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MILLERS, THREAD

24" x 144" Lees-Bradner #HTA12x144, thread miller, auto index, auto return, steady rest

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24" x 144" Lees-Bradner #HTA12x144, thread miller, auto index, auto return, steady rest
Lees Bradner Model HTA 12x144 Thread Miller, Max Part OD 12", Max Part Length Between Centers 144", Auto Index, Steady Rests


MACHINE SPECIFICATIONS:
Capacity between Centers 144"
Swing over Bed Ways 24"
Swing over Cutter Carriage (Max. Diam. Cap.) 12"
Min. Longitudinal Dist., Nose of Work Spindle to
Center of Cutter Swivel Head 7"
Max. Longitudinal Dist., Nose of Work Spindle to
Center of Cutter Swivel Head 45"
Min. Axial Distance, Centerline of Work Spindle
to Centerline of Cutter Spindle 0"
Max. Axial Distance, Centerline of Work Spindle
to Centerline of Cutter Spindle 9-1/12"
Floor Space 4'1"W x16'6
Net Weight 12,300 lbs

Capacity thru Work Spindle, Follow Rest, & Collet 6"
Max. O/S Diam., Sgl(Disc Type) Thrd Milling Cutter 7"
Max. O/S Diam., Ring (Hob)Type Thrd Milling Cutter 3-7/8"
Min. Effective Root Diameter of Cutter 2-7/8"
Distance, Centerline of Cutter Spindle to Front
Face of Cutter Head 1-3/8"
Max. Width, ring type cutter, using std. cutter Spindle
and cutter spindle outer support, no offset of hub 1-1/4"
Bore of Cutter, for standard cutter spindle 1-3/4"
Required Keyway of Cutter for Std. Cutter Spindle 1/4"x 1/8"or
7/16"x 3/16"
Pitch of Lead Screw 1/2"
Cutter Spindle Speeds Achieved by Means of a Variable
Speed Drive with a 20/1 Ratio. Speeds from 50 RPM to
200 RPM, or 200 to 800 RPM

Internal Taper in extended Spindle (Available as an extra
for the generation of internal threads), to receive
shank type cutter or cutter arbors for shell type cutter No. 10 B & S

Number of holes in Standard Index Plate 24
Divisions available using standard index plate: 2,3,4,6,9,12,
16,18,24,32,36 and 48.
Min. Lead Generated, Worm & Wheel Dr/Spur Gear Dr. 1/16"/1/32"
Max. Lead Generated, Worm & Wheel Dr/Spur Gear Dr. 60"/1"
Ratio of final drive to work spindle, Worm & Wheel Dr. 24 to 1
Ratio of final drive to work spindle, Spur Gear Drive 4 to 1
Min. Work Spindle Spd, Worm & Wheel/Spur Gear Dr. 1/20th/1/6th
Max. Work Spindle Spd, Worm & Wheel/Spur Gear Dr. 4/8 RPM

Machine Is Equipped With:
*Arbor
*Full set change gears
*Steady rests
*Auto index
*Auto return
*Variable speed cutter drive
*(2) new centers for tailstock
*Collet


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