Spindle Brake, High-Neutral-Low Shift Lever

Spindle Brake

The spindle brake lever is located on the upper left side of the mill head (Figure 8). Pull lever downward to apply the brake. The spindle brake lever is used only after the motor switch has been set to OFF. The spindle will not stop with the motor running.

Do not move the Quill Power Feed Lever unless the motor is at a complete stop. When changing the lever

position, do it gently. If the gear does not engage, jog the motor and allow it to stop before attempting to change.

The quill power feed lever is located on the right side of the mill head (Figure 10). It is used to engage and disengage the quill power feed mechanism.

The power feed is engaged by pulling out the knob and rotating the handle to a new locked position. When engaged, the power feed mechanism will drive the spindle upward or downward. The power feed mechanism will not drive the spindle when the handle is in the disengage position.

Figure 8

High-Neutral-Low Shift Lever

The mill head can be driven directly (High Speed) or through the back gear (Low Speed) in the mill head. The selection is made by changing the position of the shift lever.

The shift lever is located at the lower right side of the mill head (Figure 9). The lever position closest to the operator is the High setting. The lever position away from the operator is the Low setting. The middle position is the Neutral setting.

Do not shift the High-Low Gear Lever while the motor is running. Rotate the spindle by hand to facilitate

changing lever positions.

Figure 10

Feed Rate Lever

The Feed Rate Lever (Figure 11) is used to set the per-revolution rate of the power feed mechanism. Three feed rates are available: 0.0015-inch, 0.003- inch, and 0.006-inch per revolution. The positions are shown on an indicator plate under the feed rate lever.

The rate is selected by pulling out the knob on the feed rate lever and moving the handle to the detent of the desired feed rate.

Note: The knob is spring loaded – pull out to rotate to new position.

Unlike other controls on the machine, the lever shifts into engagement more easily with the motor running, and the quill feed lever engaged.

Figure 9

Quill Power Feed Lever

Do not use power feed at speeds above 3000 R.P.M.

It is recommended to disengage the power feed worm gear whenever the power feed is not required. This

avoids unnecessary wear on the worm gear.

Figure 11

JTM-4VS specifications

The Jet Tools JTM-4VS is a highly regarded vertical mill that caters to the demands of both professional machinists and serious hobbyists. This versatile piece of machinery combines precision engineering with innovative features, making it a popular choice in workshops and fabrication shops.

One of the standout characteristics of the JTM-4VS is its powerful 1.5 HP motor that operates on either 115V or 230V power supply, providing flexibility depending on the workshop setup. The motor offers variable speed control, from 60 to 4200 RPM, allowing users to adjust speeds according to the material being machined. This capability makes it ideal for a wide range of applications, from heavy milling on steel to delicate work on softer materials like aluminum.

The JTM-4VS is equipped with a robust cast iron column and base, which contribute to its stability and durability. This construction minimizes vibrations during operation, resulting in improved precision and surface finish on machined parts. The table measures 9” x 49”, providing ample workspace for various projects, and is fitted with T-slots for easy clamping of workpieces.

Another notable feature of the JTM-4VS is its easy-to-use digital readout (DRO) system that assists users in making precise adjustments and measurements. The DRO enhances the overall efficiency of the milling process, allowing operators to focus on the task at hand rather than relying solely on manual measurements.

The machine also incorporates a high-grade, hardened and ground bedway that ensures smooth operation and long-lasting performance. This feature not only extends the longevity of the mill but also allows for precise vertical and horizontal movements.

Safety is a primary concern in any workshop, and Jet has addressed this with various safety features integrated into the JTM-4VS. The mill is designed with a protective shield and emergency stop button, ensuring operators can work confidently.

In summary, the Jet Tools JTM-4VS stands out for its combination of robust construction, versatile functionality, and user-friendly technologies. With its powerful motor, variable speed capabilities, and precision features, it is an excellent investment for anyone looking to enhance their machining capabilities in the workshop. Whether it's for industrial applications or intricate projects, the JTM-4VS delivers reliable performance and exceptional results.