Originally Published EMDM November 2005
EQUIPMENT NEWS
Thread-whirling attachment for subspindle reportedly is industry first
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Equipment dedicated to screw-threading operations is rendered unnecessary by thread-whirling attachments that can be installed on turning centres and used to achieve burr-free threads on orthopaedic and dental screws. Tornos S.A. (Moutier, Switzerland), which has included thread-whirling capabilities on its Deco Swiss-style turning machines for years, now offers enhancements to its thread-whirling unit and has introduced a larger external thread-whirling attachment for use in counter operations.
A new thread-whirling attachment that operates on the machine subspindle, or counterspindle, is an industry first. The attachment is designed to facilitate whirling of the larger threads usually found on bone screws for the hip. The Deco 20a or 26a machine so equipped can completely manufacture such parts in one setup; drilling, turning, gun drilling, milling, broaching, deburring, tapping, and part cutoff are performed with the main spindle, and, on the opposite end of the part, the counterspindle takes care of drilling, thread whirling, thread deburring, and milling.
The ability to machine the thread in counter operations often allows the user to manufacture screws without secondary operations or the need for any other machine tool. The thread of one screw can be cut in the subspindle while the main spindle produces another part, a further productivity advantage.
Also available is a thread-whirling device that employs carbide form tools and replaceable tooling inserts. It adapts easily to the Tornos whirling units. This Schwanog-made device is designed to maximize cutting speed and tool life while imparting fine finishes to titanium and stainless-steel parts.
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