Left Hand Internal Acme Thread part one

Description
Metric lathe
Set up to cut Imperial threads

[AmateurRedneckWorkshop]

Thread cutting is the most fun you can have on a lathe.  It is sort of satisfying to see the threads grow from the metal.  Thanks for the video.

[roswalt]

When those nuts didn't want to come off I was afraid that someone had messed something up and you were going to have to fix someone elses' carelessness.
Thanks for another great video.

[berockization]

Tom Lipton (oxtool) showed how to cut metric threads with an imperial leadscrew -- while disengaging the halfnut after each cut.  This technique should work the other way around.   Thanks for all the videos -- you're my favorite youtuber!

[georgesmillion]

Toujours des explications claires !!!!
Merci John .
Georges

[stangordon]

Dont you just love it when a plan starts to come together, Nice to see the sorting out of the TPI hard work paying off.
Regards
Stan

[dickda]

Very nice John. I owned a German metric and a Chinese imperial lathe - and a lot of gears!

[swarfrat]

John,
Thanks for the threading and gear change video. Hope the item you will be threading works out fine. It's a pain when you have a metric lead screw as you can't use the thread chasing dial. You have to resort to the reverse the lathe routine.
Have a good one. Regards to Debs.
Dave

[EVguru]

Hi John,

I recall I've run into the stud gear interfering with the spindle myself. In my set I think there's a gear with slightly reduced OD that's meant to be used for the job. The spindle extension is also the locknut for the rear bearing preload adjustment.

[pdschu]

John, I really appreciate your effort in making the videos. I have learned so much from you. You give so many useful tips that we beginners can use. Would you consider talking more about speeds when you are turning and milling. I notice you frequently run at a faster speed when seeking a better finish. I could really benefit from more about what speeds you use for each operation, metal, and why you choose that speed. I am sure others new at machining would also benefit as well.
I had to look up info about the Geordie dialect, but I have gotten quite good at understanding it.
Best wishes to Debs. I have praying for both of you as you face this illness.

Paul

[WAVETUBE]

thanks for walking us throught the gear change process.

[johnkinnane]

G'day John thanks for that it was good to see the gear change process from metric to imperial John

[juanrivero]

Wonderful. The process of cutting Imperial gears on a Metric latha or viceversa is an exercise in what the British call "maths". The essential is to find a series of gears that will give you a ratio close as possilbe to 254/100 to one. Or its inverse. I am glad your manufacturer solved the problem for you! There is always a joker in the pack, and that in you case is the 63 tooth gear. In the Imperial lathe, the joker is usually 127 teeth. A prime number. I am interested by the 63, because it is not prime. Some time ago there was some correspondence in _Model Engineering_  mag on cutting BA threads on a lathe. I am sure you know all about BA threads. It turned out there was a program on the 'net  that gave you the proper ratios. BA threads are oddball. Swiss standards: metric. But the area increases by 2 as the number goes up, so diameters go as square root of two, an uncomfortable number. Pitch specified as some function of diameter so you get something like a .396 (making this up) mm pitch. How on earth do you cut a .396 mm pitch? Internet to the rescue. There is a program available on the 'net that will give you ratios for almost anything. Editor published final result for a Myford lathe so totally uninteresting to you. But nice to know there is an "app" as the modern generation calls it. I apologize for the length of this comment. But I find it very interesting. And I am lazy so you will have to search for the app.

[KnolltopFarms]

Great explanation of the banjo, it comes at a time when I'm learning about the calculations on different gear combinations and the pitches they will cut on my manual gear change South Bend.

Only variation of vocabulary is possibly what we call a compound gear you call a conversion gear, but I'm just learning this stage so I could be wrong. Either way it's great stuff.

Thanks for the video and please accept my Best Wishes for the Mrs., Aloha until next time...Chuck

[ianbertenshaw]

Excellent video ! that lathe is a nice piece of kit!
Just had a thought about thread cutting where you need to keep the half nuts closed- has any one ever thought of making a tool holder that works like the clapper box on a shaper so the tool would ride up over the work piece when you reverse the spindle ?

[marceltimmers]

Hi mate.
Can't wait to see the next instalment.  It's a bit like Paton Place, to be continued.
Hope Deb is well.
Marcel.

[investme]

I want the "ghost" that at 7:39 helped re-position your gears :>)

[tonyburndred]

Hi John
On your feed rate chart on the lathe, if you undo the two screws on the plate I think the imperial settings are on the back, love the videos, and wish Debs well from me.
Tony

[scheppach]

It might be worth taking a skim off the spindle extension John, in case you have to do more imperial work.

[madcapmartin]

John, Your videos make my day, I can't wait for part two because I think the air is going to turn blue somewhere along the line, , with hindsite don't you think you should have called yourself "Tourettes engineering" instead of "Twastard engineering" (only joking, keep up the good work mate). P.S> God bless to Debs, Hope she's feeling betterxxx

[kerrywil]

Thanks for the video. What insert are you using to cut acme threads? Thank you