- Joined
- Sep 22, 2010
- Messages
- 7,222
Questions and Answers
- 1.
When referring to CNC programming, which of the following is the command coed to move the tool in the clockwise direction?- A.
G01 - B.
G02 - C.
G03 - D.
G17
- A.
- 2.
When referring to CNC programming, which of the following is the program format for circular interpolation in a counter clockwise direction?
Discuss- A.
G90 G01 X_Y_R_F_; - B.
G17 G02 X_Y_R_F_; - C.
G90 G01 X_Y_Z_F_; - D.
G17 G03 X_Y_I_J_F_;
- A.
- 3.
When referring to CNC programming, which of the following is the command coed to move the tool in the counter clockwise direction?- A.
G01 - B.
G02 - C.
G03 - D.
G17
- A.
- 4.
When referring to the elements of word address CNC programming, a "1" bit is a representation of an _________ condition.- A.
On - B.
Emergency - C.
Off - D.
Ultimate
- A.
- 5.
Calculate the feed per minute when an 8 tooth CNC cutter is rotating at 700 rpm and the chip load is 0.008 inch. The feed per minute will be _______ inches.- A.
56.0 - B.
44.8 - C.
5.6 - D.
0.7
- A.
- 6.
Which of the following operations will produce a hole with 45 degree chamfers?- A.
Blind hole drilling. - B.
Spot drilling. - C.
Center drilling. - D.
Counter sinking.
- A.
- 7.
The most common type of feed drives used on CNC machines is the:- A.
Electric servo motor. - B.
Hydraulic drive. - C.
Manual crank. - D.
Manual/hydraulic system.
- A.
- 8.
When referring to CNC tapping operations, what does the acronym TDS stand for?- A.
Tap Drilling Speed - B.
Total Diameter Size - C.
Tap Drill Size - D.
Tap Down Speed
- A.
- 9.
When referring to CNC operations, an excessive surface cutting speed will result in:- A.
Extended tool life. - B.
A longer time to machine the workpiece. - C.
Rapid tool wear. - D.
A decreased use of coolant.
- A.
- 10.
When referring to common CNC programming structures, which of the following is the best example of an end of block character?- A.
; - B.
G - C.
G00 - D.
%
- A.
- 11.
What is a major disadvantage of the vertical spindle machining centers?- A.
They can handle heavy workpieces. - B.
Chips accumulate on top of the workpiece. - C.
Some of the spindles have vertical motion. - D.
The crosslide can move transversally.
- A.
- 12.
When referring to CNC programming, which of the following multiple hole patterns is typically the simplest to program?- A.
An arc hole pattern. - B.
A bolt hole circle. - C.
A linear hole pattern. - D.
An angular hole pattern.
- A.
- 13.
The coolant system of a CNC machine would most commonly be a __________ pump.- A.
Low pressure - B.
Medium pressure - C.
High pressure - D.
Gravity
- A.
- 14.
What does the X and Z relate to with a CNC faced can cycle having a G94X__Z__F__; code?
Discuss- A.
It is the program feed rate. - B.
It is the incremental dimensions from park location to cutting start and end points. - C.
It is the absolute dimensions of the cutting start and end points. - D.
It is the facing canned cycle command.
- A.
- 15.
Which of the following statement is true with respect to CNC multiple repetitive machining cycles?- A.
It is not possible to program tool nose radius compensation when using repetitive cycles G70-72. - B.
When programming TNR inside the cycle, you must cancel the compensation inside the cycle. - C.
It is not possible to program and cancel TNR outside the repetitive cycle - D.
For pattern repeating cycle G 73 the operator programs the number of rough cuts and the DOC workpiece.
- A.
- 16.
With CNC repetitive cycle programming, what does the D stand for in the code G71P__Q__U__W__D__S__F__; (rough turning and boring repetitive cycle)
Discuss- A.
The ratio of cut from the far to near surface. - B.
The depth of cut for the roughing pass. - C.
It is a block number immediately following the G71. - D.
It tells the CPU how the X value must be adjusted.
- A.
- 17.
Which of the following CNC codes relates to "spindle on" counter clockwise at constant surface speed?- A.
N020 T0101 - B.
N 030 G50 X8.500 Z7.500 S3000 - C.
N040 M04 S500 G96 - D.
N200 M05
- A.
- 18.
With CNC programming it is good practice to program a rapid motion in ____ axis at a time.- A.
4 - B.
3 - C.
2 - D.
1
- A.
- 19.
When should a CNC linear interpolation command never be used?- A.
For programs longer than 27 lines - B.
Outside the work area. - C.
For canned programs - D.
With projects using 4 quarter addressing.
- A.
- 20.
With CNC linear interpolation programming what does the U refer to in G01U__W__F__; (incremental feed motion)?- A.
The coordinate along the X axis. - B.
The coordinate along the Z axis. - C.
The program feed code. - D.
The linear interpolation code.
- A.
- 21.
When applying tool measurement using a master reference tool and work shift, all Z values can be set to a pre-machined workpiece or the:- A.
Reference point of the machine. - B.
Face of the chuck. - C.
X0 point. - D.
Base of the tool turret.
- A.
- 22.
Which of the following statement is true with respect to CNC multiple repetitive machining cycles?- A.
For boring or internal facing the tool must be located above the cored diameter. - B.
Only absolute values may be used for co-ordinate positions. - C.
The starting point should be as far away from the workpiece as possible to assist with tool movement. - D.
For external turning and facing the tool must be located above and in front of the workpiece.
- A.
- 23.
Which of the following CNC codes deals with a multiple repetitive, rough cutting cycle used for facing operations?- A.
G94 - B.
G76 - C.
G72 - D.
G68
- A.
- 24.
Refer to the program format of the following canned cycle for threading. G92 X__Z__F__ The value X indicates:
Discuss- A.
The lead of the thread to four decimal places. - B.
The length of the thread including the deceleration distance. - C.
The minor diameter of the thread for external threads. - D.
The depth of cut for the threading pass.
- A.
- 25.
With CNC repetitive cycle programming, what does the P stand for in the code G71P__Q__U__W__D__S__F__; (rough turning and boring repetitive cycle)- A.
The block number of the first tool motion from tool park location for machining the finish profile. - B.
The block number of the last tool motion completing the part profile and closing the repetitive cycle loop. - C.
The amount of material left on the diameter for the finish cut. - D.
The amount of material that is left on the Z faces for the finish cut.
- A.
- 26.
Which of the following CNC codes cancels the mirror image coordinates for double turret turning centres?- A.
G94 - B.
G76 - C.
G72 - D.
G69
- A.
- 27.
How are CNC "G" codes grouped?- A.
According to their bit size. - B.
According to their function. - C.
Based on their sequence. - D.
Based on the number of significant digits.
- A.
- 28.
When programming a multiple-start threading operation for a CNC machine, the shift amount is always equal to the ________ of the thread.- A.
Lead - B.
Depth - C.
Pitch - D.
Lag
- A.
- 29.
With CNC linear interpolation programming what does the W refer to in G01U__W__F__; (incremental feed motion)?- A.
The coordinate along the X axis. - B.
The coordinate along the Z axis. - C.
The program feed code. - D.
The linear interpolation code.
- A.
- 30.
In the following typical G10 command block for a Fanuc control, what does the letter "L" stand for? N____G10L___R___T___:
Discuss- A.
The block number. - B.
The type of offset. - C.
The value of the tool nose radius. - D.
The tool orientation number.
- A.
- 31.
With CNC turning machines and preparatory codes what does a "G01" represent?
Discuss- A.
A code that allows the tool to dwell at a location. - B.
It instructs the control to move rapidly to specific X and Z locations. - C.
It is a linear interpolation feed rate code. - D.
It directs the machine control to use to use workpeice coordinate values stored in memory.
- A.
- 32.
What diameter must be used when doing spindle calculations for threading operations with a CNC machine?- A.
The diameter of the bit. - B.
The major diameter of the thread being cut. - C.
The outside diameter of the headstock. - D.
The inside major diameter of the thread being reamed.
- A.
- 33.
With respect to CNC turning centres which of the following is true with respect to multiple spindle-multiple turret arrangements?- A.
It is used where work must be machined on both ends. - B.
It is designed for work that must be machined from both sides at the same time. - C.
It is the most common arrangement. - D.
It is used in high production machining.
- A.
- 34.
When using the right hand rule for identifying an axis, what does the index finger represent?- A.
The Z axis. - B.
The Y axis. - C.
The X axis.
- A.
- 35.
What type of transducer is a resolver?- A.
Transitional - B.
Positional - C.
Modulated - D.
Direct
- A.
- 36.
What angle of bed decline do most CNC turning machines have to assist with chip management?- A.
70-85 - B.
50-65 - C.
30-45 - D.
18-28
- A.
- 37.
In which of the following CNC program preparation systems is the program prepared off line then stored on a disc or hard drive ?- A.
Text editor. - B.
MDI. - C.
CAM software. - D.
MMI configuration.
- A.
- 38.
With CNC turning machines, the programmed speed for tapping is generally 25 to ____ % of that used for drilling.- A.
50 - B.
46 - C.
33 - D.
27
- A.
- 39.
Which of the following is true with respect to a Preparatory (G) code?- A.
They turn various functions of the machine on or off. - B.
They are modal or non modal. - C.
They follow EIA/ASC11 guidelines. - D.
It controls directly tool, speed and feedrate functions.
- A.
- 40.
What principle of measurement does a rotary encoder use?- A.
Transitional - B.
Positional - C.
Indirect - D.
Direct
- A.
- 41.
What does the semicolon symbol represent with CNC machines and basic addresses?
Discuss- A.
It is used for comments and messages in front of the program. - B.
It is used to skip program blocks. - C.
It is used to indicate program number for ISO standard. - D.
It is used at the end of each program block.
- A.
- 42.
With CNC turning machines and Miscellaneous (M ) codes what does a "M03" represent?- A.
Program stop and ends program execution. - B.
Optional stop used when occasional part inspection may be required. - C.
Spindle on in clockwise rotation. - D.
Spindle on in counter clockwise rotation.
- A.
- 43.
Which of the following is true with respect to CNC machines and program storage that uses hard drives?
Discuss- A.
The tape has to be fast forwarded or reversed to locate the required program. - B.
It is historically the only medium for program storage and transfer - C.
They can be used for storage large amounts of program data in a compressed form. - D.
They can be affected by viruses but have the largest storage capacity.
- A.
- 44.
What is the common rotary resolution for most CNC machines in degrees?- A.
0.0001 - B.
0.001 - C.
0.01 - D.
0.1
- A.
- 45.
Which of the following best describes a PLC.
Discuss- A.
RAM connecting directly to binary logic allowing machining logic. - B.
It is a type of ROM that allows a programmed feedback loop. - C.
Its function is to develop signals from program data for driving servo motors. - D.
It allows a CNC machine to be programmed.
- A.
- 46.
When using the right hand rule for identifying an axis, what does the middle finger represent?- A.
The Z axis. - B.
The Y axis. - C.
The X axis.
- A.
- 47.
Which of the following is true with respect to CNC machines and program storage that uses perforated or punched tape?- A.
The tape has to be fast forwarded or reversed to locate the required program. - B.
It is historically the only medium for program storage and transfer - C.
They can be used for storage large amounts of program data in a compressed form. - D.
They can be affected by viruses but have the largest storage capacity.
- A.
- 48.
With CNC repetitive cycle programming and boundaries which of the following describes park location D?
Discuss- A.
The position of the tool clear of the work piece after the profile is machined. - B.
The last location on the work piece defining the profile to be machined. - C.
The first location chew off the work piece before defining the part profile to be machined - D.
The XZ position of the tool before the repetitive cycle G71 is activated.
- A.
- 49.
What is zero suppression when dealing with CNC machines?
Discuss- A.
It allows dimensions to be written without the zeros in front of the decimal point. - B.
It is used to reduce the number of zeros in the full format dimensions. - C.
It allows dimensions to be written without the zeros after the decimal point - D.
Where eight digits are required for each dimension.
- A.
- 50.
What does odd parity mean in reference to CNC terminology?
Discuss- A.
Each program character is represented in rows containing odd number holes. - B.
The number of wires from the controller to the hardware is always odd. - C.
The RAM is sectored off in odd divisions. - D.
The hard drive is mathematically tuned to mathematical operations thst result in odd numbers.
- A.
