JET JTM-4VS Mill with 3-Axis Newall DP700 DRO (Knee), X/Y/Z-Axis Powerfeeds, and Power Draw Bar is a professional-grade vertical milling machine from JET, engineered for machinists and production shops that demand precision, versatility, and efficient operation. Built on a Certified Meehanite casting process foundation, this variable speed knee mill combines a wide spindle speed range of 60 - 4,200 RPM, three-axis powerfeeds, a pneumatic power draw bar, and a Newall DP700 digital readout system to deliver accurate, repeatable results across a broad range of milling applications.

Key Features

• Adjustable gibs throughout for precise fit and reduced play across all axes
• Heavy-duty spindle brake for quick, controlled spindle stops
• Heavy-duty splined motor drive for reliable power transmission under load
• Internal coolant tank built into casting base for use with coolant system (coolant pump not included)
• Large diameter quill is chromed for smooth, durable travel and extended service life
• One-shot lubrication system simplifies routine maintenance and protects critical wear surfaces
• Precision hardened and ground ways and table for consistent accuracy and long-term stability
• Spindle head is internally cooled to maintain operating temperature during extended use
• Precision bored and honed milling head ensures quality, repeatable cuts
• Three-stage power downfeed with automatic stop for ease of use and controlled depth management
• 3-Axis Newall DP700 Digital Readout (DRO) on the knee for real-time position monitoring
• X, Y, and Z-axis powerfeeds for reduced operator fatigue and consistent feed rates
• Pneumatic power draw bar for fast, efficient tool changes
• Variable speed R-8 spindle configuration offering a range of 60 - 4,200 RPM
• Available in 3HP, 230/460V, 3-phase power configuration
• Tolerance test sheet included for verified out-of-box accuracy confirmation
• Backed by JET's industry-leading Two Year full service and parts warranty

Specifications

• MPN: JT9-690094
• Stock Number: 690094
• 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
• Number of Axis: 3 (Knee)
• Powerfeed: X, Y and Z-Axis
• Power Draw Bar: Pneumatic
• 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
• 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 Knee Mill
• Newall DP700 3-Axis Digital Readout (DRO) - Knee configuration
• X, Y, and Z-Axis Powerfeeds
• Pneumatic Power Draw Bar
• Tolerance test sheet

Frequently Asked Questions

What is the spindle speed range on the JET JTM-4VS, and how are speeds changed?

The JTM-4VS offers a variable spindle speed range of 60 to 4,200 RPM. The variable speed drive allows the operator to dial in the optimal cutting speed for a wide variety of materials and tooling without changing belt positions, making speed adjustments fast and convenient during production work.

What spindle taper does the JTM-4VS use, and what collet sizes are compatible?

The JTM-4VS uses an R-8 spindle taper, which is one of the most common standards in knee mill tooling. It accepts collets ranging from 1/8 inch to 7/8 inch, providing broad compatibility with standard end mills, drill chucks, boring heads, and other R-8 tooling.

Does the JTM-4VS include a coolant system?

The machine features an internal coolant tank built into the casting base, designed for use with a coolant system. However, the coolant pump is not included and would need to be sourced separately to take full advantage of the integrated coolant tank.

What are the powerfeed axis configurations and how does the DRO enhance operation?

This mill includes powerfeeds on the X, Y, and Z-axes, reducing operator fatigue during long production runs and promoting consistent feed rates. The Newall DP700 3-Axis DRO mounted on the knee provides real-time digital position readout, allowing the operator to achieve precise positioning quickly and accurately without manual calculation from handwheel dials.