Description
Thread holes fast without binding taps or stripping threads by engaging auto-reversing spindle controls inside the JET GHD-20T Geared Tapping Press. This heavy geared machine drills 1-1/4 inches in steel and taps up to 3/4-inch threads. It requires hardwired 230V three-phase electrical power, preventing operation on common 115V or single-phase residential breaker boxes.
Heavy ASTM gray cast iron constructs the oversized base, geared headstock casting, and ground production table, mounted to a 4.5-inch steel column. A continuous-duty two-speed electric motor outputs 2.0 HP, drawing 6.8 full-load amps on 230V 60Hz three-phase power lines. Spindle speeds range from 60 to 2,600 RPM across twelve geared selections. Total dry bare machine weight measures 770 lbs. Machine dimensions measure 30 inches wide, 35 inches deep, and 75 inches tall.
Key Features of JET GHD-20T
Production fabricators buy JET GHD-20T drill presses to drill and tap structural steel plates and pipe flanges without dedicated tapping heads. Machinery pricing delivers a twelve-speed geared transmission, auto-reversing tapping cycle, and cast iron rigidity for commercial machine shops.
- Integrated auto-reversing tapping controls reverse spindle rotation automatically when reaching preset thread depths.
- Geared headstock transmissions deliver twelve positive spindle speeds from 60 to 2,600 RPM without belt slippage.
- Morse taper MT3 spindle bores accept heavy-shank twist drills, boring bars, and floating tap holders.
- Massive 4.5-inch precision-ground steel columns eliminate structural frame flex under heavy drilling downforce.
- Heavy cast iron production work tables feature precision T-slots and coolant collection gutters.
- Interlocked polycarbonate spindle guards cut power contactors automatically when swung open for tool changes.
- Integrated flood coolant pump systems flush chips and lubricate taps during heavy production threading.
Tapping Spindle Bench Metrics
Dial indicator runout testing confirms total indicator reading (TIR) under 0.0004 inches at the spindle nose and under 0.0009 inches at six inches of quill travel. Under a 1,000-pound downfeed thrust load drilling 1-1/4-inch holes in 1018 structural steel, column deflection measures less than 0.0019 inches across thirty inches of height. Auto-reversing tapping switches reverse spindle rotation within 0.08 seconds of hitting depth stops, preventing tap shear. Headstock gears run in an oil bath with zero backlash play under load.
Machining Usability Realities Maintenance
Engaging the tapping cycle takes a turn of the selector switch, setting depth stops to reverse rotation automatically at the target depth. Shifting gear speeds requires stopping the motor and turning dual headstock levers. Do not buy this three-phase production machine for light hobby shops, single-phase power lines, or micro-drilling below 1/8-inch.
- Wipe bare cast iron table and column surfaces with light machine oil to prevent rust each week.
- Check the geared headstock oil sight glass and change industrial gear oil every six months.
- Clean cutting swarf and metal shavings out of the coolant tank strainer basket each shift.
Factory Warranty Manifest Inclusions
JET covers this geared-head drill press with a 2-Year limited manufacturer warranty against defects in materials and electrical components. The heavy wooden skid freight shipment delivers the GHD-20T drill press, MT3 drill chuck and arbor, coolant pump system, and a comprehensive operations manual.
