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Aside from pipes and camera cable releases where else are tapered pipe threads used?
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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 |
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MERTON B BAKER
The Uni DB/SLs Can be set up to turn tapered pipe threads with the factory
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threading att., but only if the pitch needed is one that was supplied by Emco. Of course one could make a thread master for any pitch desired. It is also not too difficult to make a treading att. that will cut any thread pitch desired; tapered or not, but one will have to turn the spindle with a hand crank. Mert -----Original Message-----
From: 7x12minilathe@... [mailto:7x12minilathe@...]On Behalf Of ToolRoomTrustee@... Sent: Saturday, November 10, 2012 11:13 PM To: 7x12minilathe@... Subject: [7x12minilathe] Aside from pipes and camera cable releases where else are tapered pipe threads used? 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 |
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With an OD of 5/16" it's 1/16" NPT. Both 1/16" & 1/8" NPT are 27 tpi.
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Straight pipe threads are used for electrical stuff; conduit fittings are threaded NPS as are lamp parts. Roy --- In 7x12minilathe@..., ToolRoomTrustee@... wrote:
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¿ªÔÆÌåÓýOld 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: 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 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 > ><*> To visit your group on the web, go to: > http://groups.yahoo.com/group/7x12minilathe/ > ><*> Your email settings: > Individual Email | Traditional > ><*> To change settings online go to: > http://groups.yahoo.com/group/7x12minilathe/join > (Yahoo! ID required) > ><*> To change settings via email: > 7x12minilathe-digest@... > 7x12minilathe-fullfeatured@... > ><*> To unsubscribe from this group, send an email to: > 7x12minilathe-unsubscribe@... > ><*> Your use of Yahoo! Groups is subject to: > http://docs.yahoo.com/info/terms/ > |
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MERTON B BAKER
The famous Model T Ford had 1/2" pipe threaded sparkplugs. The plumber's
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diestock I have has 2' long handles on it, and is not at al hard to turn. Mert -----Original Message-----
From: 7x12minilathe@... [mailto:7x12minilathe@...]On Behalf Of fd042@... Sent: Sunday, November 11, 2012 10:23 PM To: 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: 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 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 > > > |
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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.)
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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: ? |
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