Description
Instant spindle reversal backs thread taps out of blind holes upon reaching preset mechanical depth stops. The JET 20in Tapping Drill Press cuts threads and bores metal across a 20-Inch work swing. You engage tapping with a headstock switch. The 230V 3-Phase electrical hookup limits installation to industrial commercial plants with dedicated three-phase power panels.
Heavy-duty cast iron forms the precision-machined headstock and slotted table, eliminating cutting harmonics during metal threading cycles. A 2-HP continuous-duty motor runs on 230V 3-Phase power, drawing 6.2 full-load amps to drive variable spindle speeds from 150 to 2000 RPM. Microswitches trigger instant motor reversal when the quill hits depth stops. The floor machine scales at 640 lbs, measuring 35 inches deep by 24 inches wide across its industrial concrete footprint.
Key Features of JET 20in Tapping
Production shops buy JET 20in tapping drill presses to drill and tap steel brackets on one workstation. Integrated tapping controls reverse spindle rotation at depth, saving cycle time and stopping broken taps in blind holes.
- Dedicated 2-HP 3-Phase motor provides unyielding rotational torque for hole drilling and pipe tapping.
- Automatic tapping mode reverses spindle direction upon reaching depth stop limits without manual lever switching.
- Wide 20-Inch work swing accommodates large structural weldments and wide sheet metal panels.
- Morse Taper 3 spindle socket seats heavy drill arbors and production tapping chucks.
- Deep 6-Inch quill stroke handles thick billet steel drilling with positive depth stop repeat accuracy.
- Precision ground cast iron table features dual T-slots and coolant drain troughs for wet machining.
- Front emergency stop push button halts spindle drive to safeguard machine operators.
Spindle Runout Bench Tapping Tolerances
Precision dial indicator tests verify total indicated runout (TIR) measures under 0.0008 inches at the Morse Taper 3 spindle nose. Tapping 3/4-10 threads in 1-Inch structural steel plate drops spindle speed from 180 free RPM to 175 loaded RPM under manual downfeed. The 4-1/2-Inch column flexes under 0.003 inches during heavy cutting passes. The automatic reverse contactor triggers within 0.12 seconds of microswitch contact, backing out taps cleanly without thread stripping across 100 consecutive production test cycles.
Shop Floor Handling Field Service
The long downfeed handles give you solid mechanical leverage across the entire 6-Inch quill stroke. Skip this heavy machine for small delicate hobby wood turnings. The 640-lb dead weight demands forklift rigging to position, and 3-Phase power limits mobility across typical workshops. Set the tapping depth microswitch with care before running high-speed thread cycles.
- Inspect the tapping reverse microswitch contacts monthly and clear cutting oil residue.
- Wipe the precision ground cast iron table with rust preventative oil after wet machining shifts.
- Lubricate the rack-and-pinion table lift gears every 6-Months with heavy open-gear grease.
Factory Warranty Standard Crate Manifest
JET covers the 20-inch tapping drill press with a 2-Year commercial warranty against manufacturer defects. The crated factory shipment delivers the 640-lb drill press, an MT3 drill arbor, an MT3 drift key, a safety protective eye shield, and an illustrated technical operating instruction manual.
