Machinist Quiz

Please fill out your name.* Please use the same first and last name on your job application.

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Last

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1. You determine that a Feed rate for a particular tool must be 5.0 inches per minute (or 5 millimeters per minute in the metric mode). The correct designation in the program would be:*

F0.5

S5.0

F5.0

F0.005

2. You are running a proven program (one run before) for the first time in a new setup. You are cautiously allowing the first tool to come into its approach position when you determine that the tool is not going where it is supposed to. The most likely reason is:*

The spindle speed is not correct

The dry run switch should be turned on

The programmed coordinates are not correct

The program zero designation is not correct

3. What mode switch position allows programs to be modified?*

4. What mode switch position allows a program to be run from within the CNC control?*

5. What mode switch position lets you move the machine axes manually?*

6. Which on/off switch works in conjunction with an M01 in the program?*

7. The Feed rate Override switch lets the operator control the machine’s movement rate during cutting commands*

True

False

8. The button used to temporarily stop the CNC cycle is:*

9. The button that will reactivate the CNC program after temporary stoppage is:*

10. The display screen mode that lets the operator actually see the CNC program is the:*

23. You are running the first workpiece with a proven program. Tool number five is a milling cutter machining a pocket to a very tight depth tolerance. You should:*

Simply run the milling cutter. If the tool length compensation value, the program Z coordinates, and the program zero assignment in Z are correct, the pocket will come out right to size.

Increase the tool length compensation value for tool five by a small amount. This will force excess stock to be left in the pocket. After machining, check the pocket depth and adjust the tool length compensation offset value accordingly and return the tool.

11. The display screen mode that lets the operator enter tooling related data is the:*

12. As part of the machine start up procedure, you must send the machine to its zero return (home) position:*

True

False

13. There is always some way to adjust offsets to ensure that every tool in every program will machine with a little excess stock. Meaning (if the program is correct) there is never an excuse to scrap the first workpiece in a production run.*

True

Fales

14. While there is never a good excuse for a crash, if you do have a mishap and your machine crashes, you should:*

Check visually to see that there is no damage and continue running production

Immediately notify your supervisor

Fix any damage and continue running production

Stop running production for the balance of your shift

15. As you are verifying a new program that has never run before, you find what you consider to be a serious mistake in the program’s motions. You should:*

Do your best to fix the mistake and continue

Notify your supervisor so the programmer can be contacted

Assume that the program has been well checked by the programmer and run the program as it is

16. A program stop is encountered and the machine stops. However, you are not sure why the program stop is in the program. You should:*

Press cycle start to resume the programs execution

Call up the program display screen mode and see if there is a message telling you what to do

Turn on single block to cautiously step through the next few commands

17. Spindle speed for machining centers is always specified in:*

Surface feet or meters per minute

RPM

Inches per minute

Inches per revolution

18. When viewing a vertical machining center from the front, the X Axis is forward/back, Y is left/right, and Z is up/down.*

True

Fales

19. You need to manually make a tool change to place tool number one in the spindle. However, the machine has no manual buttons or switches for making tool changes. You must:*

Contact the machine tool builder to fix the machine

Write a short program to make the tool change

Use the MDI mode to command the tool change using program-like commands

You cannot manually activate the tool changer with this machine

20. You are running the first workpiece with a proven program (one that has run before). The first four tools cut just fine. However, the fifth tool (an end mill machining a pocket) does not cut quite deep enough. It is most likely that:*

The program zero assignment is incorrect

The tool length compensation offset for tool five is not correct

The cutter radius compensation offset for tool five is not correct

The program coordinates for tool five are incorrect

21. You are verifying a new program, cautiously allowing each tool to approach the workpiece using single block and dry run. Tools one and two run just fine. However, as tool three gets within about one inch of the work surface, you are worried that it may not stop in its correct position, so you press feed hold and check the DISTANCE-TO-GO page on the display screen. Sure enough, the distance to go reads a value of Z-3.5435 inches. It is likely that:*

Tool length compensation is not instated for this tool choice

The tool length compensation offset value is incorrect

The programmed Z approach coordinate for tool three is incorrect

Any of the above

22. You are running the first workpiece with a proven program (one that has run before.) Tool number four is a milling cutter that machines a pocket. The pocket is supposed to be 0.5000 in +-0.001 deep. However, after tool four mills the pocket, you find the pocket to be 0.4970 deep. You must:*

Change the program to make the end mill plunge 0.003 in deeper

Increase the tool length compensation value by 0.003 in

Decrease the tool length compensation value by 0.003 in

Increase the program zero designation Z value by 0.003 in