MIL-L-23400 Lath, Engine And Tool Room, 19, 20 + 25 Inch 7-1/2 To 15 Hp \(S/S By A-A-59334\)This specification covers electric motor driven, metal turning and threading, engine and toolroom lathes. The lathes shall have either geared head drive or combination gear and belt drive with equipment and accessories as described herein.