Description
Bore commercial mower spindle pockets, mill deck mounting keyways, and drill implement brackets without drive belt slippage. The JET Variable Speed Geared Head square column mill drill combines geared torque with electronic inverter speed control. This rigid mill drill uses power downfeed. It requires solid concrete anchoring to eliminate machine vibration under heavy cuts.
Solid cast-iron forms the square column upright and base, stopping spindle head deflection during heavy end-milling operations. A 1.5 HP motor links with an electronic inverter and hardened reduction gears, delivering variable spindle speeds from 65 to 2000 RPM. Automated quill downfeed drives tools at three feed rates per spindle revolution. The square column geometry prevents head rotation when elevating the headstock, keeping your hole coordinates locked on location.
Key Features of JET JT9-351051
Machinists use this geared-head mill drill to bore commercial spindle housings and mill replacement tractor keyways. The electronic inverter adjusts RPM with a single dial turn.
- 1.5 HP electric motor with electronic inverter delivers variable spindle speeds across 65 to 2000 RPM
- Square column design prevents head rotation during elevation adjustments to hold coordinate position
- Three-speed automated power downfeed advances the quill under controlled drilling thrust
- R8 spindle taper accepts standard industrial collets, end mill holders, and boring heads
- Precision ground cast-iron worktable features three 5/8-inch T-slots for rigid vise mounting
- Digital spindle tachometer displays live RPM to maintain proper surface speeds for cutter life
- Reversible spindle rotation permits thread tapping operations up to 3/4-inch diameter
Geared Spindle Dyno Performance Telemetry
Dynamometer testing confirms 14.8 foot-pounds of torque at 120 RPM under full chip load in 4140 steel. Spindle radial runout measures under 0.0004 inches at the spindle taper face. Downfeed thrust reaches 850 lbs under automated power downfeed in alloy steel. Motor current draw measures 7.4 amps on 230V single-phase power under full cut depth. Acoustic sound output measures 74 dBA during cutting.
Machining Bay Setup Safety Boundaries
Bolt the machine base tabs securely to a concrete floor foundation before starting heavy milling passes. Lock table axis clamps on idle axes before engaging heavy cuts to eliminate table deflection. Never touch the rotating spindle or attempt to clear chips with bare hands; use a chip brush.
- Geared spindle head requires ISO 68 industrial gear oil changes every 1000 hours
- Quill feed rack and square column ways demand daily lubrication with ISO 68 way oil
- Electronic inverter cooling fan shroud requires compressed air cleaning monthly
JET Geared Mill Drill Warranty
JET covers this geared-head mill drill with a 2-Year commercial warranty covering mechanical gearing and electronic controls. The package includes the mill drill, power downfeed, digital tachometer, drawbar, and user manual.
