- Joined
- Sep 24, 2020
- Messages
- 1,923
With a tight chuck, light cuts and slow speed, it is possible.
Been there, done that.
-
Welcome back Guest! Did you know you can mentor other members here at H-M? If not, please check out our Relaunch of Hobby Machinist Mentoring Program!
Internal Threading
- Thread starter rwm
- Start date
Been there, done that.
- Joined
- Aug 22, 2012
- Messages
- 4,131
I know all the accepted wisdom is to use the 29.5/30 degree setting on the compound and when I started I also used that method.
I do understand the reasoning behind that system but since I replaced the compound with a solid plinth I have found that threading at 90 degrees is not a problem.
Admittedly I very rarely thread larger than M2.5 but have made a couple of M4 threads both internal and external.
I do hone the bits and ensure they are very sharp and a mere touch to just flatten the tip. Most materials I thread are stainless predominately with some mild steel and heaps of aluminium.
I do understand the reasoning behind that system but since I replaced the compound with a solid plinth I have found that threading at 90 degrees is not a problem.
Admittedly I very rarely thread larger than M2.5 but have made a couple of M4 threads both internal and external.
I do hone the bits and ensure they are very sharp and a mere touch to just flatten the tip. Most materials I thread are stainless predominately with some mild steel and heaps of aluminium.
- Joined
- Jun 7, 2013
- Messages
- 10,152
I have always threaded the chuck on my 19" lathe hard up, but still have nearly lost the chuck several times when using reverse as a brake; I quickly went back to forward and screwed it back on; a 10" 3 jaw has quite a bit of inertia!
- Joined
- Jun 7, 2013
- Messages
- 10,152
I am told that the Germans have their own method of threading, they position the compound at 90 degrees to the cross slide and feed in with the cross slide just so much, and then feed in axially with the compound a certain amount. BTW, our spell check says that your spelling of (aluminum) is incorrect ---Ha, Ha!
- Joined
- Nov 23, 2014
- Messages
- 2,611
I set the compound to 60.5 deg. on my Grizzly G0709 for internal threading; compound is flipped 180 from what the diagram above shows. One issue for me is the knobs on the compound run into the coolant line and carriage light. Not a big deal to unscrew them and turn the knob by hand.
Bruce
I flip the compound around to the back side and go 1/2 degree past a 30 deg. thread form
Bruce
I flip the compound around to the back side and go 1/2 degree past a 30 deg. thread form
Last edited:
- Joined
- Aug 22, 2012
- Messages
- 4,131
That must be why Americans can't spell.
The correct scientific term over the majority of the planet spells it Aluminium.
Here are some more incorrect spellings you guys get wrong (scroll down)
American and British English spelling differences - Wikipedia
- Joined
- Mar 25, 2013
- Messages
- 4,652
"Davy's spelling aluminum is consistent with the Latin naming of metals, which end in -um, e.g. aurum (gold), argentum (silver), ferrum (iron),[114] naming newly discovered elements by replacing a -a or -ite suffix in the oxide's name with -um: lanthanum was named for its oxide lanthana, magnesium for magnesia, tantalum for tantalite, molybdenum for molybdenite (also known as molybdena), cerium for ceria, and thorium for thoria, respectively. As aluminium's oxide is called alumina, not aluminia, the -ium spelling does not follow this pattern. However, other newly discovered elements of the time had names with a -ium suffix, such as potassium, sodium, calcium, and strontium.
In 1812, British scientist Thomas Young[115] wrote an anonymous review of Davy's book, in which he proposed the name aluminium instead of aluminum, which he felt had a "less classical sound".[116] This name did catch on: while the -um spelling was occasionally used in Britain, the American scientific language used -ium from the start.[117] Most scientists used -ium throughout the world in the 19th century;[118] it still remains the standard in many other Latin-based languages where the name has the same origin.[113] In 1828, American lexicographer Noah Webster used exclusively the aluminum spelling in his American Dictionary of the English Language.[119] In the 1830s, the -um spelling started to gain usage in the United States; by the 1860s, it had become the more common spelling there outside science.[117] In 1892, Hall used the -um spelling in his advertising handbill for his new electrolytic method of producing the metal, despite his constant use of the -ium spelling in all the patents he filed between 1886 and 1903. It was subsequently suggested this was a typo rather than intended.[113] By 1890, both spellings had been common in the U.S. overall, the -ium spelling being slightly more common; by 1895, the situation had reversed; by 1900, aluminum had become twice as common as aluminium; during the following decade, the -um spelling dominated American usage.[120] In 1925, the American Chemical Society adopted this spelling.[120]
The International Union of Pure and Applied Chemistry (IUPAC) adopted aluminium as the standard international name for the element in 1990.[121] In 1993, they recognized aluminum as an acceptable variant;[121] the most recent 2005 edition of the IUPAC nomenclature of inorganic chemistry acknowledges this spelling as well.[122] IUPAC official publications use the -ium spelling as primary but list both where appropriate.[h]"
I think since the Americans invented English we should determine these things?
Robert
Damn- Hijacked my own thread again....
In 1812, British scientist Thomas Young[115] wrote an anonymous review of Davy's book, in which he proposed the name aluminium instead of aluminum, which he felt had a "less classical sound".[116] This name did catch on: while the -um spelling was occasionally used in Britain, the American scientific language used -ium from the start.[117] Most scientists used -ium throughout the world in the 19th century;[118] it still remains the standard in many other Latin-based languages where the name has the same origin.[113] In 1828, American lexicographer Noah Webster used exclusively the aluminum spelling in his American Dictionary of the English Language.[119] In the 1830s, the -um spelling started to gain usage in the United States; by the 1860s, it had become the more common spelling there outside science.[117] In 1892, Hall used the -um spelling in his advertising handbill for his new electrolytic method of producing the metal, despite his constant use of the -ium spelling in all the patents he filed between 1886 and 1903. It was subsequently suggested this was a typo rather than intended.[113] By 1890, both spellings had been common in the U.S. overall, the -ium spelling being slightly more common; by 1895, the situation had reversed; by 1900, aluminum had become twice as common as aluminium; during the following decade, the -um spelling dominated American usage.[120] In 1925, the American Chemical Society adopted this spelling.[120]
The International Union of Pure and Applied Chemistry (IUPAC) adopted aluminium as the standard international name for the element in 1990.[121] In 1993, they recognized aluminum as an acceptable variant;[121] the most recent 2005 edition of the IUPAC nomenclature of inorganic chemistry acknowledges this spelling as well.[122] IUPAC official publications use the -ium spelling as primary but list both where appropriate.[h]"
I think since the Americans invented English we should determine these things?
Robert
Damn- Hijacked my own thread again....
- Joined
- Dec 27, 2014
- Messages
- 4,060
Never miond the spelling, I think you're all making too much of tool position. A good threading tool has no back side. Just set the compound as you would for OD threading and without changing it use a boring bar, reverse rotation (if your chuck is locked) and feed out for internal treads. If you fit the threads to standards, (shop made or otherwise) they'll be fine. The professionals don't switch the compound around for internal threads. I know, I was one for almost 30 years and never even thought about it. I wasn't trained to do it.