Set-up and Installation

Preparing the Milling Machine for Service

1.Remove any crating which may be covering the machine on the pallet.

2.Remove accessory items from the pallet or machine table. Compare these items with the list on the previous page.

3.Check the tightness of the lifting ring on the ram to be certain it is tight.

4.Check the tightness of the lock handles on the ram (see Figure 23) to be certain the ram is locked tight.

5.Remove the nuts and/or bolts, which secure the machine to the pallet.

6.Center an overhead crane or other suitable overhead lifting device and sling arrangement over the lifting ring.

Note: This machine weighs over 2400 pounds! Be certain the lifting arrangement is new or in excellent condition and has a safety factor that will account for age, difficulties in lifting, etc. When lifting using the ring, the machine will tip forward. If you wish, you can minimize this tipping by rigging a support sling over the front of the machine. Be careful when doing this, to prevent the sling from damaging any components on the front of the machine. Be sure to steady the mill to prevent it from spinning.

7.Lift the machine off the pallet no higher than necessary to clear the hold-down hardware, then pull the pallet out of the way. Do NOT get hands or feet underneath the machine when removing the pallet!

8.Put the machine base over the hold-down system where the machine will be spotted. Anchor bolts of sufficient size and length must be fastened to the floor according to the footprint of the mill. See diagram on page 10.

Note: The accompanying diagrams show you the maximum dimensions of the machines with the table, ram, etc., fully extended in all possible directions. When spotting the machine be certain to leave room not only for the machine itself, but also for operator clearance and clearance for workers servicing the machine, and any unusual sizes of workpieces that might extend off the machine’s table.

9.When the machine is over its anchors, level the machine using shims under the corners needing them. The machinist’s level used for leveling should be placed on the table. The table is the reference surface for both side-to-side and fore-

and-aft leveling. Be certain you get it level in BOTH directions.

Mill must be supported equally under all four corners. Failure to comply may cause the column to twist and put a bind in the table ways.

10.When the machine is level, secure the base to the anchor system.

IMPORTANT: Before attempting to raise the mill head, refer to Mill Head – Left/Right Adjustment in the Adjustments section for procedures to safely raise and set up the mill head.

11.Loosen the four hex head nuts (see A, Figure 22) about 1/4 turn each (counterclockwise), just enough to allow rotation of the head.

12.While assisting the worm mechanism by putting upward pressure on the motor by hand, use the wrench supplied with the machine to turn the worm nut and raise the head to upright position.

13.Tighten the headbolts slightly — not torqued — just snug.

14.Using mineral spirits or other cleaning solvent, clean all of the rust proofing from where it may have been applied. This is important; moving the table or any other components before removing the rust proofing will only put rust proofing where you don’t want it.

Some of the following steps may have already been performed on the machine. If so, ignore the instructions related to those particular steps. Otherwise, perform them in the order listed, referring to Figure 11 for any clarification.

15.Install the table traverse and cross-feed cranks on their respective shafts using the nuts on the shafts to secure the cranks.

16.Remove any rust proofing from the drawbar and its washer, and put the drawbar with washer installed into the spindle center through the top of the machine.

17.Slide the fine feed handwheel over the handwheel hub and push it back until its rollpin engages the hole in the hub and the wheel is flush with the hub surface.

18.Put the coarse feed handle on the feed shaft and tap it lightly until its roll pin engages a hole in the hub and it is flush against the hub surface.

19.Unwrap and clean the knee crank and install it on its shaft.

20.Install the rubber way covers at front and behind the table.

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.