JET JTM-4VS-1 Mill with 3-Axis ACU-RITE 203 DRO (Knee) with X-Axis Powerfeed is a professional-grade vertical milling machine from JET, engineered for machinists and shops that demand precision, repeatability, and durability in demanding milling operations. Built on a Certified Meehanite casting process foundation, this variable speed R-8 mill delivers consistent, reliable performance across a wide spindle speed range - from 60 to 4,200 RPM - making it equally capable for delicate finishing passes and aggressive material removal. The integrated ACU-RITE 203 3-axis DRO with knee readout and X-axis powerfeed streamline setup and operation, reducing manual effort and improving accuracy on every job.

Key Features

• Adjustable gibs throughout for precise fit and long-term accuracy retention
• Heavy duty splined motor drive for robust, reliable power transmission
• Internal coolant tank built into casting base for use with coolant system (coolant pump not included)
• Large diameter quill is chromed for smooth travel and extended wear resistance
• One shot lubrication system simplifies maintenance and protects critical moving components
• Precision hardened and ground ways and table for exceptional dimensional accuracy and surface finish
• Spindle head is internally cooled to maintain consistent operating temperatures during extended use
• Tolerance test sheet included for documented verification of machine accuracy at time of delivery
• Precision bored and honed milling head ensures quality cuts on every pass
• Three-stage power downfeed with automatic stop for controlled, repeatable quill depth operations
• 3-axis ACU-RITE 203 DRO with knee readout for real-time positional feedback across all axes
• X-axis powerfeed reduces operator fatigue during long longitudinal table traverses
• Variable speed drive provides stepless RPM adjustment from 60 to 4,200 RPM without changing belts
• Available in single phase power configuration (2 HP, 115/230V, 1Ph) for flexible shop installation
• Backed by JET's industry-leading two-year full service and parts warranty

Specifications

• MPN: JT9-691411
• Stock Number: 691411
• Style (Type): Variable Speed R8
• Number of Axis: 3 (Knee)
• Motor: 2 HP, 115/230V, 1Ph
• Range of Spindle Speeds (RPM): 60 - 4,200
• 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 49
• Table Longitudinal Travel (In.): 34
• Table Longitudinal Travel With Powerfeed (In.): 28-3/4
• Table Cross Travel (In.): 12
• T-Slot Centers (In.): 2-1/2
• Powerfeed: X-Axis
• Distance Spindle to Column, Max. (In.): 19
• Max Distance Spindle to Table (In.): 17-1/2
• Overall Dimensions (L x W x H) (In.): 66 x 63 x 85
• Country of Origin: Taiwan
• Prop 65: Cancer and Reproductive Harm

What's Included

• JET JTM-4VS-1 variable speed vertical milling machine
• ACU-RITE 203 3-axis DRO with knee readout
• X-axis powerfeed
• Tolerance test sheet

Frequently Asked Questions

What spindle taper does the JET JTM-4VS-1 use?

The JET JTM-4VS-1 uses an R-8 spindle taper, one of the most widely used standards in vertical milling machines, providing broad compatibility with collets, end mill holders, and tooling accessories across a collet capacity range of 1/8 to 7/8 inch.

Does this mill require three-phase power?

No. The JET JTM-4VS-1 is configured with a 2 HP, 115/230V, single-phase motor, making it suitable for shops and facilities that do not have three-phase power available.

Is a coolant pump included with this milling machine?

While the JET JTM-4VS-1 features an internal coolant tank built into the casting base for use with a coolant system, the coolant pump is not included and must be sourced separately.

What is the spindle speed range, and how is speed adjusted on this mill?

The JET JTM-4VS-1 offers a variable spindle speed range of 60 to 4,200 RPM. The variable speed drive allows stepless RPM adjustment within this range, eliminating the need to change belts or shift gears to match the optimal cutting speed for different materials and tool diameters.