1987 Jet JTM-1 Milling Machine Manual

The Jet JTM-1 is a vertical milling machine manufactured in 1987, featuring variable speed control, R-8 spindle taper, power feed on the X-axis, manual operation on Y and Z axes, built-in coolant system, digital readout capability, and robust cast iron construction. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation & Setup 3. Specifications 4. Controls and Operation 5. Tooling and Setup 6. Maintenance Schedule 7. Lubrication Guide 8. Troubleshooting 9. Parts List 10. Safety Procedures 11. Warranty Information

Features at a Glance

Key components: Variable speed head, R-8 spindle, power feed table, manual quill feed, coolant system, cast iron base and column.

Feature	Description
Spindle Taper	R-8 for standard tooling
Speed Range	240-2760 RPM variable
Table Size	9" x 42" working surface
Power Feed	X-axis only, 0.002-0.006 IPR
Quill Travel	5" manual feed
Motor	1.5 HP, 110V/220V single phase
Coolant System	Built-in pump and reservoir
Weight	Approximately 1500 lbs
Column Construction	Heavy-duty cast iron
Base Construction	Reinforced cast iron with coolant tray

Installation & Setup

Uncrate and inspect for shipping damage. Requires proper foundation and leveling.

Foundation: Place on solid concrete floor; ensure level within 0.002" per foot.
Power Connection: Wire according to local codes; 220V single phase recommended for full power.
Leveling: Use precision level on table; adjust leveling feet until table is flat within 0.001".
Lubrication: Fill oil reservoirs before first operation.
Test Run: Run spindle at low speed for 30 minutes to distribute lubricants.

WARNING! Machine weighs 1500 lbs; use proper lifting equipment. Ensure electrical grounding.

Specifications

Model: JTM-1 Vertical Milling Machine
Year: 1987
Table Size: 9" x 42"
Longitudinal Travel (X): 30"
Cross Travel (Y): 12"
Vertical Travel (Z): 16"
Spindle Taper: R-8
Spindle Speed: 240-2760 RPM
Motor: 1.5 HP, single phase
Quill Travel: 5"
Net Weight: 1500 lbs
Power Requirements: 110V/220V, 20 Amp circuit

Controls and Operation

Front Panel: Speed control dial, spindle start/stop, emergency stop, power feed engagement.

Table Controls: Manual handwheels for X, Y, Z axes; power feed control lever; table locks.

Speed Control: Rotate dial while spindle is running to change RPM. Power Feed: Engage lever for automatic X-axis movement. Quill Feed: Manual handwheel with depth stop. Coolant Control: Valve and pump switch on front panel.

Tooling and Setup

R-8 collet system standard. Accepts end mills, drill chucks, face mills, and boring heads.

Tool Installation: Clean taper; insert tool; tighten drawbar securely.
Workholding: Use vise, clamps, or fixtures; ensure secure mounting.
Zero Setting: Use edge finder or indicator to establish workpiece zero.
Speed Selection: Refer to cutting speed charts for material being machined.
Feed Rates: Start with conservative feeds; adjust based on chip formation.

Tip: Always use sharp tools and proper cutting fluids for best results.

Maintenance Schedule

Interval	Task	Procedure
Daily	Clean ways and table	Wipe with clean cloth; apply way oil
Weekly	Check oil levels	Inspect all reservoirs; top up as needed
Monthly	Lubricate gears	Apply grease to gear train
Quarterly	Check belt tension	Adjust V-belt to proper tension
Annually	Complete inspection	Check all bearings, ways, and electrical

Lubrication Guide

Use only recommended lubricants for long machine life.

Ways and Slides: ISO VG 68 way oil
Gearbox: SAE 90 gear oil
Bearings: NLGI #2 grease
Coolant: Soluble oil mixed per manufacturer instructions

CAUTION! Never run machine without proper lubrication. Check oil levels daily.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Spindle won't start	Power issue, overload	Check circuit breaker; reset overload relay
Poor surface finish	Dull tools, wrong speed	Sharpen tools; adjust speed and feed
Excessive vibration	Unbalanced cutter, loose tooling	Balance cutter; check drawbar tightness
Power feed not working	Shear pin, electrical issue	Replace shear pin; check wiring
Overheating spindle	Low oil, excessive load	Check oil level; reduce cutting load

Parts List

Key replacement parts available through Jet distributors:

Spindle bearings (set of 2)
Drive belts (V-belt)
Shear pins for power feed
Quill return springs
Table handwheels
Coolant pump assembly
Motor brushes (if applicable)

Contact Jet Machinery for complete parts manual and ordering information.

Safety Procedures

Always follow these safety guidelines when operating the JTM-1:

Wear safety glasses at all times
Secure long hair and loose clothing
Use proper workholding devices
Never reach near rotating cutter
Stop machine before making adjustments
Use chip guards and shields
Keep floor clear of oil and chips

WARNING! Failure to follow safety procedures can result in serious injury.

Warranty Information

Original warranty: 1 year parts and labor from date of purchase (1987). Current support available through Jet Machinery. For technical assistance or replacement parts, contact:

Jet Machinery
Technical Support: 1-800-xxx-xxxx
Parts Department: 1-800-xxx-xxxx
Website: www.jettools.com

This manual covers basic operation and maintenance. Refer to factory documentation for complete technical specifications.