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Posted by Wayne Weedon on August 15, 2006, 11:22 am
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anotherid wrote:
> I've been playing around with my new (BH600) lathe and have been
> practising cutting screw threads. What's the rule for determining how
> deep to cut a thread? One book I have says pitch x 0.64, a website I
> found said pitch x 0.7 and another said pitch x 0.8. Maybe it's
> different for different sorts of threads?
You need some data. It very much depends on the thread form. For a
lot of threads you can just consult a Zeus book, if you dont already
have one then it's a useful thing to have.
>
> I also read that one can cut a thread with the topslide square on to
> the workpiece (as I have been) or with it at an angle (e.g. 30 degrees
> for a metric thread) to the workpiece. Any recommendations on which way
> to use?
Unless I'm in a big rush or it's a fine thread I alway use the setover
method. It's easier and kinder on the tool, and you dont have to
remember your last crosslide setting as all feeding is done on the
compound slide.
Wayne....
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> practising cutting screw threads. What's the rule for determining how
> deep to cut a thread? One book I have says pitch x 0.64, a website I
> found said pitch x 0.7 and another said pitch x 0.8. Maybe it's
> different for different sorts of threads?