Hmm ... I'm not familiar with this lathe (it sounds like an
automatic screw machine) but with my lathe (bed turret replaces the
tailstock, and has no power feed) I do threading with Geometric die
heads, which cut to full depth with hand feed, and pretty much control
the feed once they start, and once it reaches full length of thread (the
stop on the turret stops the advance) the thread feeds the head just a
little farther and trips the dog which allows the four chasers (like the
jaws in a 4-jaw chuck) to spring outwards and the die head is withdrawn
over the still rotating workpiece.
For large diameter threaded holes (e.g. on camera extension
tubes) there are collapsing taps by Geometric which behave similarly
except inside out.
For tapping normal sized holes, the tap is in a releasing tap
holder which pulls free of a dog and allows the tap to rotate with the
workpiece until you can stop and reverse the spindle to back out of the
Sounds like you have an intersting toy.
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Ive got (3) Bechler A10s and (1) Bechler AR10 swiss screw machines. All
running nicely, very very good condition and available for very very
$1000 gets all 4 machines plus spares, tooling, bar feeders, manuals and
Located in So. California
And I really really need these gone.
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