1. Magnetic base not holding securely
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Material is too thin to engage magnet.
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Surface of material being drilled must be free of chips, debris, rust and mill scale.
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Does size of cutter exceed machine’s rated capacity?
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Excessive downfeed pressure.
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Check magnet face for unevenness, nicks and burrs.
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Is welding equipment connected to material being drilled?
2. Drill motor running, arbor and spindle not turning
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Possible sheared spindle key.
3. Motor slows when drilling
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Is an extension cord being used? If so, see page 6 for recommended wire gages and cord lengths.
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Excessive downfeed pressure during drilling cycle will cause motor to slow and overheat.
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Does cutting tool need to be resharpened?
4. Slugs not ejecting from cutter
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Lack of coolant causing slugs to expand in cutter bore.
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Is correct pilot pin being used?
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Possible broken internal arbor parts.
5. Breaking cutters
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How is coolant being applied? Coolant must be supplied to interior of cutter.
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Excessive feed pressure being applied when cutter initially contacts work surface.
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Confirm material hardness.
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Drilling stacked materials with incorrect cutter.
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Dull cutters; dull or chipped cutting edges require excessive feed pressure, resulting in breakage.
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Excessive arbor runout –see regular maintenance on page 10.
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Possible bent motor spindle or worn arbor sleeve.
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Improperly adjusted motor slide –see page 10.
6. Oversized or rough holes
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Insufficient coolant.
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Excessive feed pressure.
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Excessive cutter runout.
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Dull cutter.
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Worn support bracket roller bearing or arbor body sleeve.
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Bent motor spindle.
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Motor slide improperly adjusted.
basic troubleshooting
9
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