Section H GRADE A Q&A
Assuming that a drill press operator has selected the proper tool, assured his own
safety and adequately clamped his workpiece, what other considerations should he
make before starting his drill press? - (correct answer)Set up the correct SPEED and
FEED; select a CUTTING FLUID
If drilling speed is too high for the diameter of the drill and for the material being drilled,
the result is - (correct answer)The margins or outer corner are broken down
Which of the following is the correct RPM of drilling a 1 inch diameter hole in SAE 4140
is CS were 50 SFPM? - (correct answer)160
if the drilling speed is too low for the diameter of the drill and the material being drilled: -
(correct answer)More feed is required to get the drill to cut thus breaking the drill
When using a sensitive drill press, you can tell if the feed is approximately right in soft
steel if the: - (correct answer)Chip is a tightly rolled helix
Which of the following could be an acceptable fee for a 1/2 inch diameter drill in low
carbon steel/ - (correct answer)0.006 inch per revolution
Coolants may be divided into two groups: the mineral and animal oils and the: - (correct
answer)Water soluble oils
Which cutting fluid would be best for reaming or tapping low carbon steel? - (correct
answer)Sulfurized cutting oil
Jamming of drills, when drilling deep holes, can be avoided by using a procedure called:
- (correct answer)PECKING
Assuming that a drill press operator has selected the proper tool, assured his own
safety and adequately clamped his workpiece, what other considerations should he
make before starting his drill press? - (correct answer)Set up the correct SPEED and
FEED; select a CUTTING FLUID
If drilling speed is too high for the diameter of the drill and for the material being drilled,
the result is - (correct answer)The margins or outer corner are broken down
Which of the following is the correct RPM of drilling a 1 inch diameter hole in SAE 4140
is CS were 50 SFPM? - (correct answer)160
if the drilling speed is too low for the diameter of the drill and the material being drilled: -
(correct answer)More feed is required to get the drill to cut thus breaking the drill
When using a sensitive drill press, you can tell if the feed is approximately right in soft
steel if the: - (correct answer)Chip is a tightly rolled helix
Which of the following could be an acceptable fee for a 1/2 inch diameter drill in low
carbon steel/ - (correct answer)0.006 inch per revolution
Coolants may be divided into two groups: the mineral and animal oils and the: - (correct
answer)Water soluble oils
Which cutting fluid would be best for reaming or tapping low carbon steel? - (correct
answer)Sulfurized cutting oil
Jamming of drills, when drilling deep holes, can be avoided by using a procedure called:
- (correct answer)PECKING
