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WorksheetsCalculations for Programming the Mill 312
Total questions: 28
Worksheet time: 28mins
What is the most common location for program zero on a symmetrical part?
Part center
Top right corner
Bottom left corner
Location of the first feature
What is step-over? Step-over is:
Cutter motion that occurs in multiple axes at once.
The portion of the cutter that is clear or outside of the cut.
The portion of the cutter that is engaged in the cut.
Toolpath directions that are repeated within a program.
A programmer is making calculations for a spot drilling operation. The diameter of the final desired hole will be 0.5 inch (12.7 mm). The hole will also have a 0.02 in. (0.51 mm) chamfer. What is the required depth for the spot drill?
0.27 in. (6.858 mm)
0.52 in. (13.208 mm)
0.25 in. (6.35 mm)
0.23 in. (5.842 mm)
What trigonometric ratio for an angle is the side opposite of an angle divided by the hypotenuse?
Tangent
Cosine
Sine
Adjacent
What coordinate system is used to calculate CNC mill movements?
Euclidean
Polar
Cartesian
Dimensional
A programmer is determining the Y axis locations for a face milling operation using a cutter with a 4.000 in. (101.600 mm) diameter. If the edge of the cutter has to pass at Y=1.500 in. (38.100 mm), what is the Y location that must be entered into the program?
Y = 3.500 in. (88.900 mm)
Y = 0.500 in. (12.7000 mm)
Y = 2.000 in. (50.800 mm)
Y = 5.500 in. (139.700 mm)
What is the name of the series of rectangular movements that create an end-milled pocket?
Ramping motion
Step-over
Boxing routine
Bolt-hole pattern
A programmer writes a part program to cut a 4.0 in. (101.6 mm) by 5.5 in. (139.7 mm) by 1 in. (25.4 mm) pocket into a workpiece using an end mill with a diameter of 0.5 in. (12.7 mm). After the program completes, the programmer finds that the pocket is 0.25 in. (6.35 mm) longer and wider than he had intended. What offset did the programmer forget to set?
Cutter radius compensation
Workshift offset
Program zero offset
Wear offset
A programmer wants to use arc-in and arc-out motions to create a circular cut. Which of the following would be best to accomplish this?
Pocket milling
Boxing routine
Radius method
Arc center method
A programmer is calculating the Z axis coordinate location for the total drill depth for a through hole on a 1.0 in. (25.4 mm) thick part. The tip length of the 0.6 in. (15.24 mm) diameter drill is 0.18 inches (4.572 mm), and it will require a 0.030 in. (0.762 mm) clearance. What is the correct Z value to program for this hole?
Z = 1.21 in. (30.734 mm)
Z = -1.21 in. (-30.734 mm)
Z = -0.79 in. (-20.066 mm)
Z = 0.79 in. (20.066 mm)
A programmer performs the following calculations to find a set of X and Y axis coordinates: Connect X and Y axes to hole center to form right triangle with radius as hypotenuse, where angle B is 60 degrees. Find the sine of B to find the X axis distance. Find the cosine of B to find the Y axis distance. For what feature is the programmer finding coordinate locations?
A blending location in an arc-in motion.
The start of a boxing routine
A hole in a bolt-hole pattern
The I and J code locations
What tool starts and accurately locates holes?
End mill
Spot drill
Twist drill
Face mill
What term is used to describe the series of coordinates that dictates tool movement?
Toolchanger
Program zero
Toolpath
Step-over
An end mill is cutting a pocket into a workpiece. What are the likely toolpath movements that will create this pocket? Start at the pocket's top left corner, make counterclockwise circular cuts in the following pattern:
Start at the pocket's top left corner, make counterclockwise circular cuts in the following pattern: +Y, -X, -Y, +X
Start at pocket center, make linear cuts in the following pattern: +Y, -X, -Y, +X
Start at the pocket's left side, make linear cuts in the following pattern: -Y, +X, +Y, -X
Start at pocket center, make clockwise circular cuts in the following pattern: -Y, +X, +Y, -X
Which of the following is used to create a flat surface precisely located at Z = 0?
Linear interpolation
Pocket milling
Face milling
Cutter radius compensation
A programmer is calculating the Z axis coordinate location for the total drill depth for a through hole on a 2.0 in. (50.8 mm) thick part. The tip length of the 1.0 in. (25.4 mm) diameter drill is 0.3 inches (7.62 mm), and it will require a 0.05 in. (1.27 mm) clearance. What is the correct Z value to program for this hole?
Z = 2.35 in. (59.69 mm)
Z = -2.35 in. (-59.69 mm)
Z = 1.65 in. (41.91 mm)
Z = -1.65 in. (-41.91 mm)
A programmer wants to create a full-circle cutting motion. Which of the following is best used for full-circle motions?
Arc center method
Boxing routine
Radius method
Bolt-hole pattern
Where do programmers often locate program zero if a part is not symmetrical?
Part center
Location of the first feature
Corner of the part
Left side
What is the angle of the tip of a typical twist drill?
59°
115°
118°
27°
What is the purpose of a spot drill? A spot drill:
Starts and locates pockets.
Starts and locates holes.
Finishes pockets.
Creates through holes.
Which of the following is the correct method to calculate coordinates for a location in a bolt-hole pattern?
Form a 60 degree right triangle with the radius, X axis, and Y axis. Find the sine of B to find the X axis distance. Find the cosine of B to find the Y axis distance.
Form two 59 degree right triangles. The hole/tool radius forms side B. Find the tangent of B to find the Z axis location.
Locate the tool on the X axis (X = 0). Calculate half of the feature radius. Subtract the tool radius from the result for the Y axis location.
A programmer is making calculations for a spot drilling operation. The diameter of the final desired hole will be 1.0 inch (25.4 mm). The hole will not have a chamfer. What is the required depth for the spot drill?
0.5 in. (12.7 mm)
0.1 in. (2.5 mm)
2.0 in. (50.8 mm)
1.5 in. (38.1 mm)
A programmer is determining the X axis locations for a face milling operation using a cutter with a 2.000 in. (50.800 mm) diameter. X= -3.500 in. (-88.900 mm) at the left edge of the workpiece. The cutter must start to the left of the workpiece, with a 0.150 in. (3.810 mm) approach. What is the X axis location that should be programmed for the start of the cut?
X = -5.650 in. (-143.510 mm)
X = -1.350 in. (-34.290 mm)
X = -4.650 in. (-118.110 mm)
X = -2.350 in. (-59.690 mm)
An end mill cuts into the center of a part feature, makes four linear movements— +Y, -X, -Y, +X—and then repeats this cutting pattern until the feature is completed. What type of toolpath is this?
Boxing routine
Ramping motion
L/d deflection
Bolt-hole pattern
Which three axes describe three-dimensional movement on the CNC mill?
R, L, and U
J, K, and L
A, B, and C
X, Y, and Z
A programmer needs to use a 0.750 in. (19.050 mm) end mill to create a pocket. What offset should the programmer use to ensure that the dimensions of the finished pocket will be as intended?
Wear offset
Ramping
Cutter radius compensation
Length-to-diameter ratio
An operator is using an end mill that is 4.000 in. (101.600 mm) long with a 1.000 in. (25.400 mm) diameter for a pocket milling operation. Given the measurements of the end mill, what issue could occur?
Ramping
Deflection
Boxing
Step-over
A series of G codes written one after the other with the object of producing a completed workpiece is called a:
Format
Blueprint
Tolerance definition
Part program
