Machine Lubrication and Cutting Fluids
What is the purpose of machine lubrication?
To prevent corrosion and reduce friction.
What is an example of a safety interlock on a CNC machine?
The door that opens into the work area, if the door is open the machine cannot run a cycle.
What are the increments used for each base line when you work in the imperial measurement system mode?
Inches
What type of material would you use soluble oil or kerosene as a coolant for?
Aluminum
Which G-code specifies imperial measurement system mode?
G20
What is the thickness (rate of flow) of an oil referred to as?
Viscosity
What does the letter address T specify in a CNC program?
Tool index or turret index.
What is the least input increment amount for most turning centers when working in the imperial measurement system?
0.0001 inches
Which M-code turns the coolant on?
M08
In CNC terms, what is the intersection point for the two baselines in the coordinate system called?
The program zero point.
Where is the first place to look for information about lubricating a particular machine?
The lubrication schedule.
What is another name for manual CNC programming?
G-code programming.
In order to perform machining operations on mill-drill machines that are not on center with the X axis, what additional axis must the turning center have?
A Y axis
What is the first thing you do to find out about the health hazards of cutting fluids?
Consult the product's WHMIS information.
Which M-code turns the spindle on in the forward direction?
M03
What is the prime function of a cutting fluid?
To reduce heat.
What are parentheses used for in a CNC program?
To include messages in the program.
What is the axis on a sub-spindle machine that is used to transfer a workpiece commonly called?
The W axis.
What is used to specify the distance from the chuck face to the program zero point along the Z axis?
The work shift value.
In relation to the spindle centerline, which direction is X minus on a CNC lathe?
Toward the spindle centerline.
What type of oil is used mainly for its cooling properties?
Emulsifiable oil
Which G-code specifies constant surface speed spindle mode?
G96
What is the machine origin position called from which all program zero assignments are taken?
The zero return position.
What are three application methods for low volume cutting fluid?
Manual, misters, and compressed air.
In order, what are the three levels of safety priority related to using CNC machine tools?
Personnel safety, machine safety, and workpiece safety.