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Jet Geared Head Square Column Mill Drill with Power Downfeed
- $3,025.00
- Brands JET
- Product Code: 351046
- Availability: In Stock
JET Geared Head Square Column Mill/Drill with Power Downfeed Product Overview The JET Geared Head Square Column Mill/Drill with Power Downfeed is a heavy-duty machine designed to handle both milling and drilling operations in professional metalworking environments. Its rigid square-column construction provides a stable machining platform, while the geared head delivers direct mechanical power fo..
Features of Jet Geared Head Square Column Mill Drill
JET Geared Head Square Column Mill/Drill with Power Downfeed
Product Overview
The JET Geared Head Square Column Mill/Drill with Power Downfeed is a heavy-duty machine designed to handle both milling and drilling operations in professional metalworking environments. Its rigid square-column construction provides a stable machining platform, while the geared head delivers direct mechanical power for demanding cutting applications.
A built-in power downfeed provides controlled, repeatable quill movement, making the machine particularly useful for drilling, boring, and repetitive machining tasks. The adjustable milling head and R8 spindle further expand its versatility for general machine-shop work.
Key Features
- Heavy-duty square-column design with rigid construction.
- Geared-head drive provides strong mechanical power at the spindle.
- Power downfeed allows controlled and repeatable quill movement.
- R8 spindle taper accommodates a wide selection of milling accessories.
- Head tilts 90° left and right for angled machining.
- Six-speed geared head for selecting appropriate spindle speeds.
- Large cast-iron worktable provides a stable surface for workholding.
- Suitable for drilling, milling, boring, slotting, and general machining.
- 1.5 HP motor provides power for a broad range of metalworking applications.
- Available in a 115/230V, single-phase electrical configuration.
Technical Specifications
| Specification | Details |
|---|---|
| Brand | JET |
| Product Type | Geared-head square-column mill/drill |
| Product Series | JMD-45GHPF |
| Drilling Capacity | 1-1/2 in. |
| Face Mill Capacity | 4 in. |
| End Mill Capacity | 3/4 in. |
| Swing | 19-11/16 in. |
| Spindle Taper | R8 |
| Spindle Travel | 5 in. |
| Automatic Spindle Travel | 4-1/4 in. |
| Quill Diameter | 3 in. |
| Column Size | 7-7/8 x 7-5/8 in. |
| Number of Spindle Speeds | 6 |
| Table Size | 9-1/2 x 32-1/4 in. |
| Longitudinal Table Travel | 20-1/2 in. |
| Cross Table Travel | 8-1/4 in. |
| Head Tilt | 90° Left / 90° Right |
| Motor Power | 1.5 HP |
| Voltage | 115/230V |
| Phase | 1 Phase |
| Drive Type | Geared head |
| Primary Applications | Milling, drilling, boring, machining |
Exact spindle-speed range, overall dimensions, machine weight, feed rates, and included accessories may vary by JET configuration. Verify the current manufacturer's specification sheet for the exact stock number before purchase.
Geared-Head Drive
The machine uses a geared head rather than relying solely on a belt-drive transmission. Mechanical gearing transfers motor power directly to the spindle, providing the torque needed for heavier milling and drilling operations.
The six-speed configuration allows the operator to select a suitable spindle speed based on the material, cutter diameter, cutting depth, and machining operation.
This makes the machine useful for both routine drilling and more demanding milling applications.
Power Downfeed
The integrated power downfeed provides automatic quill movement at a controlled rate.
This feature is particularly valuable for:
- Repetitive drilling
- Boring
- Counterboring
- Controlled-depth machining
- Production work
- Consistent hole-making
Power feed can reduce operator fatigue and provide more consistent results than manually feeding the quill throughout a long machining cycle.
A manual fine-feed mechanism can also be used when the operator needs more precise control over spindle movement.
Square Column Construction
The square-column design provides a rigid foundation for the head and spindle assembly. Dovetail-style guiding surfaces help maintain controlled movement and support accurate positioning.
The rigid structure is beneficial when performing operations that generate higher cutting forces, such as:
- Face milling
- End milling
- Slotting
- Boring
- Large-hole drilling
- Heavy stock removal
Proper workholding and conservative cutting parameters remain essential for achieving the best results.
R8 Spindle
An R8 spindle taper provides compatibility with a broad range of commonly available milling tooling.
Depending on the operation, the spindle can accommodate appropriate:
- End mills
- Collets
- Drill chucks
- Boring tools
- Face mills
- Other R8-compatible accessories
The published capacity is approximately 3/4 inch for end mills and 4 inches for face mills.
Actual capacity depends on material hardness, tooling, spindle speed, feed rate, depth of cut, and machine setup.
Milling and Drilling Capacity
The JET mill/drill is designed to perform both conventional milling and drilling operations.
Milling Applications
- Face milling
- End milling
- Slot cutting
- Keyway work
- Pocketing
- Edge machining
- General material removal
Drilling Applications
- Through holes
- Blind holes
- Counterbores
- Enlarging existing holes
- Repetitive hole production
The published 1-1/2-inch drilling capacity gives the machine useful capability for larger-hole work when the appropriate tooling and cutting conditions are used.
Tilting Head
The head can tilt 90° to the left and 90° to the right, allowing the spindle to be positioned for angled machining.
This capability can be useful for:
- Angled holes
- Beveled surfaces
- Angular milling
- Specialized machining setups
- Compound machining operations
When using the tilted-head function, verify that the head is securely locked before beginning the cut.
Worktable
The machine features a 9-1/2 x 32-1/4-inch table, providing a substantial working surface for fixtures, vises, and workpieces.
Published specifications list approximately:
- 20-1/2 inches of longitudinal travel
- 8-1/4 inches of cross travel
This travel range gives the operator considerable flexibility when positioning a workpiece under the spindle.
For accurate machining, workpieces should be securely clamped using an appropriate vise, fixture, or table-mounted workholding system.
1.5 HP Motor
The 1.5 HP single-phase motor provides the power required for general milling and drilling applications.
The 115/230V electrical configuration provides flexibility for installation in workshops equipped with compatible electrical service.
Electrical installation should follow JET's requirements and applicable local electrical codes. Confirm the machine's voltage configuration before connecting it to a power source.
Typical Applications
The JET Geared Head Square Column Mill/Drill is suitable for:
- Machine shops
- Fabrication shops
- Maintenance departments
- Repair facilities
- Tool rooms
- Prototype development
- Small-batch manufacturing
- Metalworking education
- General industrial machining
It is particularly useful for operations requiring more rigidity and milling capability than a conventional drill press can provide.
Benefits for Professional Users
Heavy-Duty Construction
The square-column design provides a rigid platform for demanding machining operations.
Geared-Head Power
Mechanical gearing provides strong spindle torque for milling and drilling.
Automatic Downfeed
Power downfeed improves consistency during repetitive drilling and boring.
R8 Tooling
The R8 spindle provides access to a wide range of standard milling accessories.
Tilting Head
The 90° left/right head adjustment expands the range of machining configurations.
Large Worktable
The 9-1/2 x 32-1/4-inch table provides useful space for workpieces and fixtures.
Recommended Setup Practices
For accurate machining, proper setup is essential.
Before starting work:
- Secure the machine firmly on an appropriate foundation or stand.
- Install the correct tooling for the operation.
- Secure the workpiece using an appropriate vise or fixture.
- Select a spindle speed suitable for the material and cutter.
- Set the required feed rate and depth of cut.
- Verify that the head and table are properly locked where required.
- Check tool clearance before starting the spindle.
For demanding cuts, use multiple passes rather than attempting to remove excessive material in a single operation.
Maintenance
Regular maintenance helps preserve machine accuracy and reliability.
Inspect:
- Spindle and bearings
- Gear head
- Quill
- Power-downfeed mechanism
- Column and ways
- Table
- Lead screws
- Tooling
- Electrical connections
- Lubrication points
Keep the table and machine ways clean and free from metal chips. Lubricate the machine according to JET's recommended maintenance schedule.
Do not allow chips or abrasive debris to accumulate around moving mechanisms.
Safety Considerations
Milling and drilling operations involve rotating tooling and potentially high cutting forces. Always wear appropriate eye protection and use additional PPE as required by the application.
Secure the workpiece firmly before machining. Never hold a workpiece by hand while drilling or milling.
Keep hands, loose clothing, jewelry, and hair away from the rotating spindle and cutter.
Do not attempt to adjust the workpiece, remove chips, or measure a part while the spindle is running.
Disconnect the machine from its electrical supply before changing tooling, performing maintenance, or accessing moving components.
Why Choose the JET Geared Head Square Column Mill/Drill?
The JET Geared Head Square Column Mill/Drill with Power Downfeed combines the capabilities of a substantial drill press and milling machine in a single platform.
Its rigid square column, geared-head transmission, 1.5 HP motor, R8 spindle, power downfeed, large worktable, and 90° head-tilting capability make it a versatile solution for professional users performing drilling, milling, boring, slotting, and general metalworking operations.