JET JTM-4VS Mill w/3-Axis ACU-RITE 203 DRO (Quill) w/XY & Z-Axis Powerfeeds 460V is a professional-grade vertical milling machine from JET, engineered for demanding machining operations that require precision, repeatability, and operator control. Built on a Certified Meehanite casting process, this variable speed mill pairs a 3 HP, 460V three-phase motor with an ACU-RITE 203 Digital Readout system and XY and Z-axis powerfeeds, delivering a complete, production-ready milling solution for serious machine shops and industrial environments.

Key Features

• Adjustable gibs throughout for precise fit and long-term accuracy
• Heavy duty splined motor drive for reliable, consistent power transmission
• Internal coolant tank built into casting base for use with coolant system (coolant pump not included)
• Large diameter quill is chromed for durability and smooth operation
• One shot lubrication system for simplified, thorough machine maintenance
• Precision hardened and ground ways and table for accurate, repeatable cuts
• Spindle head is internally cooled to maintain performance during extended operation
• Tolerance test sheet included for verified out-of-box accuracy
• Precision bored and honed milling head ensures quality cuts
• Three-stage power downfeed with automatic stop for ease of use
• Variable spindle speed range of 60 - 4,200 RPM for versatile material and tooling compatibility
• 3-axis ACU-RITE 203 DRO with quill axis for real-time position readout
• XY and Z-axis powerfeeds for reduced operator fatigue and consistent feed rates
• R-8 spindle taper accepts a wide range of standard tooling
• Large 9 x 49 in. work table with 660 lb. weight capacity

Specifications

• Stock Number: JT9-690141-4
• Model Number: JTM-4VS
• Country of Origin: Taiwan
• Motor: 3 HP, 230/460V, 3Ph
• Number of Axis: 3 (Quill)
• Powerfeed: X and Y-Axis
• 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
• Work Table Weight Capacity (Lbs.): 660
• Distance Spindle to Column (Max.) (In.): 19
• Max Distance Spindle to Table (In.): 17-1/2
• Travel of Knee (In.): 14-1/2
• Travel of Ram (In.): 13-3/8
• Overall Dimensions (L x W x H) (In.): 66 x 63 x 85
• Weight (Lbs.): 2420
• Style (Type): Variable Speed R8
• Prop 65: Cancer and Reproductive Harm

What's Included

• JET JTM-4VS Variable Speed Milling Machine
• ACU-RITE 203 3-Axis Digital Readout (Quill)
• XY and Z-Axis Powerfeeds
• Tolerance test sheet

Frequently Asked Questions

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

The JTM-4VS uses an R-8 spindle taper, which is one of the most widely used standards in vertical milling. It accepts collets ranging from 1/8 in. to 7/8 in., providing broad tooling compatibility for a variety of milling, drilling, and boring applications.

What is the spindle speed range of this machine?

This mill features a variable spindle speed range of 60 to 4,200 RPM. The variable speed design allows operators to dial in the optimal cutting speed for different materials and tooling without changing gears or belt positions.

Does this mill include a coolant pump with the built-in coolant tank?

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

What voltage is required to operate the JT9-690141-4 configuration?

This specific configuration is rated for 460V, three-phase power. The motor is listed as 3 HP, 230/460V, 3Ph, but this model (JT9-690141-4) is the 460V variant and should be connected to an appropriate 460V three-phase power supply.

Note: Coolant pump is not included with this machine. A compatible coolant pump must be purchased separately for use with the internal coolant tank. This machine operates on 460V, three-phase power - verify available power supply before installation.