CNC Review

Which code activates the workpiece coordinate system?

• G43

• G41

• G17

• G54

Which code directs The program To end and return to start?

• M02

• M99

• M30

• G80

Which of the following answers best identifies a countersink tool?

• A tool used to produce a flat bearing

  surface on a rough, uneven surface.

• A tool used To create an angled bevel

  to remove burrs, aid the start of taps,

  and the entry of dowel pin

• A tool used to cut a larger-diameter

  hole to a specific depth to allow a bolt

  head or nut to sit flush or below the

  part's surface.

• A tool used to cut a tapered opening at

  the beginning of an existing hole to a

  specific depth to allow a flathead screw

  to sit flush or below the part's surface.

• B and D are correct.

Typically done as part of the start up procedure, which is the process of positioning the CNC machining centers axes at a fixed reference position to allow the machine control unit (MCU) to accurately establish/track the tables position?

• Jogging

• Calibrating

• Homing

• Positioning

To utilize an M01 command which mode function would have to be selected?

• Block delete

• Select program

• Optional Stop

• Single block

After roughing an internal pocket, a program stop is utilized in the program so the metal chips can be cleared. What will restart the machine from this point in the program?

• Power up/Restart

• Power on

• Cycle restart

• Reset

Which of the following describes a material safety data sheet (MSDS)?

• MSDS is used to comply with OSHA's hazard communication standard

• It identifies chemicals in a workplace and their recommended uses

• It provides information about safe handling of chemicals and materials

• All of the above describes an MSDS

Select the code to fill in the blank. To change tools on a vertical maching

center from the tool currently in the spindle to tool number 8 using MDI, the machinist would iput

___ T8.

• G96

• M06

• M08

• M02

A part print calls for a workpiece to have a finished length of 2.025". Leaving 0 .100" on the

length for machining operations, what is the le ngth of stock that must be cut?

• 2 -1/16"

• 2 -3/32"

• 2-1/8"

• 2-1/4"

A machinist has just setup a VMC and ran a setup piece for a program that has been proven

and run in the past. The print in the following image shows the desired hole pattern and the

actual hole pattern, which was machined on the setup piece. what is the likely cause of this

situation ?

• The program coordinates are incorrect.

• The work coordinates or fixture offset

  is incorrect.

• The tool offset is incorrect.

• There is an M30 in the program