I picked up a bunch of leftover machining tools from a friend who got them from the estate of an old timer. Some great stuff but I'm looking for help with these. I can see they are for cutting threads but how are they used? Are they part of a bigger ***embly? The shape of them suggests they fit into some kind of holder. Thanks, Pete Posted using the Full Custom H.A.M.B. App!
I have a sneaky feeling they are Witworth threads, used on English cars. They go in die heads for cutting external threads.
Those are thread cutting chasers that go into a Die Head. The Die head had a shank that goes into a holder that is run on a engine or turret lathe. Used to thread round bar stock. That technology is old technology. When CNC lathes and single point thread inserts came along, Die head and chaser technology declined , but Die heads are still run in very high production volume where you set up and run 100,000 parts plus. A "D" style die head is most common for external threads and a "SJ" style is most common for internal threads. Yours a English brand obviously. Geometric Tool was the largest US Die Head and chaser company in New Haven, Connecticut from the early 1900's to about 1985 and then CNC lathes came along and changed threading style tooling forever. Below is a picture of a Die Head with chasers in it. http://www.rhmorris.com/images/Services1.jpg Hope this helps.
Yeah. The little W gives away the heritage a bit. So what would a die head look like? I think there is only one of each size there. They do look like they should fit into some kind of ***embly similar to a lathe chuck or something but I would have expected to find maybe sets of three for an application like that. Posted using the Full Custom H.A.M.B. App!
Pete They are used with a geometric die holder. I used to run a turret lathe many years ago (before CNC) and it was a quick way to thread parts. J. Clear
Typed too slow. Corncob probably answered my next question before I asked it. I am guessing these are of little use to me. Posted using the Full Custom H.A.M.B. App!
Here in SW Oregon a Landis Threading machine was going to be crushed at the s****yard & I got it for free including a large number of the dies and the saving item --- the 1954 Landis handbook and operations manual for the thread cutting machine. I haven't set it up for use yet but it will be great with the 3" wide belt drive and the external oiling system. Luckily it has a single phase 220V motor. It must weigh 1500# and is all cast iron and about 6 ft. long and 3 feet wide probably 4 ft. tall over the chaser. Movin/on
Look alot like the dies for our "tom thumb" machine at work but they are shorter looking,as said before maybe for a machine like a "RIGID" brand pipe threader.
Yeah, in the 60's I ran an old Warner-Swazy turret lathe. Used Geometric thread cutters or rollers for rolled threads. Lots of black oil. worked fine for the day.
You are right, probably not much good to you without the head. But they are good quality tool steel, you could slice off one tooth with an abrasive disc and make a single point threading tool if you where in a bind, or if you had one with the right tooth count you could make a holder and cut the grooves on a homeade pulley for a serpentine belt. I have a whole box of them in various pitches stuck back, and I don't have a head either.
The Jalopy Journal
