JET JTM-4VS Mill with X-Axis Powerfeed is a professional-grade vertical milling machine from JET, engineered for precision metalworking, toolroom operations, and production milling applications. Built on a Certified Meehanite casting process, this variable speed R-8 spindle mill delivers consistent, reliable performance with a precision bored and honed milling head, three-stage power downfeed with automatic stop, and an X-Axis powerfeed - all backed by JET's industry-leading two-year full service and parts warranty.

Key Features

• Adjustable gibs throughout for precise, repeatable axis control and reduced play
• Heavy duty splined motor drive for reliable power transmission under demanding cutting loads
• Internal coolant tank built into casting base for use with coolant system (coolant pump not included)
• Large diameter quill is chromed for enhanced wear resistance and smooth travel
• One shot lubrication system keeps critical wear surfaces properly oiled with minimal effort
• Precision hardened and ground ways and table ensure accurate, long-lasting performance
• Spindle head is internally cooled to maintain stable operating temperatures during extended use
• Tolerance test sheet included for verified out-of-box accuracy documentation
• Certified Meehanite casting process provides a rigid, vibration-dampening machine structure
• Precision bored and honed milling head delivers quality, consistent cuts
• Three-stage power downfeed with automatic stop simplifies repetitive drilling and boring operations
• Available in single or three phase power configurations
• X-Axis powerfeed for smooth, consistent longitudinal table movement

Specifications

• Stock Number: 690183
• MPN: JT9-690183
• 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
• Max Distance Spindle to Table (In.): 17-1/2
• Distance Spindle to Column (Max.) (In.): 19
• 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

• Tolerance test sheet for verified accuracy documentation

Frequently Asked Questions

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

The JET JTM-4VS uses an R-8 spindle taper, which is a widely used standard in Bridgeport-style vertical mills, providing broad compatibility with R-8 collets, end mill holders, drill chucks, and other tooling. The collet capacity ranges from 1/8 to 7/8 inch.

What are the available quill down feed rates on this mill?

The JTM-4VS offers three-stage power downfeed rates of .0015, .003, and .006 inches per revolution (IPR), with an automatic stop feature to support precise and repeatable drilling and boring operations.

Does this mill include a coolant pump?

The JTM-4VS 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 would need to be sourced separately.

What is the spindle speed range on the JET JTM-4VS, and how is lubrication managed?

The variable speed spindle on the JTM-4VS covers a wide range of 60 to 4,200 RPM, making it suitable for a broad variety of milling, drilling, and boring tasks across different materials. The machine is equipped with a one shot lubrication system that efficiently lubricates critical wear surfaces throughout the machine with a single action.