28
28
Excessive feed rate for size of
drill and material being drilled.
No cutting fluid or improper
cutting fluid.
Reduce feed pressure or use cutting fluid.
Use correct cutting fluid.
Poorly drilled
holes.
Drill dull.
Sharpen drill.
Lack of rigidity in hold-down
method.
Check that all T-slot hold-downs are tight,
and that table-lock and drill head bolts are
tight.
Speed too fast for material and
drill size.
Check spindle speed recommendations.
Reduce speed if necessary.
Feed too fast for material and
drill size.
Reduce feed rate.
No or improper cutting fluid or
coolant being used.
Use cutting fluid or change to proper fluid
or coolant for material being drilled.
Improperly ground drill bit.
Check for proper angles and reliefs.
Regrind to proper geometry.
Motor
overheating.
Electrical circuit fault.
Check current draw in circuit. Make sure
current draw is the same as rating on
motor plate.
Oversize drill.
Reduce drill size.
No cutting fluid, or wrong fluid.
Use correct cutting fluid for the material
and drill.
No cutting fluid, or wrong fluid.
Use correct cutting fluid for the material
and drill.
Table cannot
be raised.
Lack of lubrication.
Lubricate.
