Tool Room fit threading on an engine lathe, using quick action tool

[@dutchgray86]

Nice bit of threading, those pull out holders make doing a fade out much easier and speed up single point threading greatly.

[@DonDyarprecision]

It is helping greatly with this older machine, thanks.

[@melgross]

I have a bunch of machinery books from 1865 and newer. I’m often amazed at how sophisticated much of that machinery was, how complex and how large. It’s always fun to see etchings and photos of these really old parts of mechanical evolution. There are a couple of guys who have designed and I think one sells, automatic withdrawing threading holders. It’s interesting they use a strong spring, a cam and an adjustable stop rod attached to the way of the lathe for a positive popping opening. Very interesting.

[@DonDyarprecision]

An automatic threading device could be very useful if you don't cut a lot of threads because I found myself getting out of practice. The hydraulics shops I worked in want screw threads to terminate in less than one turn without a relief groove on the cylinder rods. Not much of the early steam era machine tools survived scrap drives from the world wars. There was still some line shaft driven shops working here in the 1970s servicing farm and ranch needs and modern shops involved with the nuclear and other technology. One machine that has changed very little over time is the tool & cutter grinder.

[@melgross]

@@DonDyarprecision true. One guy who makes these things is on KZbin. His name, and I’m not kidding, is Phinias Whoopee. I may not be spelling it exactly. It pulls back an entire inch. It’s sad that so much of our mechanical history went to scrap over the years.

[@ypaulbrown]

Dear Don, you are keeping me up all night with your videos today..... but my wife loves it as I stay out of her hair.......best wishes my friend Paulie Brown

[@DonDyarprecision]

I get out to the shack when I can't find re-runs of Golden Girls or Matlock, it can happen at any time.

[@swanvalleymachineshop]

Good one Don . 2 levers going opposite directions at once , i would definitely crash ! 👍

[@DonDyarprecision]

It is best to do some practice and work up to speed on that one.

[@jasonhull5712]

Threading on the lathe is fun. Even just watching it done is fun 😊

[@ypaulbrown]

especially when Don is the master behind the controls....

[@DonDyarprecision]

I have found many that will do anything to avoid single point threading. In hydraulic shops it is done everyday. There the fit of the threads is most important on highly stressed cylinders, rods and pistons. In general the nut or cap/glands must spin on without bind and minimal shake or the components will come loose, if too tight will seize and cant get them apart. The threads in Caterpillar practice must not have grooves to terminate threads, both internal and external, instead the thread is faded out in the last turn. There are those that will say the groove for terminating a thread does not weaken the part, however in the most extreme cases "any Bozo with an excavator" Will likely snap a hydraulic rod if it has groove to terminate threads rather than fading the thread out by pulling the tool in the last turn, time for some tea

[@ypaulbrown]

12:20, fantastic information on feeding in on cross slide .0025 to catch the right hand side of thread....... who woulda thunk ?

[@DonDyarprecision]

Setting at 29 1/2 degrees leaves just enough to cleanly shave that right flank and help reduce chatter on hard to cut material like this 01 drill rod.

[@ÁREAJ27]

Olá amigo Don muito bom trabalho como sempre!!! Boa sorte sempre!!!

[@DonDyarprecision]

Thanks!

[@barrycaudle9926]

Interesting tool holder Don. I used to operate a Holbrook lathe, it had a double cross slide with a cam out lever to retract it. Really great lathe for screw cutting.

[@DonDyarprecision]

The Holbrook lathes are very rare here, there was a machine dealer that imported a few shipping containers of machines in the 1980s including Holbrook lathes. Those were very solid in appearance, but no one knew anything about them, thanks.

[@barrycaudle9926]

@@DonDyarprecision The one I worked also had the taper turning attached. But the real interesting one was set up for eliptical turning. The real cute part was that you could turn a cone that went from round to eliptical.

[@ypaulbrown]

Man oh Man, I gotta get one of those Hardinge tool holders.......

[@DonDyarprecision]

It is not as rigid as a regular holder, have to back off the cut a little.

[@danielwerger5641]

Great video's Don, keep'um coming please...! Hey, any chance you could share your lube recipe? I would love to try it...!!! Cheers from Vancouver Canada...

[@DonDyarprecision]

Here is a video I did on my other channel kzbin.info/www/bejne/bGSueaCer52Xm9U

[@ypaulbrown]

18:03 , my Dad always said, 'If you want to save your HAIR, get a Cigar Box'

[@DonDyarprecision]

That was great advice!

[@dutchgray86]

Nice bit of threading, those pull out holders make doing a fade out much easier and speed up single point threading greatly.

[@DonDyarprecision]

Axelson in the 1942 year put a threading stop and satin chrome dials on their lathes, this Hardinge sliding holder is good to 16 tpi with light cuts.