Photo AI
Answer any three of the following: (i) Identify three safety features integrated into a milling machine - Leaving Cert Engineering - Question a - 2014
Question a
Answer any three of the following: (i) Identify three safety features integrated into a milling machine. (ii) Describe the formation of a built-up edge on a cuttin... show full transcript
Worked Solution & Example Answer:Answer any three of the following: (i) Identify three safety features integrated into a milling machine - Leaving Cert Engineering - Question a - 2014
Step 1
Identify three safety features integrated into a milling machine.
Answer
Milling machines are equipped with several safety features designed to protect operators. Key safety features include:
- Interlocking Guards: These physical barriers prevent access to moving parts while the machine is operational, ensuring the operator's safety.
- Emergency Stop Buttons: Positioned conveniently, these buttons allow for immediate stopping of the machine in case of an emergency.
- Braking Systems: A reliable braking system rapidly halts the machine’s movements, significantly reducing the risk of accidents caused by momentum.
Step 2
Describe the formation of a built-up edge on a cutting tool.
Answer
A built-up edge (BUE) forms when material being machined adheres to the cutting edge of the tool. This phenomenon typically occurs at high temperatures and pressures, as the heat generated during cutting causes the metal to soften. The BUE can positively impact tool life up to a point but may lead to a poor surface finish if left unchecked, as it alters the intended cutting geometry of the tool. Proper tool materials and cutting conditions can mitigate the formation of a BUE.
Step 3
Outline the purpose of dressing a grinding wheel.
Answer
Dressing a grinding wheel serves several critical purposes to maintain effective grinding performance:
- Restores Cutting Ability: By removing dull or loaded abrasive grains, dressing revitalizes the wheel's sharpness and cutting efficiency.
- Maintains Wheel Shape: Consistent dressing helps retain the wheel's geometry, ensuring precision in the machined parts by preventing unwanted wear and providing a consistent surface finish.