JET JTM-4VS-1 Mill with 3-Axis ACU-RITE 203 DRO (Knee) and X, Y & Z-Axis Powerfeeds is a professional-grade vertical milling machine from JET, engineered for machinists and shops that demand precision, versatility, and dependable performance. Built on the certified Meehanite casting process, this variable speed knee mill delivers consistent, reliable operation across a wide range of milling tasks - and comes fully equipped with a 3-axis ACU-RITE 203 digital readout and powerfeeds on all three axes for maximum productivity and positional accuracy.

Key Features

• Adjustable gibs throughout for precise fit and long-term accuracy maintenance
• Heavy duty splined motor drive for robust, dependable power transmission
• Internal coolant tank built into the casting base for use with a coolant system (coolant pump not included)
• Large diameter chromed quill for smooth, wear-resistant travel and extended service life
• One-shot lubrication system for fast, efficient lubrication of critical components
• Precision hardened and ground ways and table for consistent accuracy and surface integrity
• Spindle head is internally cooled to maintain performance during extended cutting operations
• Tolerance test sheet included to verify machine accuracy right out of the crate
• Precision bored and honed milling head ensures quality cuts on every pass
• Three-stage power downfeed with automatic stop for ease of use and repeatable results
• Variable speed spindle ranging from 60 to 4,200 RPM to suit a wide variety of materials and tooling
• 3-axis ACU-RITE 203 digital readout (DRO) on the knee for real-time positional feedback
• X, Y, and Z-axis powerfeeds for automated, consistent table movement and reduced operator fatigue
• Backed by JET's industry-leading two-year full service and parts warranty
• Available in single-phase power configuration (2 HP, 115/230V, 1Ph)

Specifications

• Stock Number: 690424
• Motor: 2 HP, 115/230V, 1Ph
• Range of Spindle Speeds: 60 - 4,200 RPM
• Spindle Taper: R-8
• Spindle Travel: 5 In.
• Quill Diameter: 3-3/8 In.
• Quill Down Feed Rates: .0015 - .003 - .006 IPR
• Collet Capacity: 1/8 - 7/8
• Table Longitudinal Travel: 34 In.
• Table Longitudinal Travel With Powerfeed: 28-3/4 In.
• Table Cross Travel: 12 In.
• Distance Spindle to Column (Max.): 19 In.
• Max Distance Spindle to Table: 17-1/2 In.
• T-Slot Centers: 2-1/2 In.
• Number of Axis: 3 (Knee)
• Powerfeed: X, Y and Z-Axis
• Style (Type): Variable Speed R8
• Overall Dimensions (L x W x H): 66 x 63 x 85 In.
• Prop 65: Cancer and Reproductive Harm
• Country of Origin: Taiwan

What's Included

• Tolerance test sheet to verify machine accuracy upon delivery
• ACU-RITE 203 3-axis digital readout (DRO) with knee axis
• X, Y, and Z-axis powerfeeds pre-installed

Frequently Asked Questions

What is the spindle speed range on the JET JTM-4VS-1, and what does variable speed mean for my work?

The JET JTM-4VS-1 offers a spindle speed range of 60 to 4,200 RPM. Variable speed capability allows the operator to dial in the precise RPM needed for different materials and cutter diameters without changing belt positions, resulting in faster setup times and optimized cutting performance across a broad range of applications.

Does this mill include a coolant pump?

No. While the machine features an internal coolant tank built directly into the casting base - making it ready for use with a coolant system - the coolant pump is not included and would need to be sourced separately.

What is the quill travel and quill diameter on this machine?

The quill provides 5 inches of spindle travel and features a large 3-3/8 inch diameter chromed quill. The chrome finish promotes smooth, consistent quill movement and helps resist wear over extended use. Down feed rates are available at .0015, .003, and .006 IPR.

What does the one-shot lubrication system do, and why does it matter?

The one-shot lubrication system allows the operator to simultaneously lubricate all critical moving components - such as the ways and table - with a single pump stroke. This simplifies routine maintenance, helps ensure consistent lubrication coverage, and extends the service life of the machine's precision hardened and ground ways and table.