Gallery, Projects and General > How to's
Metric Thread On Imperial Lathe
Bogstandard:
Very good instructional vid John.
All you need to do now is make a swing up toolholder, and halve everything that you had to do.
But honestly, can't fault what you showed.
Nice one
John
doubleboost:
Thanks John
I will have to make one
I should have videoed the other end
1 i/2 inch 8 tpi internal that was great fun :D :D :D :D
Ned Ludd:
Hi There,
I like your video clear and concise as all training videos should be.
I hope you will forgive a small criticism, have you not set the top/compound slide to 29.5 on the scale? Surely it should be 29.5 to the lathe axis, which should read 60.5 on the scale? If I have misread the situation I apologize.
Ned
EDIT It should be 29.5 to cross slide not lathe axis but otherwise info is correct
Blade:
Nice video!
Bogstandard:
--- Quote ---have you not set the top/compound slide to 29.5 on the scale? Surely it should be 29.5 to the lathe axis, which should read 60.5 on the scale?
--- End quote ---
You are quite right Ned, but there are actually two ways of doing it, the way John has shown, which gives much better control on the depth of cut, and to me, if doing super fine threads, I would use, but only with 60 deg thread forms, the sidewards feed is a little too much for 55 deg or lower threads, and you risk actually cutting the threads away and so going undersize on the OD.
Or the normally accepted way, which you mentioned, and gives a more aggressive depth of cut, but less sideways feed, and is the way I would use most of the time.
So if you are not into the fine complexities of single point threading, you are quite correct
In fact, I have marked up my cross slide with datums on all main points of the compass, so that whatever type of threads I want to cut, both left and right hand, I can set up the degree scale for the types of threads and tapers I need to cut, as the scale on my compound only goes to 45 degs either way of zero, and so I can't set it to the required 60.5 for 60 deg threads against the normal datum mark.
John
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