MONARCH SERIES 91 MANUAL LATHE

Technical Description

The Monarch Series 91 Manual Lathe is a heavy-duty engine lathe designed for large-scale machining with a 48" swing over bed and 36" swing over cross slide, enabling precision work on substantial components. It features a 132" distance between centers, accommodating long workpieces. The spindle boasts a 4 1/16" bore with a No. 7 Morse taper and a No. 450 American Standard taper, supported by precision tapered roller bearings and an 11" D-1 American Standard Camlock spindle nose. The lathe is equipped with 36 spindle speeds ranging from 6 to 750 RPM, allowing versatile machining operations. The leadscrew has a diameter of 2 1/2" with 2 threads per inch, supporting thread cutting from 1/2 to 28 TPI and feed rates from 0.0035" to 0.196" per revolution. The tailstock spindle is 7 1/4" in diameter with 12" travel and ±1/2" set-over adjustment for precise alignment. The 47" long carriage with a 14 1/2" bridge width supports a 2" x 2" tool size and includes a compound rest with 7" top slide travel. Power rapid traverse speeds of 0-180 IPM for the carriage and 0-90 IPM for the bottom slide enhance operational efficiency. The lathe bed measures 31 1/2" wide and 25 1/2" deep, providing stability for heavy machining. It is powered by a 50 HP main drive motor and weighs approximately 37,195 lbs. The overall machine dimensions are roughly 288" x 87" x 60". This lathe is suited for high-precision, heavy-duty turning and threading applications in industrial environments.