NIMS Machining Level 1 Exam
Questions All Correct Answers
Applying the formula below, find the taper per foot for a workpiece with a large diameter
of 3.5 inches and a small diameter of 2.75 inches with a taper length of 5.5 inches. -
Answers -✔✔ 1.64 inches
Use a calculator to determine the included angle for a taper of 0.550 inches per foot. -
Answers -✔✔ 2.626 degrees
What is the taper per foot for a piece 7.5 inches long with a 0.056 taper? - Answers -
✔✔ 0.0896 inch taper per foot
Referring to the Machinery's Handbook, what is the minimum pitch diameter for an
external thread 7/16-14 UNC - 2A? - Answers -✔✔ 0.385 inches
Referring to the Machinery's Handbook, what is the tap drill for a 5/16 - 18 UNC thread
with a 75% thread engagement? - Answers -✔✔ 0.257-inch diameter drill
The feed rate on a lathe is given in: - Answers -✔✔ IPR
Calculate the RPM for a drilling operation with a cutting speed of 150 SFM applying a
1/4" diameter drill with a feed rate of 0.005 inches per revolution. - Answers -✔✔ 2400
RPM
The time required to make three turning passes over a piece of stainless steel 8.5
inches in length at 350 rpm with a 0.006" feed is approximately __ minutes. - Answers -
✔✔ 12.1 minutes
The largest square that can be machined from a 2.5-inch diameter piece of steel would
be: - Answers -✔✔ 1.767 inches per side
To convert inches to millimeters, a machinist would use a constant of __. - Answers -
✔✔ 25.4
What is the angle to the centerline for an 8.375-inch taper that has a large diameter of
3.470 inches and a small diameter of 2.955 inches? - Answers -✔✔ 1.761 degrees
Convert the tolerance range +/- 0.005 inches into millimeters rounded to the nearest
hundredth of a millimeter (0.01) - Answers -✔✔ 0.25 mm
Questions All Correct Answers
Applying the formula below, find the taper per foot for a workpiece with a large diameter
of 3.5 inches and a small diameter of 2.75 inches with a taper length of 5.5 inches. -
Answers -✔✔ 1.64 inches
Use a calculator to determine the included angle for a taper of 0.550 inches per foot. -
Answers -✔✔ 2.626 degrees
What is the taper per foot for a piece 7.5 inches long with a 0.056 taper? - Answers -
✔✔ 0.0896 inch taper per foot
Referring to the Machinery's Handbook, what is the minimum pitch diameter for an
external thread 7/16-14 UNC - 2A? - Answers -✔✔ 0.385 inches
Referring to the Machinery's Handbook, what is the tap drill for a 5/16 - 18 UNC thread
with a 75% thread engagement? - Answers -✔✔ 0.257-inch diameter drill
The feed rate on a lathe is given in: - Answers -✔✔ IPR
Calculate the RPM for a drilling operation with a cutting speed of 150 SFM applying a
1/4" diameter drill with a feed rate of 0.005 inches per revolution. - Answers -✔✔ 2400
RPM
The time required to make three turning passes over a piece of stainless steel 8.5
inches in length at 350 rpm with a 0.006" feed is approximately __ minutes. - Answers -
✔✔ 12.1 minutes
The largest square that can be machined from a 2.5-inch diameter piece of steel would
be: - Answers -✔✔ 1.767 inches per side
To convert inches to millimeters, a machinist would use a constant of __. - Answers -
✔✔ 25.4
What is the angle to the centerline for an 8.375-inch taper that has a large diameter of
3.470 inches and a small diameter of 2.955 inches? - Answers -✔✔ 1.761 degrees
Convert the tolerance range +/- 0.005 inches into millimeters rounded to the nearest
hundredth of a millimeter (0.01) - Answers -✔✔ 0.25 mm
