JET JTM-4VS Variable Speed Vertical Milling Machine 230/460V 3Ph by JET is a professional-grade vertical knee mill engineered for precision metalworking, toolroom operations, and production milling. Built on a Certified Meehanite casting foundation, this machine delivers consistent, reliable cutting performance across a wide spindle speed range, backed by a three-stage power downfeed with automatic stop and a robust 3 HP motor for demanding shop environments.

Key Features

• Constructed using the Certified Meehanite casting process for consistent and reliable operation
• Precision bored and honed milling head ensures quality cuts on every pass
• Three-stage power downfeed with automatic stop for controlled, repeatable drilling and boring operations
• Adjustable gibs throughout for precise fit and long-term accuracy
• Heavy duty splined motor drive for smooth, reliable 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 travel
• One shot lubrication system for easy, consistent machine maintenance
• Precision hardened and ground ways and table for long-lasting accuracy and surface quality
• Spindle head is internally cooled to maintain performance during extended operation
• Tolerance test sheet included for verified out-of-box accuracy
• Variable speed spindle ranging from 60 to 4,200 RPM for versatility across materials and operations
• Available in single or three phase power configurations
• Backed by the industry-leading two-year full service and parts warranty

Specifications

• MPN: JT9-690182
• Stock Number: 690182
• 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
• Travel of Knee (In.): 14-1/2
• 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

• Tolerance test sheet for verified out-of-box machine accuracy

Frequently Asked Questions

What is the spindle speed range on the JET JTM-4VS, and what does variable speed operation mean for milling work?

The JTM-4VS offers a spindle speed range of 60 to 4,200 RPM. Variable speed operation allows the operator to dial in the optimal cutting speed for different materials and tooling without changing belt positions, improving efficiency and surface finish quality across a wide variety of milling, drilling, and boring applications.

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 common standards in knee mill tooling. It accepts collets ranging from 1/8 to 7/8 inch, providing broad compatibility with end mills, drill chucks, boring heads, and other standard R-8 tooling.

Does the JET JTM-4VS include a coolant pump?

The machine features an internal coolant tank built directly into the casting base, designed for use with a coolant system. However, the coolant pump is not included and must be sourced separately if coolant delivery is required for your application.

How is machine accuracy verified on the JET JTM-4VS?

Each JET JTM-4VS includes a tolerance test sheet, which documents the machine's measured accuracy at the time of manufacture. This provides confidence in out-of-box precision and serves as a baseline reference for ongoing maintenance and calibration.