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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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cutting (US) pipe taper thread
Is both the male & female threads tapered, or just the male? I cannot
see from the examples I have on hand if it is both or not. Wikipedia seems to indicate both are. I could cut external tapered threads on the lathe (I think,,, never done that yet) but don't know how I'd do internal ones since the lathe has no taper attachment. Relating to the aluminum radiator building--I have to relocate the coolant temperature sensor, which uses a 3/8"-18 pipe thread. It screws into the top of the thermostat housing.... so what I need is a nipple for 1/2" ID hose that screws into the thermostat housing, and then I need to make a "T" fitting that the temp sensor will screw into, along with two 1/2" hose nipples. I had assumed there would be taps & dies for this. I have found many sources for cheap dies (pipe threading kits) but no taps yet, and the dies are "long" because they are for threading pipe.... Is there any 'normal' taps & dies sold for this, at a /relatively/ cheap price? I just need the one 3/8"-18 size, internal & external. |
#2
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cutting (US) pipe taper thread
On 2/9/2012 12:06 AM, DougC wrote:
........ I had assumed there would be taps & dies for this. I have found many sources for cheap dies (pipe threading kits) but no taps yet, and the dies are "long" because they are for threading pipe.... Is there any 'normal' taps & dies sold for this, at a /relatively/ cheap price? I just need the one 3/8"-18 size, internal & external. Well really, it looks like it is easiest & fastest to just order a T-fitting and nipples already made off of McMaster,,, but I am still curious. The methods that I have seen for cutting tapers (or tapered threads) on a normal lathe is to offset the tailstock, and spin the part between centers... but you can't do that if you're cutting internal threads. So that is why I am wondering how to cut internal tapered threads on a manual lathe without a taper attachment, or if it can even be done. |
#3
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cutting (US) pipe taper thread
On Thu, 09 Feb 2012 00:18:21 -0600, DougC wrote:
On 2/9/2012 12:06 AM, DougC wrote: ........ I had assumed there would be taps & dies for this. I have found many sources for cheap dies (pipe threading kits) but no taps yet, and the dies are "long" because they are for threading pipe.... Is there any 'normal' taps & dies sold for this, at a /relatively/ cheap price? I just need the one 3/8"-18 size, internal & external. Well really, it looks like it is easiest & fastest to just order a T-fitting and nipples already made off of McMaster,,, but I am still curious. The methods that I have seen for cutting tapers (or tapered threads) on a normal lathe is to offset the tailstock, and spin the part between centers... but you can't do that if you're cutting internal threads. So that is why I am wondering how to cut internal tapered threads on a manual lathe without a taper attachment, or if it can even be done. You can get taps. -- My liberal friends think I'm a conservative kook. My conservative friends think I'm a liberal kook. Why am I not happy that they have found common ground? Tim Wescott, Communications, Control, Circuits & Software http://www.wescottdesign.com |
#4
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cutting (US) pipe taper thread
"Tim Wescott" wrote in message ... On Thu, 09 Feb 2012 00:18:21 -0600, DougC wrote: On 2/9/2012 12:06 AM, DougC wrote: ........ I had assumed there would be taps & dies for this. I have found many sources for cheap dies (pipe threading kits) but no taps yet, and the dies are "long" because they are for threading pipe.... Is there any 'normal' taps & dies sold for this, at a /relatively/ cheap price? I just need the one 3/8"-18 size, internal & external. Well really, it looks like it is easiest & fastest to just order a T-fitting and nipples already made off of McMaster,,, but I am still curious. The methods that I have seen for cutting tapers (or tapered threads) on a normal lathe is to offset the tailstock, and spin the part between centers... but you can't do that if you're cutting internal threads. So that is why I am wondering how to cut internal tapered threads on a manual lathe without a taper attachment, or if it can even be done. You can get taps. Hand grind a few flutes onto an old pipe plug and use it as a ****ing tap for christ sakes. |
#5
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cutting (US) pipe taper thread
On 2/9/2012 1:39 AM, PrecisionmachinisT wrote:
"Tim wrote in message ... On Thu, 09 Feb 2012 00:18:21 -0600, DougC wrote: On 2/9/2012 12:06 AM, DougC wrote: ........ I had assumed there would be taps& dies for this. I have found many sources for cheap dies (pipe threading kits) but no taps yet, and the dies are "long" because they are for threading pipe.... Is there any 'normal' taps& dies sold for this, at a /relatively/ cheap price? I just need the one 3/8"-18 size, internal& external. Well really, it looks like it is easiest& fastest to just order a T-fitting and nipples already made off of McMaster,,, but I am still curious. The methods that I have seen for cutting tapers (or tapered threads) on a normal lathe is to offset the tailstock, and spin the part between centers... but you can't do that if you're cutting internal threads. So that is why I am wondering how to cut internal tapered threads on a manual lathe without a taper attachment, or if it can even be done. You can get taps. Hand grind a few flutes onto an old pipe plug and use it as a ****ing tap for christ sakes. What old pipe plug? The local hardware stores only carry blumbing fittings in plastic, brass, cast iron and some (?) kind of zinc-plated steel. I'd have had to order something anyway.... It aint an emergency though. |
#6
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cutting (US) pipe taper thread
On Thu, 09 Feb 2012 03:53:21 -0600, DougC
wrote: On 2/9/2012 1:39 AM, PrecisionmachinisT wrote: "Tim wrote in message ... On Thu, 09 Feb 2012 00:18:21 -0600, DougC wrote: On 2/9/2012 12:06 AM, DougC wrote: ........ I had assumed there would be taps& dies for this. I have found many sources for cheap dies (pipe threading kits) but no taps yet, and the dies are "long" because they are for threading pipe.... Is there any 'normal' taps& dies sold for this, at a /relatively/ cheap price? I just need the one 3/8"-18 size, internal& external. Well really, it looks like it is easiest& fastest to just order a T-fitting and nipples already made off of McMaster,,, but I am still curious. The methods that I have seen for cutting tapers (or tapered threads) on a normal lathe is to offset the tailstock, and spin the part between centers... but you can't do that if you're cutting internal threads. So that is why I am wondering how to cut internal tapered threads on a manual lathe without a taper attachment, or if it can even be done. You can get taps. Hand grind a few flutes onto an old pipe plug and use it as a ****ing tap for christ sakes. What old pipe plug? The local hardware stores only carry blumbing fittings in plastic, brass, cast iron and some (?) kind of zinc-plated steel. I'd have had to order something anyway.... It aint an emergency though. I've got tapered pipe taps for a few smaller sizes, 1/4, 1/8. You can buy about any size you'd want, but they get expensive. Try http://www.mcmaster.com/#pipe-taps/=g67ub6 Pete Keillor |
#7
Posted to rec.crafts.metalworking
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cutting (US) pipe taper thread
....
Hand grind a few flutes onto an old pipe plug and use it as a ****ing tap for christ sakes. What old pipe plug? The local hardware stores only carry blumbing fittings in plastic, brass, cast iron and some (?) kind of zinc-plated steel. I'd have had to order something anyway.... It aint an emergency though. Don't think the metal in pipe plugs is good enough. You *could* turn some tool steel between centers and then cut flutes and harden to make a tap. But, I'd just shop eBay for the real thing. Karl |
#8
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cutting (US) pipe taper thread
I have a ****load of pipe taps up to 5 inches NPT.
i On 2012-02-09, PrecisionmachinisT wrote: "Tim Wescott" wrote in message ... On Thu, 09 Feb 2012 00:18:21 -0600, DougC wrote: On 2/9/2012 12:06 AM, DougC wrote: ........ I had assumed there would be taps & dies for this. I have found many sources for cheap dies (pipe threading kits) but no taps yet, and the dies are "long" because they are for threading pipe.... Is there any 'normal' taps & dies sold for this, at a /relatively/ cheap price? I just need the one 3/8"-18 size, internal & external. Well really, it looks like it is easiest & fastest to just order a T-fitting and nipples already made off of McMaster,,, but I am still curious. The methods that I have seen for cutting tapers (or tapered threads) on a normal lathe is to offset the tailstock, and spin the part between centers... but you can't do that if you're cutting internal threads. So that is why I am wondering how to cut internal tapered threads on a manual lathe without a taper attachment, or if it can even be done. You can get taps. Hand grind a few flutes onto an old pipe plug and use it as a ****ing tap for christ sakes. |
#9
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cutting (US) pipe taper thread
On 2/9/2012 8:02 AM, Ignoramus13761 wrote:
I have a ****load of pipe taps up to 5 inches NPT. i On 2012-02-09, om wrote: "Tim wrote in message ... On Thu, 09 Feb 2012 00:18:21 -0600, DougC wrote: On 2/9/2012 12:06 AM, DougC wrote: ........ I had assumed there would be taps& dies for this. I have found many sources for cheap dies (pipe threading kits) but no taps yet, and the dies are "long" because they are for threading pipe.... Is there any 'normal' taps& dies sold for this, at a /relatively/ cheap price? I just need the one 3/8"-18 size, internal& external. Well really, it looks like it is easiest& fastest to just order a T-fitting and nipples already made off of McMaster,,, but I am still curious. The methods that I have seen for cutting tapers (or tapered threads) on a normal lathe is to offset the tailstock, and spin the part between centers... but you can't do that if you're cutting internal threads. So that is why I am wondering how to cut internal tapered threads on a manual lathe without a taper attachment, or if it can even be done. You can get taps. Hand grind a few flutes onto an old pipe plug and use it as a ****ing tap for christ sakes. Ig, how do we get a look at your goods? Are they priced anywhere? I would like to find several things. I work for a school district, so bargains are always appreciated. We could use a drill chuck mounted on MT2 to be used on a wood lathe and a 3 or 4 jaw chuck that could mount to 1"x8 RH. I keep hoping to come across a tapping head to mount on a drill press. -- ___________________________________ Keep the whole world singing . . . Dan G remove the seven |
#10
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cutting (US) pipe taper thread
PrecisionmachinisT wrote:
Hand grind a few flutes onto an old pipe plug and use it as a ****ing tap for christ sakes. It's a metalworking question at least. Why all the anger? |
#11
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cutting (US) pipe taper thread
"Jim Stewart" wrote in message ... PrecisionmachinisT wrote: Hand grind a few flutes onto an old pipe plug and use it as a ****ing tap for christ sakes. It's a metalworking question at least. Why all the anger? Its PmT, he must be hormonal again. |
#12
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cutting (US) pipe taper thread
"Jim Stewart" wrote in message ... PrecisionmachinisT wrote: Hand grind a few flutes onto an old pipe plug and use it as a ****ing tap for christ sakes. It's a metalworking question at least. Why all the anger? Anger... LOL |
#13
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cutting (US) pipe taper thread
On 2012-02-09, DougC wrote:
On 2/9/2012 12:06 AM, DougC wrote: ........ I had assumed there would be taps & dies for this. I have found many sources for cheap dies (pipe threading kits) but no taps yet, and the dies are "long" because they are for threading pipe.... Is there any 'normal' taps & dies sold for this, at a /relatively/ cheap price? I just need the one 3/8"-18 size, internal & external. Well really, it looks like it is easiest & fastest to just order a T-fitting and nipples already made off of McMaster,,, but I am still curious. The methods that I have seen for cutting tapers (or tapered threads) on a normal lathe is to offset the tailstock, and spin the part between centers... but you can't do that if you're cutting internal threads. Yes, you can't. And doing an external tapered thread without a taper attachment can also be tricky, depending on the length of the pipe to receive the tapered thread. If it is too long, you can't mount it between centers. And you may not be able to get enough offset in the tailstock to get the right taper, either. (BTW, turning between balls might be easier than between centers for pipe. Make up centers which end in hardened balls. So that is why I am wondering how to cut internal tapered threads on a manual lathe without a taper attachment, or if it can even be done. Yes -- with a tap made for the thread in question. They are made and sold. I have some of various (small) sizes. There are also matching dies. And there are chasers for Geometric die heads to cut tapered threads as well as straight ones, if you happen to have a bed turret for the lathe. Enjoy, DoN. -- Remove oil spill source from e-mail Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#14
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cutting (US) pipe taper thread
On 10 Feb 2012 03:31:31 GMT, "DoN. Nichols"
wrote: And there are chasers for Geometric die heads to cut tapered threads as well as straight ones, if you happen to have a bed turret for the lathe. Enjoy, DoN. A turret may be convenient, but I mount the Geometric head in a boring bar holder on the toolpost. -- Ned Simmons |
#15
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cutting (US) pipe taper thread
On 2012-02-10, Ned Simmons wrote:
On 10 Feb 2012 03:31:31 GMT, "DoN. Nichols" wrote: And there are chasers for Geometric die heads to cut tapered threads as well as straight ones, if you happen to have a bed turret for the lathe. [ ... ] A turret may be convenient, but I mount the Geometric head in a boring bar holder on the toolpost. I've suggested that as a possibility in the past, but never tried it myself, since I *have* the bed turret. :-) Mostly, it requires some tricky centering to get it right. Enjoy, DoN. -- Remove oil spill source from e-mail Email: | Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#16
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cutting (US) pipe taper thread
"DougC" wrote in message ... ... I had assumed there would be taps & dies for this. I have found many sources for cheap dies (pipe threading kits) but no taps yet, and the dies are "long" because they are for threading pipe.... Is there any 'normal' taps & dies sold for this, at a /relatively/ cheap price? I just need the one 3/8"-18 size, internal & external. Where are you, Beverly Hills? Around here every surviving (= well-run) small hardware store carries or can get them: http://www.truevalue.com/product/38-...-Tap/20860.uts http://www.acehardware.com/product/i...ductId=1290739 jsw |
#17
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cutting (US) pipe taper thread
On Feb 8, 11:06*pm, DougC wrote:
Is both the male & female threads tapered, or just the male? I cannot see from the examples I have on hand if it is both or not. Wikipedia seems to indicate both are. I could cut external tapered threads on the lathe (I think,,, never done that yet) but don't know how I'd do internal ones since the lathe has no taper attachment. Relating to the aluminum radiator building--I have to relocate the coolant temperature sensor, which uses a 3/8"-18 pipe thread. It screws into the top of the thermostat housing.... so what I need is a nipple for 1/2" ID hose that screws into the thermostat housing, and then I need to make a "T" fitting that the temp sensor will screw into, along with two 1/2" hose nipples. I had assumed there would be taps & dies for this. I have found many sources for cheap dies (pipe threading kits) but no taps yet, and the dies are "long" because they are for threading pipe.... Is there any 'normal' taps & dies sold for this, at a /relatively/ cheap price? I just need the one 3/8"-18 size, internal & external. Both are tapered, at least the ones I have on hand are. Make sure what you have, there's a straight series as well. A Real Hardware store should have pipe taps at least up to 1/2", a big box home improvement joint, probably not. I've seen button dies for small pipe sizes, The larger ones tend to have separate chasers, just because of the thread length. The local hardwares have all sorts of hose barbs in whatever pipe sizes needed, in brass and for a price, but they ARE available. If you're in the boonies, you may have a time locating parts. NAPA has some hose fittings as well, you just have to decide what exactly you need. Stan |
#18
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cutting (US) pipe taper thread
"Stanley Schaefer" wrote Both are tapered, at least the ones I have on hand are. Make sure what you have, there's a straight series as well. ... Stan Outside of hydraulics I've seen straight pipe-sized threads only on screw-in water heater elements and shower head adapters. jsw |
#19
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cutting (US) pipe taper thread
On 02/09/2012 12:13 PM, Jim Wilkins wrote:
"Stanley wrote Both are tapered, at least the ones I have on hand are. Make sure what you have, there's a straight series as well. ... Stan Outside of hydraulics I've seen straight pipe-sized threads only on screw-in water heater elements and shower head adapters. Electrical conduit & fittings and lamp parts are NPS. -- Bob Nichols AT comcast.net I am "RNichols42" |
#20
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cutting (US) pipe taper thread
On Thu, 09 Feb 2012 19:28:51 -0600, Robert Nichols
wrote: On 02/09/2012 12:13 PM, Jim Wilkins wrote: "Stanley wrote Both are tapered, at least the ones I have on hand are. Make sure what you have, there's a straight series as well. ... Stan Outside of hydraulics I've seen straight pipe-sized threads only on screw-in water heater elements and shower head adapters. Electrical conduit & fittings and lamp parts are NPS. Conduit uses a tapered male thread; female threads on conduit fittings are generally NPS. -- Ned Simmons |
#21
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cutting (US) pipe taper thread
"Ned Simmons" wrote in message ... On Thu, 09 Feb 2012 19:28:51 -0600, Robert Nichols wrote: On 02/09/2012 12:13 PM, Jim Wilkins wrote: "Stanley wrote Both are tapered, at least the ones I have on hand are. Make sure what you have, there's a straight series as well. ... Stan Outside of hydraulics I've seen straight pipe-sized threads only on screw-in water heater elements and shower head adapters. Electrical conduit & fittings and lamp parts are NPS. Conduit uses a tapered male thread; female threads on conduit fittings are generally NPS. Ned Simmons I'm fairly sure I've seen both straight and tapered, depending on if it was indoor or liquid-tight, cast metal or plastic box. The plastic imitation Sealtite that Lowe's sells uses straight male threads and an O ring. I don't have other samples handy to check. I should have qualified my statement with "plumbing" though he's not likely to use an electrical conduit fitting on the radiator. jsw |
#22
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cutting (US) pipe taper thread
Yes, of course the usual pipe taps are tapered.
You will want to use Al parts, because Cu is a major corrosion issue -- maybe galvanized is OK, though. If you bore and straight-thread on the lathe, the final machining is just a quick touchup with the tap. Just look for NPT taps, stands for National Pipe Thread. |
#23
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cutting (US) pipe taper thread
Just look for NPT taps, stands for National Pipe Thread. Just to be clear, pipe thread 1/8 is suitable for pipe of 1/8" internal diameter, about 3/8" external size. |
#24
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cutting (US) pipe taper thread
whit3rd wrote:
.... Just look for NPT taps, stands for National Pipe Thread. Actually, it stands for National Pipe Tapered. And NPS for National Pipe Straight. Bob |
#25
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cutting (US) pipe taper thread
On 2/9/2012 12:52 PM, whit3rd wrote:
Yes, of course the usual pipe taps are tapered. You will want to use Al parts, because Cu is a major corrosion issue -- maybe galvanized is OK, though. If you bore and straight-thread on the lathe, the final machining is just a quick touchup with the tap. Just look for NPT taps, stands for National Pipe Thread. Well I did end up just ordering some aluminum nipples and a "T" fitting from McMaster. The remaining question was how to cut internal tapered threads on a lathe that didn't have a taper attachment. I saw the NPT taps at Enco, $28 for a 3/8"... Enco was offline at that moment... I noticed that the temperature sensor was brass, and it screwed into an aluminum thermostat housing--and there appears to be some brown corrosion in the aluminum thermostat housing threads. I couldn't tell from briefly looking if that was the aluminum corroding or not. I had not seen this connection leak before, so the rust I saw may have been free-floating rust from the iron engine block (this is why I built the magnetic trap in the new radiator tanks). I know that the local hardware store sells brass and steel/zinc plumbing fixtures, but I wanted at least one aluminum nipple to screw into the remaining thermostat housing threads. ...As for the remaining components, I got them in aluminum also since I had to mail-order the one aluminum nipple from McMaster, and the thermostat sensor can be grounded directly off its own body so there will be no current flowing through the brass/aluminum there connection at all. This may not eliminate corrosion in the sensor threads, but should drastically eliminate it. |
#26
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cutting (US) pipe taper thread
"DougC" wrote in message ... The remaining question was how to cut internal tapered threads on a lathe that didn't have a taper attachment. Basically, you don't |
#27
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cutting (US) pipe taper thread
On Thu, 9 Feb 2012 18:56:47 -0800, "PrecisionmachinisT"
wrote: "DougC" wrote in message ... The remaining question was how to cut internal tapered threads on a lathe that didn't have a taper attachment. Basically, you don't Well, you can set the tailstock over to cut *external* threads on an emergency pipe tap. But it won't work if the workpiece is too long. You're limited by how far you can set your tailstock over. -- Ed Huntress |
#28
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cutting (US) pipe taper thread
On Thu, 09 Feb 2012 22:09:40 -0500, Ed Huntress
wrote: On Thu, 9 Feb 2012 18:56:47 -0800, "PrecisionmachinisT" wrote: "DougC" wrote in message ... The remaining question was how to cut internal tapered threads on a lathe that didn't have a taper attachment. Basically, you don't Well, you can set the tailstock over to cut *external* threads on an emergency pipe tap. But it won't work if the workpiece is too long. You're limited by how far you can set your tailstock over. Wait a minute. If you're cutting internal tapered threads, you can set that up with the compound and use the compound feed. Right? -- Ed Huntress |
#29
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cutting (US) pipe taper thread
I'm just too lazy to look it up, but if you have almost any smaller diameter
tap with the same thread pitch, it can be used to cut a tapered thread. The tap is mounted in the toolpost with the cuting edges properly oriented, then bump the toolpost so the tap's free end moves inward slightly. A few trial/error attempts on scrap practice pieces should get the tap angled just enough to match the pipe thread taper. I'd suggest a hand crank on the spindle After pulling the lathe's power cord plug from the receptacle, and using a generous amount of quality cutting lubricant. Set the feed rate to match the thread pitch, and use the off-axis tap as a multi-point boring bar.. feed in with the hand crank for a light cut, back the cross feed in, back up the carriage, adjust for another light cut, engage and turn crank.. repeat until diameter and depth (thread count) are achieved. It's not as easy to get answers to some types of metalworking questions when so many talented and bright metalworkers have stopped participating in RCM as a result of disgust over the rampant, senseless off topic bull****. Yep, RCM is where I learned such tricks, years ago. -- WB .......... "DougC" wrote in message ... The remaining question was how to cut internal tapered threads on a lathe that didn't have a taper attachment. I saw the NPT taps at Enco, $28 for a 3/8"... Enco was offline at that moment... I noticed that the temperature sensor was brass, and it screwed into an aluminum thermostat housing--and there appears to be some brown corrosion in the aluminum thermostat housing threads. I couldn't tell from briefly looking if that was the aluminum corroding or not. I had not seen this connection leak before, so the rust I saw may have been free-floating rust from the iron engine block (this is why I built the magnetic trap in the new radiator tanks). I know that the local hardware store sells brass and steel/zinc plumbing fixtures, but I wanted at least one aluminum nipple to screw into the remaining thermostat housing threads. ...As for the remaining components, I got them in aluminum also since I had to mail-order the one aluminum nipple from McMaster, and the thermostat sensor can be grounded directly off its own body so there will be no current flowing through the brass/aluminum there connection at all. This may not eliminate corrosion in the sensor threads, but should drastically eliminate it. |
#30
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cutting (US) pipe taper thread
DougC wrote:
Is both the male & female threads tapered, or just the male? I cannot see from the examples I have on hand if it is both or not. Wikipedia seems to indicate both are. Both are tapered. At least for NPT. Wes -- "Additionally as a security officer, I carry a gun to protect government officials but my life isn't worth protecting at home in their eyes." Dick Anthony Heller |
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