Turning – Lathe for screw cutting
Patent
1995-06-07
1997-05-06
Rachuba, M.
Turning
Lathe for screw cutting
409 65, 409 76, 409 18, B23G 100
Patent
active
056260644
ABSTRACT:
In an otherwise conventional, mechanically controlled lathe the workpiece support spindle can be disconnected from the main mechanical drive transmission and coupled to the main drive motor via a second mechanical transmission which can introduce an angular offset between the workpiece support spindle and a milling tool that is proportional to the travel along the feed axis of a toolholder carriage carrying the milling tool. The angular offset is introduced by a coupling sleeve coupling two transmission half-shafts via helical teeth to transmit movement to the workpiece support spindle. The coupling sleeve is moved axially by the toolholder carriage. In this way straight threads and helical threads with a large pitch can be cut on an otherwise conventional lathe.
REFERENCES:
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patent: 1461219 (1923-07-01), Miller
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patent: 2405485 (1946-08-01), Barkstrom et al.
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patent: 3308695 (1967-03-01), Hagerman
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patent: 5165137 (1992-11-01), Amrein et al.
"Thread-generating Machine Adapted for Both Threadng and Forming", Machinery, vol. 74, No. 1902, pp. 446-448 (1949).
Gradel Pierre
Revillod Delisle Serge
Eilberg William H.
Rachuba M.
Tsai Henry W. H.
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