Proficiency Test For Machining Center - CNC …

1 Proficiency Test For Machining CenterName:Date:Section One: General CNC Questions1) The spindle speed for a particular tool in a program is incorrectand you wish to reduce it. The kind of CNC word you mustchange is:qA) an F wordqC) an S wordqB) a G wordqD) a T word2) You determine that a feedrate for a particular tool must be per minute (or 5 millimeters per minute in the metricmode). The correct designation in the program would be:qA) ) ) ) ) You are running a proven program (one run before) for the firsttime in a new setup. You are cautiously allowing the first toolcome into its approach position when you determine that thetool is not going where it is supposed to.

2 It is most likely that:qA) the spindle speed is not correctqB) the program zero designation is not correctqC) the dry run switch should be turned onqD) the programmed coordinates are not correct4) When coordinates going into a program are specified relative tothe program zero point, it is called:qA) the incremental modeqB) the absolute modeqC) the rapid modeqD) the canned cycle mode5) What mode switch position allows programs to be modified?qA) JogqD) EditqB) AutoqE) Zero returnqC) MDI (manual data Input)6) What mode switch position allows a program to be run fromwithin the CNC control?

3 QA) JogqD) EditqB) AutoqE) Zero returnqC) MDI (manual data Input)7) What mode switch position allows the activation of a single CNCcommand?qA) JogqD) EditqB) AutoqE) Zero returnqC) MDI (manual data Input)8) What mode switch position allows you to send the machine to itsreference (home) position?qA) JogqD) EditqB) AutoqE) Zero returnqC) MDI (manual data Input)9) What mode switch position lets you move the machine axesmanually?qA) JogqD) EditqB) AutoqE) Zero returnqC) MDI (manual data Input)10) Which on/off switch works in conjunction with a slash code inthe program?

4 QA) Dry RunqD) Single BlockqB) Optional StopqE) Machine LockqC) Optional Block Skip/Block Delete11) Which on/off switch works in conjunction with an M01 in theprogram?qA) Dry RunqD) Single BlockqB) Optional StopqE) Machine LockqC) Optional Block Skip/Block Delete12) Which on/off switch makes the control activate one command inthe program at a time and then stop?qA) Dry RunqD) Single BlockqB) Optional StopqE) Machine LockqC) Optional Block Skip/Block Delete13) The Feedrate Override switch lets the operator control the ma-chine s movement rate during cutting ) The button used to activate a CNC program is:qA) ResetqD) Cycle StartqB) Emergency StopqE) Feed HoldqC) Coolant On15) The button used to temporarily stop the CNC cycle is:qA) ResetqD) Cycle StartqB) Emergency StopqE) Feed HoldqC) Coolant On16) The button that will reactivate the CNC program after temporarystoppage is.

5 QA) ResetqD) Cycle StartqB) Emergency StopqE) Feed HoldqC) Coolant On17) The button that will clear data in the look-ahead buffer after atemporary program stoppage is:qA) ResetqD) Cycle StartqB) Emergency StopqE) Feed HoldqC) Coolant OnTest Page OneGeneral CNC Questions (continued)18) The button that will actually turn off the power to the machinetool is:qA) ResetqD) Cycle StartqB Emergency StopqE) Feed HoldqC) Coolant On19) The display screen mode that lets the operator actually see theCNC program is the:qA) Offset pageqD) Program pageqB) Position pageqE) Program Check pageqC) Alarm page20) The display screen mode that lets the operator enter tooling re-lated data is the:qA) Offset pageqD) Program pageqB) Position pageqE) Program Check pageqC) Alarm page21) The display screen mode that lets the operator most easily seeaxis data is the:qA) Offset pageqD) Program pageqB) Position pageqE) Program Check pageqC) Alarm page22) The display screen page that will be automatically displayedwhen the CNC control determines a problem is the.

6 QA) Offset pageqD) Program pageqB) Position pageqE) Program Check pageqC) Alarm page23) The display screen page that allows the operator to see a thedistance-to-goin the current CNC command is the:qA) Offset pageqD) Program pageqB) Position pageqE) Program Check pageqC) Alarm page24) Say your machine does not allow manual control of the spindle,yet you must start the spindle during setup. You must:qA) contact the machine tool builder to have them fix themachineqB) write a CNC program that starts the spindle at yourdesired speedqC) use the MDI mode to activate the spindleqD) give up.

7 There is no way to start the spindle25) As part of the machine start up procedure, you must send themachine to its zero return (home) ) Proven CNC programs (those run before) require no programverification ) There is always some way to adjust offsets to ensure that everytool in every program will machine with a little excess stock,meaning (if the program is correct) there is never an excuse toscrap the first workpiece in a production ) How often should you check the way lubrication levels on yourCNC machine?qA) Once every hourqC) Once every shiftqB) Once every weekqD) Once every month29) While there is never a good excuse for a crash, if you do have amishap and your machine crashes, you should.

8 QA) check visually to see that there is no damage andcontinue running productionqB) immediately notify your supervisorqC) fix any damage and continue running productionqD) stop running production for the balance of your shift30) As you are verifying a new program that has never run before,you find what you consider to be a serious mistake in the pro-gram s motions. You should:qA) do your best to fix the mistake and continueqB) notify your supervisor so the programmer can becontactedqC) assume that the program has been well checked bythe programmer and run the program as it is31) When having a problem of almost any kind, it is often helpful tobe able to look at a list of all currently instated commands.

9 Thedisplay screen mode that allows this is:qA) ProgramqC) OffsetqB) Program CheckqD) Position32) A program stop is encountered (M00) and the machine , you are not sure why the program stop is in the pro-gram. You should:qA) press cycle start to resume the program s executionqB) call up the PROGRAM display screen mode and see ifthere is a message telling you what to do near the M00qC) turn on single block to cautiously step through thenext few commands33) While running a new program, the machine goes into alarmstate and shows alarm number 41 with the message Overcuttingwill occur during cutter radius compensation.

10 You should:qA) restart the program and try againqB) turn on single block and cautiously run the next fewcommandsqC) consult the alarm list in the operation manual to fur-ther diagnose the alarm34) After diagnosing an alarm it is possible that you must:qA) change a tool offset valueqB) edit commands in the programqC) press the reset button to cancel the alarmqD) all of the aboveTest Page TwoProficiency TestSection Two: Machining Center Questions35) Spindle speed for Machining centers is always specified in:qA) surface feet or meters per minuteqB) RPMqC) inches per minuteqD) inches per revolution36) When viewing a vertical Machining Center from the front, the Xaxis is left/right, Y is fore/aft, and Z is ) Many Machining Center setups require manual measurements todetermine the program zero assignment values.