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The model car wheel shown is to be turned on a centre lathe - Leaving Cert Engineering - Question 6 - 2009
Question 6
The model car wheel shown is to be turned on a centre lathe. Name three turning operations used in the production of the car wheel. (i) Describe any one of the foll... show full transcript
Worked Solution & Example Answer:The model car wheel shown is to be turned on a centre lathe - Leaving Cert Engineering - Question 6 - 2009
Step 1
Name three turning operations used in the production of the car wheel.
Answer
- Knurling: This process creates a textured pattern on the surface of the wheel, enhancing grip.
- Parallel Turning: This operation enables the wheel to achieve a uniform cylindrical shape.
- Facing / Surfacing: This involves machining the end of the wheel to ensure a flat surface.
Step 2
Describe any one of the following work holding methods used on the lathe: Four jaw independent chuck.
Answer
The Four Jaw Independent Chuck consists of four jaws that can be adjusted independently to hold workpieces of various shapes and sizes. Each jaw is controlled separately, allowing for greater versatility, especially with irregularly shaped pieces. Care should be taken to ensure that excessive speeds are not used while machining, as this can lead to inaccuracies and potential hazards.
Step 3
State a suitable safety precaution to be observed for the work holding method selected at 6(b)(i).
Answer
It is crucial to always ensure that the supporting fingers of the four jaw chuck are lubricated and adjusted properly to avoid overheating during the machining process. Additionally, operators should verify that the workpiece is securely clamped before starting any operation.
Step 4
In relation to machining, describe any two of the following terms: Rake angle.
Answer
The Rake Angle is the angle formed between the cutting edge of the tool and the surface of the workpiece being cut. Its purpose is to allow chips to escape more freely, thus reducing friction and improving cutting efficiency. A larger rake angle typically results in reduced force requirements for cutting.
Step 5
In relation to machining, describe any two of the following terms: Coolant.
Answer
The Coolant is a fluid used to keep the cutting tool and workpiece at an optimum temperature during machining operations. It serves to reduce friction between the cutting tool and the workpiece, which enhances surface finishing and prolongs tool life.
Step 6
Explain any two the following CNC lathe terms: Safety switch.
Answer
The Safety Switch is a critical component in CNC operation. It acts as a preventative measure to ensure that the machine does not start operating unless the safety guard is properly closed. This protects operators from potential hazards related to moving parts.
Step 7
Explain any two the following CNC lathe terms: G code.
Answer
The G Code is a language used in CNC programming to control the movements of the tool. Each command is represented by a G followed by a number, such as G01, which instructs the machine to perform linear interpolation at a specified feed rate.