Machine Processes Section 8 unit 1

Explain the benefits of using the incremental programming system versus the absolute system.

The advantage of using the incremental system is that parts requiring repetitive motions can be easily computed and programmed.

Supposing a programmer, using absolute mode, mistakenly entered Z-3.689, when he or she intended to enter Z3.689. Describe what would happen, and how far the actual position would be from the intended position.

The positioning move will be made 7.378 inches away from where it was intended.

What is the name of the character that ends each line of code?

end of block character

What is the name for the type of motor used to drive CNC axes that is also capable of recording axis position?

A servo motor

List the four G-codes and describe their functions.

G0: positioning at rapid feed G1: linear interpolation G2: circular interpolation-clockwise G3: circular interpolation- counterclockwise

List the four M-codes and describe their functions.

M00: program stop M01: optional program stop M02: program end M03: spindle on clockwise

Explain the purpose of the safe-start portion of a CNC program.

the safe start section is done to make sure that no modal codes are active for the next program.

Briefly describe a ball screw and a linear guide.

A ball screw consists of a screw and nut assembly with steel balls in place of threads. Linear guides are sealed units, they have pressurized lubrication systems, and contain low friction ball bearings.

Explain the benefits of using the absolute programming system versus the incremental system.

A disadvantage to using the incremental system is that errors accumulate.

What is an MCU and what is it's function?

Machine control unit, computer that runs the machine

Which coordinate system uses an angle and a distance to identify a position?

The incremental system

What is an ATC?

automatic tool changer

What is a modal code?

codes that remain active until cancelled or overridden.

What is another name for the Cartesian coordinate system?

rectangular coordinate system