Grizzly G4003 Lathe Manual

The Grizzly G4003 is a 12" x 36" Gunsmith Lathe with a 2 HP single-phase motor, 9-speed gearbox, D1-4 camlock spindle, inch/metric threading capabilities, and a heavy-duty cast iron construction. It features a quick-change gearbox, forward/reverse spindle control, automatic longitudinal feed, and a large selection of accessories. Below are key sections for safety, features, installation, setup, operation, and maintenance.

Features at a Glance

Key components: Heavy-duty cast iron bed, D1-4 camlock spindle, Quick-change gearbox, Apron with automatic feed, 9-speed gear head, Inch/metric threading capability.

Feature	Description
Spindle	D1-4 camlock, 1-9/16" through hole
Motor	2 HP, 110V/220V single-phase
Swing over bed	12 inches
Distance between centers	36 inches
Spindle speeds	9 speeds, 70-1400 RPM
Threading range	4-112 TPI (inch), 0.2-7 mm (metric)
Cross slide travel	6-1/4 inches
Tailstock taper	MT#3
Quick-change gearbox	For easy thread and feed selection
Automatic feed	Longitudinal and cross feed

Installation

Unpack and inspect all components. Place on a solid, level foundation.

1. Foundation: Use a heavy-duty workbench or concrete floor with leveling feet.
2. Electrical: Connect to appropriate 220V single-phase outlet with proper grounding.
3. Leveling: Use precision level on bed ways; adjust leveling feet until bed is level in all directions.
4. Lubrication: Fill oil reservoirs with recommended ISO 32 hydraulic oil before operation.

WARNING! Lathe weighs approximately 800 lbs; use proper lifting equipment and multiple persons. Ensure all bolts are tightened securely.

First-Time Setup

After installation, perform initial setup procedures.

1. Clean all surfaces: Remove protective grease with mineral spirits.
2. Lubrication: Fill headstock, apron, and gearbox with recommended oil.
3. Alignment: Check tailstock alignment with test bar; adjust if necessary.
4. Test run: Run spindle at lowest speed for 10 minutes to distribute oil.
5. Backlash adjustment: Adjust cross slide and compound rest gibs for minimal play.

CAUTION! Always wear safety glasses. Keep hands away from moving parts during test runs.

Specifications

• Swing over bed: 12 inches
• Distance between centers: 36 inches
• Spindle bore: 1-9/16 inches
• Spindle nose: D1-4 camlock
• Motor: 2 HP, single-phase, 110V/220V
• Spindle speeds: 70, 110, 180, 270, 400, 560, 800, 1120, 1400 RPM
• Threads: 4-112 TPI (inch), 0.2-7 mm (metric)
• Longitudinal feeds: 0.0015-0.027 inches per revolution
• Cross feeds: 0.00075-0.0135 inches per revolution
• Weight: Approximately 800 lbs

Controls and Settings

Main controls located on headstock and apron.

Headstock controls: Speed selector levers (A, B, C), Thread/feed selector, Spindle forward/neutral/reverse lever, Emergency stop button.

Apron controls: Automatic feed engagement lever, Feed direction selector, Half-nut lever for threading, Carriage handwheel, Cross slide handwheel, Compound rest handwheel.

Quick-change gearbox: Selector levers for thread pitch and feed rate. Refer to chart on gearbox cover for settings.

Tailstock: Handwheel for quill extension, Locking lever, Offset adjustment for taper turning.

Accessories & Attachments

Standard accessories included: 3-jaw chuck, 4-jaw chuck, Faceplate, Steady rest, Follow rest, Tool post, Centers (live and dead), Wrenches, Chip tray.

1. Chuck installation: Mount on D1-4 spindle using camlock pins; tighten in star pattern.
2. Tool post: Use quick-change tool post for efficient tool changes.
3. Steady rest: Support long workpieces to prevent deflection.
4. Follow rest: Support workpiece directly behind cutting tool.

Tip: Clean mating surfaces before installing accessories. Lubricate centers regularly.

Basic Operation

Standard turning procedures for the G4003 lathe.

1. Workpiece setup: Secure in chuck or between centers; ensure proper alignment.
2. Tool setup: Install cutting tool at center height; tighten securely.
3. Speed selection: Choose RPM based on material and operation (refer to speed chart).
4. Feed selection: Set quick-change gearbox for desired feed rate.
5. Starting cut: Engage half-nut or automatic feed; make light initial cuts.
6. Measurement: Stop lathe before measuring; use micrometers or calipers.
7. Facing: Use cross slide for facing operations.
8. Taper turning: Offset tailstock or use compound rest for tapers.

WARNING! Never leave chuck key in chuck. Remove all tools from bed before starting lathe. Stop lathe completely before changing speeds.

Threading Guide

Using the quick-change gearbox for threading operations.

1. Select thread: Set gearbox levers according to threading chart.
2. Engage half-nut: At precise moment using threading dial indicator.
3. Depth of cut: Use compound rest set at 29° for incremental cuts.
4. Disengage: Reverse spindle or disengage half-nut at end of cut.
5. Metric threading: Install metric translation gears (included).

Note: Practice on scrap material first. Always disengage half-nut before reversing carriage.

Maintenance Schedule

Regular maintenance ensures optimal performance and longevity.

Interval	Task
Daily	Clean chips, lubricate ways with way oil
Weekly	Check oil levels in headstock and apron
Monthly	Clean and lubricate gears, check belt tension
6 Months	Change headstock oil, check alignment
Yearly	Complete lubrication, inspect all components

Lubrication: Use ISO 32 hydraulic oil for headstock and apron. Use way oil for bed ways. Grease gears annually.

Warranty Information

Grizzly Industrial provides a 1-year limited warranty covering defects in materials and workmanship. Warranty applies to original purchaser with proof of purchase. Does not cover normal wear, misuse, or improper maintenance. For warranty claims, contact Grizzly Technical Support with model and serial numbers.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Excessive vibration	Unbalanced workpiece, improper leveling	Balance workpiece; re-level lathe; check foundation
Poor surface finish	Dull tool, incorrect speed, loose tool post	Sharpen tool; adjust RPM; tighten tool post
Threads not accurate	Incorrect gearbox setting, worn gears	Verify gearbox settings; inspect gears for wear
Overheating	Insufficient lubrication, excessive load	Check oil levels; reduce depth of cut
Carriage not moving	Feed lever not engaged, broken shear pin	Engage feed lever; replace shear pin
Spindle won't turn	Emergency stop engaged, motor issue	Disengage emergency stop; check motor connections

Technical Support: 1-800-523-4777 (Grizzly Industrial)

Parts: Order replacement parts through Grizzly website using model G4003