NIMS Drill Press

Which of the following included point angles are found on general-purpose twist drills? a) 118° b) 59° c) 130° d) 65°

a) 118°

Calculate the RPM for a .500 inch high speed steel twist drill cutting through 4140 steel with a cutting speed of 55 SFPM (use 4 as the constant): a) 440 RPM b) 110 RPM c) 220 RPM d) 880 RPM

a) 440 RPM

To drill brass or hard bronze, the machinist often grinds a small flat on the cutting lips of the drill. The flat on the cutting lip provides: a) A scraping action that prevents binding of the drill b) Positive rake to reduce tensile pressure on the cutting edge c) A method of having a new drill cut undersize d) Clearance to reduce the cutting pressure

a) A scraping action that prevents binding of the drill

Which one of the following material can be drilled or reamed without any lubrication (reference the Machinery's Handbook)? a) Cast iron b) Aluminum c) Stainless steel d) A2 tool steel e) Copper

a) Cast iron

Which of the following reamer(s) have a back taper (size reduction toward the shank)? a) Hand reamer b) Straight flute chucking reamer c) Carbide tipped chucking reamer d) Helical taper pin reamer

a) Hand reamer

Which one of the following drilling procedures is used to create an even surface for a socket head cap screw on a rough uneven surface? a) Spot facing b) Countersinking c) Center drilling d) Reaming e) Reverse drilling

a) Spot facing

Which type of tap will require the greatest amount of torque? a) Taper pipe tap b) Straight pipe tap c) Spiral fluted tap d) Straight hand tap

a) Taper pipe tap

Which of the following statements define the margin of a twist drill? a) The cylindrical portion of the land that is not cut away to provide clearance b) The edge at the ends of the web that connects the cutting lips c) The cutting edges extending from the chisel edge to the periphery of the twist drill d) The reduced diameter between the body and the shank of a drill

a) The cylindrical portion of the land that is not cut away to provide clearance

What is the danger of having loose clothing, long hair and dangling jewelry near a drill press with a rotating spindle? a) They may get caught around the spindle causing the operator to get "pulled in" to the point of operation b) Expensive jewelry can get scratched or damaged from cutting fluid c) Loose clothing has a better chance of getting torn by a chip or stained with cutting fluid) The twist drill will wear out quicker causing oversize holes and the loose clothing may get burned from hot chips

a) They may get caught around the spindle causing the operator to get "pulled in" to the point of operation

Using 3.82 as the constant in the RPM formula with a 250 SFPM cutting speed, a .750-inch high-speed steel twist drill will rotate at 1273 RPM. How fast will a .438-inch high-speed steel twist drill rotate applying the same cutting speed? a) 849 RPM b) 2180 RPM c) 1453 RPM d) 571 RPM

b) 2180 RPM

Which of the following RPM values would be appropriate for reaming a .375- inch diameter hole using a cutting speed of 100 SFPM for drilling (use 3.82 for the constant)? a) 1019 RPM b) 509 RPM c) 907 RPM d) 1529 RPM

b) 509 RPM

Which of the following sets of twist drills are arranged from the largest diameter to the smallest diameter? a) 64, 36, D, A, 51/64 b) 7/16, K, C, 18, 78 c) 21, A, 1/16, 80, D d) 1, 35, D, 51/64, J e) 21/32, 53/64, 42, 1, A

b) 7/16, K, C, 18, 78

Most tap drill charts use a tap drill producing a ______ thread depth. a) 50% b) 75% c) 100% d) 85% e) 45%

b) 75%

Most flat head screws used in metal fabrication and assembly (excluding the aircraft industry) use flat head screws with the included angle of the head measuring: a) 41 degrees b) 82 degrees c) 100 degrees d) 50 degrees

b) 82 degrees

A bell mouth condition at the top of a reamed hole may be caused by: a) An undersized reamer b) A misaligned reamer c) Correct RPM with a slow feed d) A reamer with a back taper (smaller away from the cutting edge)

b) A misaligned reamer

Which one of the following statements is not a safe drill press procedure: a) Using a brush to remove stringy chips from the table b) Having the vise on the right side of the operator c) Plugging an existing hole to drill an intersecting hole d) Center drilling a hole prior to drilling the hole

b) Having the vise on the right side of the operator

To safely handle tools and measuring instruments, they should be: a) Laid on the drill press table or in clamping slots b) Placed on a wooden tray or shop rag away from the drill press table or moving components c) Lubricated with cutting oil and lithium grease d) Stored in a drawer with tools and measuring instruments on top of each other

b) Placed on a wooden tray or shop rag away from the drill press table or moving components

The speed of a twist drill is given in: a) Inches per minute (IPM) b) Revolutions per minute (RPM) c) Inches per revolution (IPR) d) Inches per degree (IPD)

b) Revolutions per minute (RPM)

What generally happens when the web thickness is excessive? a) The drill will cut undersize b) The feed pressure is excessive c) The drill is very solid and feeding pressure is reduced d) The drill will cut cooler since the cutting lip length is reduced e) The drill will break as soon as it is fed into the workpiece

b) The feed pressure is excessive

Changing the tip angle of a drill is in most cases dependent on: a) The web thickness\diameter ratio on the drill b) The material c) The material of the drill itself d) Cutting speed of the drill e) Lubrication used during the drilling operation

b) The material

Thin springy material is supported far away from the drill. What may happen on breakthrough? a) The hole will be undersize due to the springy material "rebounding" inside the hole b) The material will spring back creating a "fin" and causing drill breakage c) The hole will be normal with expected dimensional changes d) The drill will "burn" due to the non-cutting effect of the springy action

b) The material will spring back creating a "fin" and causing drill breakage

Which of the following methods are appropriate for holding round stock for a drilling operation? a) V-blocks b) Drill press vise c) Angle plate and hand pressure to hold the piece part d) Parallels and a strap clamp e) Only a and b f) Only b and d

b) The material will spring back creating a "fin" and causing drill breakage

What is the first parameter to review when selecting a measuring instrument to measure a feature on a piece part? a) Machine tool setup to manufacture the piece part b) The tolerance of the feature to be inspected c) The availability of measuring tools d) The time and cost of measuring the feature

b) The tolerance of the feature to be inspected

Which of the following statements is not a fundamental characteristic of the web? a) The web creates the "dead center" or chisel point of the twist drill b) The web stays the same width throughout the whole length of the drill c) The web is "thinned" to prevent excessive feed pressure d) The web gets larger as the drill becomes shorter in length

b) The web stays the same width throughout the whole length of the drill

What is the stock allowance for reaming a .3125-inch diameter? a) .032 inches b) .002 inches c) .010 inches d) .062 inches

c) .010 inches

What is the tap drill diameter for a ½-14 NPT (pipe thread)? a) 7/16 b) 1 1/2 c) 23/32 d) 3 1/4

c) 23/32

For most materials, what is the practical limit of thread percentage in relationship to the strength of the threads? a) 55% b) 65% c) 75% d) 90% e) 100%

c) 75%

A counterbore is: a) A conical enlargement at the end of a hole used to recess the head of a flat head screw b) Internal threads with a conical axis used to seal the threads c) An enlarge hole with a square bottom concentric to a smaller hole to accept the head of a socket head cap screw d) Small hole with a large conical top to accept a lathe center

c) An enlarge hole with a square bottom concentric to a smaller hole to accept the head of a socket head cap screw

A drilling operation is experiencing frequent drill breakage. The twist drill has the proper point geometry include web thickness and lip clearance angles. A possible solution to the drill breakage problem could be: a) Increasing the RPM 1.5 over the suggest RPM b) Increase the feed rate by half c) Decrease the feed rate d) Decrease the RPM and increase the feed by the same proportion

c) Decrease the feed rate

To obtain a clean hole, reduce burring and prevent drill breakage when the drill starts breaking through the bottom of the work piece, the machinist must: a) Increase the RPM of the twist drill b) Increase the spindle feed pressure c) Decrease the spindle feed pressure d) Clamp the vise to the table and feed as fast as possible

c) Decrease the spindle feed pressure

A high-speed steel twist drill is producing blue chips during a drill operation. This means that the: a) Drill is rotating at the correct RPM b) Drill must have a large lip relief angle c) Drill is rotating at an excessive RPM d) Spindle feed is too slow e) Spindle feed is frozen and burning up

c) Drill is rotating at an excessive RPM

The majority of material removal operations on a drill press involve:a) Turning b) Counterboring c) Drilling d) Spotfacing

c) Drilling

The flutes of a twist drill: a) Are the cutting edges of a twist drill b) Create the chisel point in the center of a twist drill c) Facilitate chip removal d) Are the parts of the twist drill inserted into the drill chuck

c) Facilitate chip removal

The feed rate for a twist drill is given in: a) Inches per minute (IPM) b) Inches per foot (IPF) c) Inches per revolution (IPR) d) Degrees per inch (DPI)

c) Inches per revolution

The feed rate of a reaming operation is about __________ that of a drilling operation for the same tool diameter. a) Four times b) The same c) Two times d) One-half

c) Two times

Most drills will tend to produce a hole that is: a) The same size as the diameter of the drill b) A tapered hole that enlarges toward the opposite side c) Slightly oversize hole d) Slightly undersize hole

c) slightly undersize hole

Five holes are equally spaced. The distance from the first hole to the fifth hole is 4 11/16 inches. What is the distance between each hole? a) 1 13/32 b) 15/16 c) 1 9/16 d) 1 11/64

d) 1 11/64

Using the Machinery's Handbook for a reference, determine the RPM for a .375 inch high speed steel twist drill cutting through 1030 plain carbon steel with a Brinell hardness of 150 (use 3.82 as the constant): a) 603 RPM b) 215 RPM c) 1528 RPM d) 917 RPM

d) 917 RPM

A center drill is: a) Used for spotting holes b) A drill with a countersink at a 60° angle c) A drill used to create a bearing surface for lathe centers d) All of the above e) Only a and c

d) All of the above

An excessive lip clearance angle may cause a twist drill to: a) Cause excessive wear on the margin of the drill near the shank b) Easier feeding due to chip clearance relief angles and an excessive web c) Reduce feed pressure through increased rake d) Chip or break out at the cutting edges

d) Chip or break out at the cutting edges

Which one of the following tools would be considered a precision layout tool? a) Plate protractor b) Machinist scale c) Combination square and rule d) Digital height gage with a scriber attachment

d) Digital height gage with a scriber attachment

Which of the following statements does not address the proper lifting technique used to lift heavy objects? a) Bend the knees and lift with the legs b) The back should be kept as straight as possible c) Bend the arms slightly, but do not lift with the arms d) Hunch the back and lift with the arms, keep the legs locked

d) Hunch the back and lift with the arms, keep the legs locked

Which following type of drill press is used to drill very large pieces? a) Sensitive drill press b) Magnetic based drilling machine c) Microdrill press d) Radial drill press

d) Radial drill press

When a reamer gradually starts to cut oversize, a root cause may be: a) Chamfer and cutting edge runout b) Excessive stock allowance causing material pickup or galling c) Non-concentric shank d) Misalignment of the spindles e) All of the above f) All except d and e

e) All of the above

Which of the following parameters affect the final diameter created by a twist drill? a) Cutting speed b) The lubrication applied c) The type of material d) The way the cutting lips and web are ground e) All of the above f) Only a and b

e) All of the above

To ream mild steel with a high-speed steel reamer, the cutting speed should be ________ that of drilling with the same size drill. a) One eighth b) One fifth c) Twice d) The same as e) One half

e) One half

Which of the following may be a root cause of a twist drill that binds in the hole? a) The clearance on the margin is worn b) The set up is creating vibration c) The chips are packed in the hole and flute of the twist drill d) All of the above e) Only a and c

e) Only a and c

Incorrect drill point angles and clearances will generally produce drilled holes that are: a) Undersize b) Out of round c) Oversize d) Only a and b e) Only b and c

e) Only b and c

To reduce breakage of center drills: a) Increase the feed rate 1.5 times b) Back out the center drill frequently to remove chips c) Increase the RPM 2 times for a similar diameter twist drill d) Use a slow feed to protect the small drill end e) Only a and c f) Only b and d

f) Only b and d