27 August Aerospace Machining G-code

1. 1. What does the G21 command do in the G-code program?

• A) Sets the units to inches

• B) Sets the units to millimeters

• C) Selects the XY plane for machining

• D) Selects absolute positioning

2. 2. What is the purpose of the G17 command in this program?

• A) Sets the units to millimeters

• B) Selects the XY plane for machining

• C) Selects the Z plane for machining

• D) Activates the drilling cycle

3. 3. What positioning mode does the G90 command activate?

• A) Incremental positioning

• B) Absolute positioning

• C) Relative positioning

• D) Polar positioning

4. 4. What does the G81 command initiate in the program?

• A) A tapping cycle

• B) A drilling cycle

• C) A boring cycle

• D) A milling cycle

In the command G81 Z-12.0 R2.0 F100, what does R2.0 specify?

• A) The drilling depth

• B) The feed rate

• C) The retract height

• D) The tool diameter

What does the G98 command do in this program?

• A) Returns to the initial Z height after each hole

• B) Cancels the canned cycle

• C) Sets the feed rate

• D) Sets the units to inches

What is the purpose of the G00 command in the lines G00 X50 Y65 and G00 X65 Y50?

• A) Drills the holes

• B) Cancels the canned cycle

• C) Moves the tool to the specified position

• D) Ends the program

Which command is used to cancel the drilling cycle in this program?

• A) G00

• B) G80

• C) M30

• D) G98

What is the final command M30 used for in this program?

• A) Starts the drilling cycle

• B) Moves the tool to the home position

• C) Ends the program

• D) Changes the tool

What is the purpose of the command G00 Z2.0 in the program?

• A) Moves the tool to the drilling depth

• B) Moves the tool to the retract height above the surface

• C) Cancels the drilling cycle

• D) Sets the feed rate