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Martindale Super Lathe-Type Undercutter

     This undercutter is for handling large armatures in a a lathe.  It can be mounted directly on the lathe or on the Slide Carriage which bolts to the lathe cross-slide.
     The motor is 3/4 h.p. With Gear-belt drive it has enough power and rigidity to use 7/8" O.D. × 5/16" I.D. Tungsten-Carbide Saws at 4,600 r.p.m. By interchanging pulleys it will also use 7/8" O.D. × 5/16" I.D. High-Speed Steel Saws at 2,600 r.p.m.
     An alternate spindle assembly is available with a 3/8" arbor to use 1-1/8" O.D. × 3/8" I.D. Saws in either Tungsten-Carbide or High-Speed Steel.  It is longer and can be used with two saws to cut two slots at each pass with commutator bars up to 1/2" wide (User furnishes spacers to fit commutators being undercut).  Both spindle assemblies include the heavy and rigid spindle housing which bolts to the motor mount.
     The Heavy-Duty Slide Carriage runs on a variable speed, electric motor-driven screw drive complete with foot switch.  Speeds are adjustable in both directions.  The stroke is adjustable at both ends up to 21-3/4". It slides on "oilite" bushings on 1-1/2" hardened steel rods. A skewed bard adjustment is provided at the left end of the slide.

Left: Undercutter, for attachment to slide carriage, which is shown below, or direct to lathe

Super Lathe-Type Undercutter complete with Slide Carriage for attaching directly to the lathe:
  Catalog Number Catalog Number
115 V, 50/60 Hz, 5/16" Spindle LTHU200A5 LTHU201A5
115 V, 50/60 Hz, 3/8" Spindle LTHU200A3 LTHU201A3
230 V, 50/60 Hz, 5/16" Spindle LTHU200B5 LTHU201B5
230 V, 50/60 Hz, 3/8" Spindle LTHU200B3 LTHU201B3
Extra 5/16" Spindle Assembly LTHU445
Extra 3/8" Spindle Assembly LTHU443
Slide Only, A=115V. OR B=230V.
LTHU210 (A) OR (B)

Saw Spindle length: 12-3/4"

adjustment on support posts:

Slide Carriage (shown below)
Electric Motor-Driven Screw-Drive
Net Weight: Complete Unit 189 lbs.,
without Slide Carriage 62 lbs.
Shipping Weight: Complete Unit 303 lbs.,
without Slide Carriage 83 lbs.
Maximum Slide Travel: 21-3/4"
Base Length: 37"
Overall Length: 47-1/2"
Saws and V-Cutters
High Speed Steel O.D. I.D. Catalog Number
75-HS Saws 7/8" 5/16" HSMS75
75-VHS Cutters 7/8" 5/16' HSMSV75
96-HS Saws 1-1/8" 3/8" HSMS96
96-VHS Cutters 1-1/8" 3/8" HSMSV96
Tungsten-Carbide O.D. I.D. Catalog Number
75-TC Saws 7/8" 5/16" TUNS75
75-VTC Cutters 7/8" 5/16" TUNSV75
96-TC Saws 1-1/8" 3/8" TUNS96
96-VTC Cutters 1-1/8" 3/8" TUNSV96
For further specifications see H.S.S. or
Tungsten-Carbide Mica Saws

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