18
(c) Noisy spindle. – Lubricate spindle.
(d) Noisy motor. – Check motor bearings or for loose motor fan.
(12) Drill or Tool heats up or burns work:
(a) Excessive speed. – Reduce speed.
(b) Chips not clearing. – Use pecking operation to clear chips.
(c) Dull tool. – Sharpen tool or replace.
(d) Feed rate too slow. – Increase feed enough to clear chips.
(e) Rotation of frill incorrect. – Reverse motor rotation.
(f) Failure to use cutting oil or coolant (on steel). – Use cutting oil or coolant on steel.
(13) Drill leads off:
(a) No drill spot. – Center punch or center drill work-piece.
(b) Cutting lips on drill off center. – Regrind drill.
(c) Quill loose in head. – Tighten quill.
(d) Bearing play. – Check bearings and reseat or replace if necessary.
(14) Excessive drill run-out or wobble:
(a) Bent drill. – Replace drill. Do not attempt to straighten.
(b) Bearing play. – Replace or reseat bearings.
(c) Drill not seated properly in chucks. – Loosen, reseat and tighten chuck.
(15) Work or fixture comes loose or spins:
Failure to clamp work-piece or work holding device to table. – Clamp work-piece or work holding
device to table surface.
To Next Page
Loading...