Heald 74 INTERNAL GRINDER (EXTENDED BRIDGE)

74 HEALD INTERNAL GRINDER (EXTENDED BRIDGE)
YEAR: 1952

CAPACITIES:
Swing over table (straight work)........................ 26"
Maximum diameter of hole that can be ground............. 20"
Grinding stroke......................................... 62"
Taper swivel on work head.......................... 60° inc. angle
Center of chuck spindle from floor...................... 50"
Diameter of work head spindle flange.................... 12"
Hole through work head spindle.......................... 1 11/16"

SPEEDS AND FEEDS
Table speeds unlimited between............... 0 to 18 ft. per min
Work head speeds adjustable from............. a-c 41-62-82-123 RPM
Cross feed dial graduation represents................... .001"
Power feed adjustment........................ 1 to 6 teeth
Each ratchet tooth with coarse gears (standard)......... .0002"
Each ratchet tooth with fine gears (optional)........... .000128"

DRIVES
Pump motor............................... 2 HP, ac - 1200 RPM
Work head motor..1-1 1/2"-2-3 Tapered HP, ac-600-900-1200-1800 RPM
Wheel head motor......................... 7 1/2 HP, ac-3600 RPM

EQUIPMENT AND FEATURES
All trip dogs.
Cam facing stop.
Hydraulic table.
All pick feeds.
Single point dresser.
4 Speed work head.
24” 4 Jaw chuck.
62” Table stroke.
Manual & hydraulic table travel.
Swivel bed.
92” Extended bed.
Coolant tank & pump.
26” Swing over extended bed.
Automatic lube.
3 Point steady rest.
Standard flange workhead.
Variable speed traverse table.