For No. 7A combination turret lathe Alfred Herbert, Ltd, have developed new headstock containing variable-speed mechanism which is claimed to be revolutionary advance on previous designs; as name Preoptive implies, any spindle speed in range can be chosen at any time, whether lathe is cutting or not. (See also Machy (Lond) v 43 n 1114 Feb 15 1934 p 601-2; Engineer v 157 n 4074 Feb 9 1934 p 158; Engineering v 137 n 3558 Mar 23 1934 p 345-6; Mech Eng v 56 n 5 May 1934 p 292-3; Mech World v 95 n 2462 Mar 9 1934 p 234-5; and French abstract in Genie Civil v 105 n 10 Sept 8 1934 p 222)
Herbert patent preoptive headstock
Automobile Engr
Automobile Engineer ; 24 , n 317
1934
2 pages
Aufsatz (Zeitschrift)
Englisch
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Railway vehicle headstock cover, headstock and railway vehicle
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