IME 146 FINAL QUESTIONS AND ANSWES
All CNC machines contain three different components, which components are they? -
Answer -Program of Instructions
Processing Equipment
Machine Control Unit
What are the three main ways G & M code can be created for a CNC machine? -
Answer -1. Conversational Programming
2. CAD/CAM Programming
3. Manual Programming
CNC milling G & M code is based off the __________ Coordinate System? - Answer –
Cartesian
Our Haas CNC machines have a __________ loop positioning system? - Answer -
Closed
The system gets feedback from the __________ encoder located inside the servo
motors on the machine. - Answer -Optical
The __________ screw turns rotary motion from the servo motor into linear axis motion
and eliminates __________ in the CNC table drive system. - Answer -Ball; Backlash
True or False:
Fixture offset or work-coordinate systems (WCS) are the same as the world x, y, & z
zero position location in the CNC mill machine. - Answer -False
, True or False:
The tool length offset tells the CNC mill the length the tool is sticking out of the spindle.
This allows the machine to know where the bottom of the tool is located in relation to the
Work Coordinate System. - Answer -True
A __________ code is a preparatory function, it preps the CNC machine for some sort
of motion - Answer -G
An __________ code is a miscellaneous function that causes an action to occur within
the G & M code. - Answer -M
G01 - Answer -Linear Interpolation; Cuts in a straight line
G02 - Answer -Clockwise circular interpolation; cuts in a clockwise arc
G03 - Answer -Counterclockwise circular interpolation; cuts in a counterclockwise arc
The __________ __________ generates the machine specific G & M code for the CNC
machine in the CAD/CAM system. - Answer -Post Process
True or False:
3-axis tool paths move 2 axes simultaneously in one line of CNC code.They drop down
to depth and then move in the X & Y axes. 2½-axis tool paths are for machining
complex surfaces as they follow the surface with the tool by moving all three axes
simultaneously. - Answer -False
What is the most common cause of a mold cavity to not have enough material injected
into it? - Answer -The injection molding machine has the injection pressure set too low
What type of polymers are utilized in the injection molding manufacturing process? -
Answer -Thermoplastic
The __________ connects the mold to the injection molding machine's nozzle and is the
sealing interface between the mold and machine. - Answer -Sprue Bushing
What is the term used to describe an injection event which does not entirely fill the mold
cavity or cavities? - Answer -Short Shot
Sharp internal and sharp external corners are the preferred design of both injection
molds and injection molded parts. This is because the mold is easier to manufacture
and the molded parts are significantly stronger. - Answer -False; Sharp corners can
impede the flow of material, which can cause the cavity to not fill or pack properly,
creating a part with defects.
All CNC machines contain three different components, which components are they? -
Answer -Program of Instructions
Processing Equipment
Machine Control Unit
What are the three main ways G & M code can be created for a CNC machine? -
Answer -1. Conversational Programming
2. CAD/CAM Programming
3. Manual Programming
CNC milling G & M code is based off the __________ Coordinate System? - Answer –
Cartesian
Our Haas CNC machines have a __________ loop positioning system? - Answer -
Closed
The system gets feedback from the __________ encoder located inside the servo
motors on the machine. - Answer -Optical
The __________ screw turns rotary motion from the servo motor into linear axis motion
and eliminates __________ in the CNC table drive system. - Answer -Ball; Backlash
True or False:
Fixture offset or work-coordinate systems (WCS) are the same as the world x, y, & z
zero position location in the CNC mill machine. - Answer -False
, True or False:
The tool length offset tells the CNC mill the length the tool is sticking out of the spindle.
This allows the machine to know where the bottom of the tool is located in relation to the
Work Coordinate System. - Answer -True
A __________ code is a preparatory function, it preps the CNC machine for some sort
of motion - Answer -G
An __________ code is a miscellaneous function that causes an action to occur within
the G & M code. - Answer -M
G01 - Answer -Linear Interpolation; Cuts in a straight line
G02 - Answer -Clockwise circular interpolation; cuts in a clockwise arc
G03 - Answer -Counterclockwise circular interpolation; cuts in a counterclockwise arc
The __________ __________ generates the machine specific G & M code for the CNC
machine in the CAD/CAM system. - Answer -Post Process
True or False:
3-axis tool paths move 2 axes simultaneously in one line of CNC code.They drop down
to depth and then move in the X & Y axes. 2½-axis tool paths are for machining
complex surfaces as they follow the surface with the tool by moving all three axes
simultaneously. - Answer -False
What is the most common cause of a mold cavity to not have enough material injected
into it? - Answer -The injection molding machine has the injection pressure set too low
What type of polymers are utilized in the injection molding manufacturing process? -
Answer -Thermoplastic
The __________ connects the mold to the injection molding machine's nozzle and is the
sealing interface between the mold and machine. - Answer -Sprue Bushing
What is the term used to describe an injection event which does not entirely fill the mold
cavity or cavities? - Answer -Short Shot
Sharp internal and sharp external corners are the preferred design of both injection
molds and injection molded parts. This is because the mold is easier to manufacture
and the molded parts are significantly stronger. - Answer -False; Sharp corners can
impede the flow of material, which can cause the cavity to not fill or pack properly,
creating a part with defects.
