Description
Need to bore massive four-inch holes through thick structural I-beams in the field without hauling parts to a machine shop? The Champion AC120 Magnetic Drill Press clamps onto steel girders to drive annular cutters up to four inches wide. It requires clean steel contact, losing magnetic clamping grip on rusted, painted, or thin steel under 3/8-inch.
High-strength cast aluminum alloy constructs the drill housing and slide carriage, mounted to an oversized electromagnetic base plate. An industrial four-speed electric motor draws 15 full-load amps on standard 120V 60Hz single-phase wall power, developing 1,800 watts across four mechanical gear ranges from 100 to 500 RPM. Total dry bare machine weight measures 58 lbs. Dimensions measure 14 inches long, 10 inches wide, and 24 inches tall.
Key Features of Champion AC120
Steel fabricators buy Champion AC120 magnetic drills to bore large holes in bridge girders and building columns on site. Equipment pricing delivers four gear speeds, high magnetic adhesion, and four-inch cutter capacity for steel erectors.
- Four mechanical gear speeds from 100 to 500 RPM match large annular cutters, twist drills, and bridge reamers.
- High-density electromagnetic bases generate 4,500 lbs of holding force to prevent drill slip under heavy torque.
- Industry-standard 1-1/4-inch Weldon shank arbors accept large commercial annular cutters up to four-inch diameters.
- Internal gravity-fed coolant systems deliver cutting lubricant straight through the center of annular cutters.
- Four-inch cutter capacity drills through thick structural steel flange plates in a single forward pass.
- Reversible feed handles allow operator placement on either side for tight structural steel web clearance.
- Integrated electronic overload protection modules cut motor power automatically before motor coils suffer thermal damage.
Magnetic Adhesion Bench Load Metrics
Pull-off bench testing on one-inch Blanchard-ground carbon steel plate confirms the electromagnet developing 4,520 lbs of direct vertical holding force. Spindle runout measures under 0.0008 inches TIR at the cutter arbor face. Under full four-inch annular cutting load through two-inch A36 steel, the four-speed gearbox transfers 185 foot-pounds of rotational torque without gear slipping. The 1,800-watt motor draws 14.6 running amps on 120V lines under peak chip load. The internal through-spindle coolant valve delivers continuous cutting fluid flow under gravity feed.
Field Rigging Usability Realities Maintenance
Hoisting this 58 lb magnetic drill onto vertical bridge steel requires two hands and a safety strap wrapped around beams. The magnetic switch energizes with positive LED confirmation. Do not buy this magnetic drill for non-ferrous aluminum, stainless steel without clamping plates, or thin sheet metal under 3/8-inch thickness.
- Scrape steel chips, cutting fluid, and rust scale off the magnetic base plate after each shift.
- Inspect the slide carriage dovetail ways and adjust brass gib screws for snug fit each month.
- Check through-spindle coolant seal O-rings for weeping leaks every two weeks of heavy drilling.
Factory Warranty Manifest Inclusions
Champion covers this large-capacity magnetic drill press with a 1-Year limited manufacturer warranty against defects in materials and electrical components. The heavy blow-molded carrying case delivers the AC120 magnetic drill, coolant bottle assembly, safety strap, hex keys, and an illustrated operations manual.