JET JTM-4VS Mill with ACU-RITE 203 DRO and X-Axis Powerfeed is a professional-grade vertical milling machine from JET, engineered for machinists and production environments that demand precision, durability, and versatile performance. Built on Certified Meehanite castings with precision hardened and ground ways and table, this variable speed mill delivers consistent, reliable cutting action across a wide range of milling operations. The integrated ACU-RITE 203 Digital Readout and X-Axis Powerfeed elevate productivity and accuracy, while the broad spindle speed range of 60 - 4,200 RPM makes this machine adaptable to a wide variety of materials and cutting requirements. Backed by JET's industry-leading two-year full service and parts warranty, the JTM-4VS is a long-term investment in shop capability.

Key Features

• Adjustable gibs throughout for precise, user-tunable fit and reduced wear over time
• Heavy duty splined motor drive provides robust, dependable power transmission
• Internal coolant tank built into the casting base for use with coolant system (coolant pump not included)
• Large diameter quill is chromed for smooth travel and extended surface life
• One shot lubrication system simplifies maintenance and protects critical moving components
• Precision hardened and ground ways and table ensure accuracy and long-term dimensional stability
• Spindle head is internally cooled to maintain consistent operating temperatures during prolonged use
• Tolerance test sheet included, verifying machine accuracy directly from the factory
• Certified Meehanite casting process delivers superior vibration damping and structural integrity
• Precision bored and honed milling head ensures quality, repeatable cuts
• Three-stage power downfeed with automatic stop for controlled, operator-friendly drilling and boring
• X-Axis Powerfeed included for consistent, hands-free longitudinal table movement
• ACU-RITE 203 DRO provides real-time positional feedback for improved accuracy and reduced setup time
• Variable spindle speed range of 60 - 4,200 RPM accommodates a broad spectrum of materials and tooling
• Available in single or three phase power configurations

Specifications

• MPN: JT9-690107
• Stock Number: 690107
• Style (Type): Variable Speed R8
• 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 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
• Distance Spindle to Column (Max.) (In.): 19
• Max Distance Spindle to Table (In.): 17-1/2
• Number of Axis: 2
• Powerfeed: X-Axis
• 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 Variable Speed Milling Machine
• ACU-RITE 203 Digital Readout (DRO)
• X-Axis Powerfeed
• Tolerance test sheet

Frequently Asked Questions

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

The JTM-4VS uses an R-8 spindle taper, one of the most common and widely supported tapers in vertical milling, compatible with a broad range of collets, end mill holders, and tooling accessories. The collet capacity spans 1/8 to 7/8 inch.

What is the spindle speed range on this mill?

The JTM-4VS features a variable spindle speed range of 60 to 4,200 RPM, allowing operators to dial in the appropriate cutting speed for a wide variety of materials, from soft aluminum to harder steels, without changing belt positions.

Does this machine include a coolant pump?

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

What does the included ACU-RITE 203 DRO add to this mill?

The ACU-RITE 203 Digital Readout provides real-time positional data along the machine's axes, enabling operators to make precise movements, reduce measurement errors, and significantly speed up setup and machining operations compared to relying solely on manual dials and handwheels.