
Sent: Sunday, November 11, 2012 10:23 PM
To: <mailto:7x12minilathe%40yahoogroups.com>7x12minilathe@...
Subject: Re: [7x12minilathe] Re: Aside from pipes and camera cable
releases where else are tapered pipe threads used?

Old flywheel style single cylinder gasoline farm engines mostly used 1/2"
pipe threaded spark plugs. (Made after the low tention spark-points in the
cylinder chamber, & before the high speed air cooled engines that became
common after WWII) Tapered threads do not give a seal unless used with
pipe
dope or Teflon tape. (& other sealing methods I don't know about); Regular
threading (no taper) up to a flange & gasket is the modern norm for spark
plugs; the threads locate it, the flange & a gasket seals it. (& you can
use
dope/whatever on the threads to be really sure of a seal if you want.) I
am
not clear as to your need/use of tapered pipe threading...It is
traditional
for iron plumbing, cheap; & for installations that are semi-permenant, IE
not have to be taken apart for a long time. Pipe thread taps & dies work
with a straight pipe, both outside & inside size; IE no previous taper
machining is needed. These taps & dies have their own built in taper, &
will
do the work themselves, albeit W/ a lot of effort, either by hand, or a
pipe
threading motor; but not a small lathe. Seems to me (here in Maine USA)
that
these threading procedures are better done by hand, with a die/ or tap, &
only useing a lathe manually to mount/locate thease tools to get better
accuracy.

-----Original Message-----

From: Roy
Sent: Nov 11, 2012 8:38 PM
To:
<mailto:7x12minilathe%40yahoogroups.com>7x12minilathe@...
Subject: [7x12minilathe] Re: Aside from pipes and camera cable releases

where else are tapered pipe threads used?

With an OD of 5/16" it's 1/16" NPT. Both 1/16" & 1/8" NPT are 27 tpi.

Straight pipe threads are used for electrical stuff; conduit fittings
are

threaded NPS as are lamp parts.

Roy

--- In

<mailto:7x12minilathe%40yahoogroups.com>7x12minilathe@...,
ToolRoomTrustee@... wrote:

Classical meter wheel and four dial counter blocks from KAHLSICO.

In my 28 year working life on National Oceanographic and Atmospheric

Research ships as an oceanographic

technician I often had to deal with the devices that measured amount
of

cable going out (and hopefully coming back!).

The technology of the times late 60s to mid 90s (in my career) used a

stainless steel grooved wheel with a nominal circumference of

one meter that was suspended from a gantry or A-frame to allow working

room for instrument packages. The wheel used a cable

similar to a speedometer cable to connect to a mechanical contrivance

with four dials to cover units, tens, 100s and thousands of

meters. The meter wheel and four dial block used male threads to

connect to female threads on end fittings of the connecting cable.

I was essentialy self taught on the job with my own Unimat at first

then later got some end of fiscal year money to buy a Unimat for

my department. I determined that the threads were 5/16-24 which is a

National Extra Fine so got a die and taps through govt supply

system. Much later found that it was actually a ?x27 pipe thread. The

NEF tap did work.

My conjecture is that the NPT was used so the connections could be put

on tight.

Anyway, my query here is if anyone else has some examples of where
pipe

threads are used but not on pipes.

Larry Murray

------------------------------------

Yahoo! Groups Links

Standards for threaded pipe exist up to 24
inches. The largest I've seen is around 12
inches but 6-8 isn't uncommon. I have no idea
how they applied the torque to make these up. Of
course, modern practice would use a grooved
system like "Victaulic," or welding. (I have a
five or six foot pipe tong (chain wrench) that I
keep around for some reason. I can barely pick it up.)

At one time houses were plumbed with threaded
galvanized pipe, but those days are long gone, at
least in the US. Gas pipe is still commonly
threaded "black" steel but it seems corrugated
stainless is taking over that
market. Electricians do some threading of heavy wall conduit.

So it seems that pipe threading is becoming somewhat obsolescent.

I cut and thread pipe a few times a year--usually
gas pipe or when piping up a boiler. The tools
are expensive new but easy enough to find at flea
markets, etc. To do it in the traditional way
you need a pipe vise of some sort--I like the
chain type as being less in the way--a pipe
cutter--a hacksaw works--a reamer--filing works
in a pinch--and dies/stocks, which come in different sorts.

Threading is a really lousy way to put up
something like a flagpole, or to contain high
pressures under vibration, as the threads thin
the pipe wall and create places for circumferential fatigue cracks to
start.

At 05:42 AM 11/12/2012 -0500, you wrote:

The famous Model T Ford had 1/2" pipe threaded sparkplugs. The plumber's
diestock I have has 2' long handles on it, and is not at al hard to turn.

Mert

-----Original Message-----
From:
<mailto:7x12minilathe%40yahoogroups.com>7x12minilathe@...
[mailto:7x12minilathe@...]On Behalf
Of <mailto:fd042%40earthlink.net>fd042@...
Sent: Sunday, November 11, 2012 10:23 PM
To: <mailto:7x12minilathe%40yahoogroups.com>7x12minilathe@...
Subject: Re: [7x12minilathe] Re: Aside from pipes and camera cable
releases where else are tapered pipe threads used?

Old flywheel style single cylinder gasoline farm engines mostly used 1/2"
pipe threaded spark plugs. (Made after the low tention spark-points in the
cylinder chamber, & before the high speed air cooled engines that became
common after WWII) Tapered threads do not give a seal unless used with
pipe
dope or Teflon tape. (& other sealing methods I don't know about); Regular
threading (no taper) up to a flange & gasket is the modern norm for spark
plugs; the threads locate it, the flange & a gasket seals it. (& you can
use
dope/whatever on the threads to be really sure of a seal if you want.) I
am
not clear as to your need/use of tapered pipe threading...It is
traditional
for iron plumbing, cheap; & for installations that are semi-permenant, IE
not have to be taken apart for a long time. Pipe thread taps & dies work
with a straight pipe, both outside & inside size; IE no previous taper
machining is needed. These taps & dies have their own built in taper, &
will
do the work themselves, albeit W/ a lot of effort, either by hand, or a
pipe
threading motor; but not a small lathe. Seems to me (here in Maine USA)
that
these threading procedures are better done by hand, with a die/ or tap, &
only useing a lathe manually to mount/locate thease tools to get better
accuracy.

-----Original Message-----

From: Roy
Sent: Nov 11, 2012 8:38 PM
To:
<mailto:7x12minilathe%40yahoogroups.com>7x12minilathe@...
Subject: [7x12minilathe] Re: Aside from pipes and camera cable releases

where else are tapered pipe threads used?

With an OD of 5/16" it's 1/16" NPT. Both 1/16" & 1/8" NPT are 27 tpi.

Straight pipe threads are used for electrical stuff; conduit fittings
are

threaded NPS as are lamp parts.

Roy

--- In

<mailto:7x12minilathe%40yahoogroups.com>7x12minilathe@...,
ToolRoomTrustee@... wrote:

Classical meter wheel and four dial counter blocks from KAHLSICO.

In my 28 year working life on National Oceanographic and Atmospheric

Research ships as an oceanographic

technician I often had to deal with the devices that measured amount
of

cable going out (and hopefully coming back!).

The technology of the times late 60s to mid 90s (in my career) used a

stainless steel grooved wheel with a nominal circumference of

one meter that was suspended from a gantry or A-frame to allow working

room for instrument packages. The wheel used a cable

similar to a speedometer cable to connect to a mechanical contrivance

with four dials to cover units, tens, 100s and thousands of

meters. The meter wheel and four dial block used male threads to

connect to female threads on end fittings of the connecting cable.

I was essentialy self taught on the job with my own Unimat at first

then later got some end of fiscal year money to buy a Unimat for

my department. I determined that the threads were 5/16-24 which is a

National Extra Fine so got a die and taps through govt supply

system. Much later found that it was actually a ?x27 pipe thread. The

NEF tap did work.

My conjecture is that the NPT was used so the connections could be put

on tight.

Anyway, my query here is if anyone else has some examples of where
pipe

threads are used but not on pipes.

Larry Murray

------------------------------------

Yahoo! Groups Links

I was brousing information on threading capabilities on the 7x SIEG lathes. I was referred to the lathe comparison page on the LMS website at .
I noticed the threading column lists a capability of 28 threads for the LMS HiTorque and 18 threads for all other listed SIEG lathes.
How is this done? Does the 28 threads include the metric threads possible with the addition of a 21 tooth change gear? A 32 tooth change gear? Or are the gears in the drive train of the HiTorque different than the other SIEG lathes? I do understand there is no high/low gear in the HiTorque geer train.
What I'm trying to figure out is , can I increase the threading capability of my MicroMark 7 x 14 to 28 threads by adding 21 and 32 tooth gears as mentioned on
Or am I totaly confused and need another cup of coffee?

Chuck

The advice received here has been very helpful, and brought up a lot
more questions. One of those of interest was on thread cutting, it
looks like it may be a problem with the Taig lathe, while on the
Sherline it seems that the motor comes off and the threads cut by using
a hand wheel which has pros and cons.

Another task I'd like to do is knurling. Sherline has a knurling
attachment of an unfamiliar design, but I have not yet found out what
type of tool is used on the Homier / Craftex. I'm having a little
trouble finding information on a knurling tool.

I like Vince's comment;

If you buy it now and stash it away, you'll make room for it a lot
sooner than first making room and then buying it.

It sounds like advice from someone with experience.

Finally, I'd consider buying a used lathe, but I think that the shipping
costs would make it more expensive and a higher risk investment than
getting a new one from Edmonton.

Ron (in Yellowknife)