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Stock# 071857 
Category: Lathes
Subcategory: Engine
Manufacturer: SUMMIT
Model: 20-4 X 80
Status: New
SUMMIT (NEW) MODEL 20-4-80 ENGINE LATHE

CAPACITY
20-1/4" SWING OVER BED
11-7/8" SWING OVER CROSS SLIDE
27-5/8" SWING OVER GAP
15" GAP
8-3/8" GAP IN FRONT OF FACEPLATE

WORKPIECE WEIGHTS
400 LBS AT THE HEADSTOCK
2,000 LBS BETWEEN CHUCK AND TAILSTOCK
4,000 LBS CHUCK & TAILSTOCK WITH STEADY REST

HEADSTOCK
15 SPINDLE SPEEDS 11.5-1400 RPM
4-1/8" HOLE THROUGH SPINDLE
D1-8 SPINDLE NOSE
MT#6 HEADSTOCK CENTER

QUICK CHANGE GEARBOX
64 THREADS PER INCH 1/4 - 60
64 METRIC THREADS 0.5 - 120
64 MODULE THREADS 0.125 - 30
64 DIAMETRAL PITCH 1 - 240
124 LONGITUDINAL FEEDS 0.00145 - 0.44474
56 CROSS FEEDS 0.0007 - 0.22237
2" LEADSCREW DIAMETER 2 TPI
1" FEED ROD DIAMETER

CARRIAGE AND APRON
11-3/8" CROSS SLIDE TRAVEL
5-3/8" COMPOUND REST TRAVEL
0.020 GRADUATION OF APRON HANDWHEEL
0.002 GRADUATION OF CROSS SLIDE HANDWHEEL

TAILSTOCK
9-1/2" SPINDLE BARREL TRAVEL
3-1/2" SPINDLE BARREL DIAMETER
MT#5 CENTER TAPER
TWO SPEED 1:1 4:1

BED
15-3/4" WIDE
16-7/8" DEEP
42-48 BED HARDNESS (ROCKWELL C)

TAPER ATTACHMENT
+/- 10 DEGREES OF TAPER
15-3/4" MAXIMUM TURNING LENGTH PER SETTING

MOTORS
10 HP MAIN
1/8 HP COOLAND PUMP

STEADY AND FOLLOW REST
1/2" - 6-1/8" STANDARD STEADY REST
5" - 11" EXTRA CAPACITY STEADY REST
1/2" - 7-7/8" FOLLOW REST

FEATURES
INCH AND METRIC THREADS WITH SINGLE SWITCH LEVER
CUTS MOST INCH/METRIC THREADS W/O GEAR CHANGE
HARDENED AND GROUND BEDWAYS
FORCED LUBE TO HEADSTOCK, CARRIAGE AND BEDWAYS
MECHANICAL DISC CLUTCH
REMOVAVBLE GAP
PRECISION 3-BEARING SPINDLE
CROSSFEED AND THREADING SAFETY INTERLOCK
FEED REVERSING AT THE APRON
4-WAY RAPID TRAVERSE
SINGLE LEVER CONTROL FOR FEEDS AND SPEEEDS
2-SPEED TAILSTOCK

ACCESSORIES INCLUDED
STANDARD STEADY REST
EXTRA CAPACITY STEADY REST WITH ROLLERS
FOLLOW REST
THREAD DIAL
COOLANT SYSTEM
TAPER ATTACHMENT
12" 3-JAW CHUCK WITH 2-PIECE JAWS
CARRIAGE STOP
WORK LIGHT
FULL LENGTH SPLASH GUARD
SERVICE WRENCHES AND SPANNERS

OPTIONS INCLUDED
12" STEEL BODY PRECISION CHUCK UPGRADE
20" SEMI-STEEL 4-JAW CHUCK
ALORIS QUICK CHANGE TOOL POST WITH HOLDERS
NEWALL 2-AXIS DIGITAL READOUT - INSTALLED











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