JET JTM-1 Step Pulley Milling Machine 230V 3Ph is a precision-engineered vertical knee mill from JET, purpose-built for demanding metalworking and machining operations where accuracy and rigidity are non-negotiable. With a generous 9 x 42 in. table, 16 spindle speeds spanning 80-5,440 RPM, and a 2 HP, 230V, 3Ph motor, this step pulley mill delivers the versatility and power required for a wide range of milling, drilling, and boring tasks. Certified Meehanite castings provide the rugged, vibration-dampening foundation that seasoned machinists rely on, while Class 7 spindle bearings and an internally cooled spindle head ensure exceptional precision and long-term reliability. Every machine ships with a tolerance test sheet, reflecting JET's commitment to quality - and is backed by the industry-leading JET Two Year Warranty.

Key Features

• Heavy duty splined motor drive for reliable, high-torque power transmission
• Internal coolant tank built into base for use with coolant system (coolant pump not included)
• Large diameter quill is chromed for smooth, precise movement and long service life
• One shot lubrication system simplifies maintenance and protects critical wear surfaces
• Precision bored and honed milling head for superior accuracy and finish quality
• Precision hardened and ground ways ensure consistent, repeatable travel throughout the full range of motion
• Satin chrome finished dials for easy, accurate reading during setup and operation
• Tolerance test sheet included, confirming factory-verified precision standards
• Three-stage power down feed with automatic stop for controlled, repeatable depth drilling
• High precision Class 7 spindle bearings minimize runout and maximize surface finish quality
• Certified Meehanite castings deliver exceptional rigidity and vibration dampening
• Internally cooled spindle head prevents heat buildup and seizing during extended operation
• R-8 spindle taper - the industry-standard for tooling compatibility and quick changeovers
• 16 spindle speeds (80-5,440 RPM) cover a broad range of materials and cutting tools

Specifications

• MPN: JT9-690082
• Country of Origin: Taiwan
• Motor: 2 HP, 230V, 3Ph
• Style (Type): Step Pulley R8
• Number of Spindle Speeds: 16
• Range of Spindle Speeds (RPM): 80-5,440
• Spindle Taper: R-8
• Spindle Travel (In.): 5
• Quill Diameter (In.): 3-3/8
• Quill Down Feed Rates (IPR): .0015-.003-.006
• Collet Capacity: 1/8-7/8
• Table Size (L x W) (In.): 9 x 42
• Table Longitudinal Travel (In.): 23-7/8
• Table Longitudinal Travel With Powerfeed (In.): 20-2/7
• Table Cross Travel (In.): 12-1/2
• T-Slot Centers (In.): 2-1/2
• Travel of Knee (In.): 14
• Max Distance Spindle to Table (In.): 17-1/2
• Distance Spindle to Column (Max.) (In.): 19
• Overall Dimensions (L x W x H) (In.): 57 x 64 x 82
• Prop 65: Cancer and Reproductive Harm

What's Included

• Tolerance test sheet confirming factory precision standards

Frequently Asked Questions

What is the spindle speed range on this milling machine?

The JET JTM-1 Step Pulley Milling Machine offers 16 spindle speeds ranging from 80-5,440 RPM, giving operators the flexibility to machine a wide variety of materials - from tough steel to aluminum and plastics - with optimal cutting performance.

Does this machine include a coolant pump?

The machine features an internal coolant tank built into the base for use with a coolant system; however, the coolant pump is not included and must be purchased separately.

What spindle taper does the JTM-1 use, and what collet sizes are compatible?

The JTM-1 uses an R-8 spindle taper, which is the industry-standard taper widely supported by tooling manufacturers. It accepts collets ranging from 1/8-7/8 in., providing broad compatibility with end mills, drill chucks, and other common tooling.

What power down feed rates are available, and is there an automatic stop?

The JTM-1 provides a three-stage power down feed with quill down feed rates of .0015-.003-.006 IPR. The machine also features an automatic stop on the power down feed, allowing operators to drill or bore to a precise, repeatable depth without manual intervention.