JET JTM-4VS Mill with 3-Axis ACU-RITE 203 DRO (Knee) with X-Axis Powerfeed is a professional-grade variable speed vertical milling machine from JET, engineered for machinists and metalworking shops that demand precision, durability, and versatile performance. Built using the Certified Meehanite casting process, this mill delivers consistent and reliable operation with a precision bored and honed milling head, a three-stage power downfeed with automatic stop, and an integrated ACU-RITE 203 3-Axis DRO for accurate knee-axis positioning - all backed by JET's industry-leading two-year full service and parts warranty.

Key Features

• Adjustable gibs throughout for precise fit and reduced play across all axes
• Heavy duty splined motor drive 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 smooth travel and extended wear resistance
• One-shot lubrication system for fast, consistent way and screw lubrication
• Precision hardened and ground ways and table ensure long-term accuracy and surface integrity
• Spindle head is internally cooled to maintain consistent operating temperatures during extended use
• Tolerance test sheet included to verify machine accuracy right out of the crate
• Certified Meehanite casting process provides a rigid, vibration-dampening machine structure
• Precision bored and honed milling head for quality, repeatable cuts
• Three-stage power downfeed with automatic stop for controlled, hands-free quill advancement
• Variable spindle speed range from 60 to 4,200 RPM for broad material and tooling compatibility
• ACU-RITE 203 DRO with 3-Axis (Knee) digital readout for precise positional awareness
• X-Axis powerfeed for automated longitudinal table travel
• Available in single or three phase power configurations
• R-8 spindle taper for wide tooling availability and easy tool changes

Specifications

• Stock Number: 690408
• Country of Origin: Taiwan
• 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: 3 (Knee)
• Powerfeed: X-Axis
• Overall Dimensions (L x W x H) (In.): 66 x 63 x 85
• Prop 65: Cancer and Reproductive Harm

What's Included

• JET JTM-4VS Variable Speed Milling Machine
• ACU-RITE 203 3-Axis DRO (Knee)
• X-Axis Powerfeed
• Tolerance test sheet

Frequently Asked Questions

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

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 to 7/8 inch, giving you broad compatibility with end mills, drill chucks, boring heads, and other common tooling.

What is the spindle speed range, and is it continuously variable?

Yes - the JTM-4VS is a variable speed mill with a spindle speed range of 60 to 4,200 RPM. This wide range allows operators to dial in the correct cutting speed for a variety of materials and tooling diameters without the need to change belt positions.

Does this mill include a coolant pump?

The machine features 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 purchased separately.

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 ways and lead screws with a single pump action. This simplifies routine maintenance, helps ensure the ways stay properly lubricated, and contributes to the long-term precision and service life of the machine's precision hardened and ground ways and table.