JET JTM-4VS Mill with 3-Axis ACU-RITE 203 DRO (Knee), X/Y/Z-Axis Powerfeeds, and Power Draw Bar is a precision vertical milling machine from JET engineered for demanding machining operations that require accuracy, repeatability, and versatile speed control. Built on a Certified Meehanite casting process, this variable speed mill delivers consistent, reliable performance across a broad spindle speed range of 60 to 4,200 RPM, making it well-suited for toolrooms, job shops, and production environments where quality and efficiency are essential.

Key Features

• Adjustable gibs throughout for precise, fine-tuned axis alignment and reduced play
• Heavy-duty spindle brake for fast, controlled spindle stops between operations
• Heavy-duty splined motor drive engineered for reliable power transmission under demanding loads
• Internal coolant tank built into the casting base for use with a coolant system (coolant pump not included)
• Large diameter quill is chromed for durability and smooth, consistent travel
• One-shot lubrication system simplifies maintenance and ensures consistent way lubrication
• Precision hardened and ground ways and table for long-term accuracy and surface integrity
• Spindle head is internally cooled to maintain thermal stability during extended machining cycles
• Tolerance test sheet included to verify machine accuracy upon delivery
• Precision bored and honed milling head ensures quality, repeatable cuts
• Three-stage power downfeed with automatic stop for operator ease and process control
• ACU-RITE 203 3-Axis Digital Readout (DRO) on the knee provides real-time positional feedback on X, Y, and Z axes
• X, Y, and Z-axis powerfeeds for automated table movement and reduced operator fatigue
• Pneumatic power draw bar for fast, efficient tool changes
• Variable speed R-8 spindle taper configuration for broad tooling compatibility
• Available in single or three-phase power configurations
• Backed by JET's industry-leading Two-Year full service and parts warranty

Specifications

• MPN: JT9-690430
• Stock Number: 690430
• Country of Origin: Taiwan
• Motor: 3 HP, 230/460V, 3Ph
• 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 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
• Distance Spindle to Column, Max. (In.): 19
• Max Distance Spindle to Table (In.): 17-1/2
• Number of Axis: 3 (Knee)
• Powerfeed: X, Y and Z-Axis
• Power Draw Bar: Pneumatic
• Style (Type): Variable Speed R8
• Overall Dimensions (L x W x H) (In.): 66 x 63 x 85
• Prop 65: Cancer and Reproductive Harm

Frequently Asked Questions

What spindle speed range does the JET JTM-4VS offer?

The JET JTM-4VS provides a variable spindle speed range of 60 to 4,200 RPM, allowing operators to dial in the optimal cutting speed for a wide variety of materials and tooling diameters.

Does this mill include a coolant pump?

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

What type of power draw bar is included, and what does it do?

This mill includes a pneumatic power draw bar, which allows for fast and efficient tool changes by pneumatically engaging and releasing the R-8 collet or toolholder in the spindle - reducing downtime between setups.

How does the ACU-RITE 203 DRO benefit machining operations on this mill?

The ACU-RITE 203 3-Axis Digital Readout installed on the knee provides real-time positional data across the X, Y, and Z axes, enabling precise part positioning, reduced measurement errors, and faster setup times compared to relying solely on manual dials and handwheels.