Positioning the Ram

Positioning the Ram Fore and Aft

1.Loosen the two bolts (A, Figure 23) that lock the ram to its ways.

Figure 23

2.Turn the lever (B, Figure 23) to move the ram on its ways.

3.When the desired position is reached, lock the bolts (A, Figure 23) securely.

Positioning the Ram on its Turret

Make sure the machine base is secured to the floor before repositioning the ram. The center of gravity can shift enough to cause the machine to tip over, resulting in serious injury to the operator and damage to the machine.

1.Loosen four turret lock bolts (C, Figure 23) that clamp the ram to the top of the base. 1/2 turn should be sufficient to allow the turret to move.

Note: Use gentle hand pressure to avoid rapid movement.

2.Turn the ram until the spindle is in the desired position. Use the scale on the turret for degree measurement.

3.Tighten the four turret lock bolts (C. Figure 23).

Figure 24

Adjustment of Knee Gib

The knee gib adjustment screw (A, Figure 24) is located under the chip wiper at the rear of the knee where it contacts the column. Remove the way cover and the wiper to expose the gib adjustment screw. Tighten the screw until a slight drag is felt when turning the knee crank.

Adjustment of Saddle Gib

The saddle gib adjustment screw is on the left front of the saddle (B, Figure 24). Tighten the screw until a slight drag is felt when turning the cross-feed crank.

Adjustment of Table Gib

The table gib adjustment screw (C, Figure 24) is on the left-hand side, beneath the table. Tighten the screw until a slight drag is felt when turning the longitudinal table cranks.

Gib Adjustment

The table, saddle and knee are equipped with adjustable gibs. The gibs may require adjustment if unusual vibration is noted when the locking mechanisms are off, or if you experience unusual vibration when spindle speed, tooth pitch or depth of cut do not account for the vibration.

NOTE: When adjusting gibs, always start with the knee first; adjust the saddle second, and adjust the table last.

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Jet Tools JTM-4VS operating instructions Positioning the Ram, Gib Adjustment
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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.
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