Depth Scale and Stop

Referring to Figure 15:

The Depth Scale and Stop are used in drilling operations to set the depth of the drilled hole. The depth scale is located on the front of the mill head. The scale consists of a Micrometer Adjusting Nut (A), Lock Nut (B), Quill Stop (C), Quill Stop Screw (D), and Scale (E).

The Micrometer Adjusting Nut is set to the desired dimension and locked in place using the Lock Nut. The quill stop provides a positive stop for quill travel.

The graduations on the micrometer nut are in 0.001-inch increments. Adjustment of quill travel is made by rotating the micrometer nut.

Figure 15

Power Feed Operation

The Feed Trip Adjustment sets the point at which the quill will reset during Power Feed.

Referring to Figure 17:

Be sure that the Manual Fine Feed Handwheel is removed.

Failure to comply may cause serious injury.

1.Loosen the Locknut (I).

2.With the Quill Feed Handle (J), advance the quill to the point where the feed should stop.

3.Engage the Feed Trip Cam Lever (D) by pulling away from head assembly.

4.Adjust Micrometer Adjusting Nut (H) against Quill Stop (G).

5.Continue turning the Micrometer Adjusting Nut

(H)until the Feed Trip Cam Lever (D) trips.

6.Tighten the Locknut (I).

7.Ensure Quill Lock (K) is disengaged by rotating counter-clockwise.

8.Start the spindle (A):

9.Select feed rate with the Variable Speed Control Handwheel (E).

10.Set the Feed Rate Lever (B) to the feed rate required for the tooling and material required.

11.Place the Quill Feed Engagement Lever (F) in the Engaged position.

12.Select feed direction by setting the Feed Direction Knob (C) position per the table:

Spindle Dir.

Feed Dir.

Knob Pos.

 

 

 

CW

Down

In

Up

Out

 

 

 

 

CCW

Down

Out

 

 

Up

In

 

 

Figure 16

 

 

 

13.Engage the Feed Trip Cam Lever (D) by pulling away from head assembly.

Note: Due to variables in tool diameter, coatings, coolant, and materials, no specific spindle speed or feed rate recommendations are provided. Use general shop manuals that have data applicable to the milling and drilling operations being performed. Or, contact the supplier of the tooling, coolant, and material for specific recommendations.

IMPORTANT: The power feed can be used for drills up to 3/8” in diameter (mild steel). Use manual feed for drills larger than 3/8”.

The overload clutch is factory set to hold up to 200 lbs. downfeed pressure on the quill (accommodates drills up to 3/8”). Do not attempt to adjust clutch pressure.

Figure 17

15

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Image 15
Jet Tools JTM-4VS operating instructions Depth Scale and Stop, Power Feed Operation, Ccw
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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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