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(a) Answer any three of the following: (i) Identify two safety precautions that reduce the formation of a built-up edge while turning on a centre lathe; (ii) Distinguish between oblique cutting and orthogonal cutting; (iii) Explain one main function of a feeler gauge; (iv) Describe the main features of a Morse taper sleeve; (v) State the function of a reamer - Leaving Cert Engineering - Question 7 - 2011
Question 7
(a) Answer any three of the following: (i) Identify two safety precautions that reduce the formation of a built-up edge while turning on a centre lathe; (ii) Disti... show full transcript
Worked Solution & Example Answer:(a) Answer any three of the following: (i) Identify two safety precautions that reduce the formation of a built-up edge while turning on a centre lathe; (ii) Distinguish between oblique cutting and orthogonal cutting; (iii) Explain one main function of a feeler gauge; (iv) Describe the main features of a Morse taper sleeve; (v) State the function of a reamer - Leaving Cert Engineering - Question 7 - 2011
Step 1
Identify two safety precautions that reduce the formation of a built-up edge while turning on a centre lathe
Answer
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Use Cutting Fluids: Applying appropriate cutting fluids during machining minimizes friction and heat, helping to reduce the formation of built-up edges.
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Correct Tool Selection: Choosing suitable cutting tools enhances the cutting process, thereby preventing the creation of built-up edges.
Step 2
Distinguish between oblique cutting and orthogonal cutting
Answer
In orthogonal cutting, there are two primary forces acting on the cutting tool: tangential force (cutting force) and axial force (thrust), leading to constant cutting conditions and chip formation. In contrast, oblique cutting involves a radial force in addition to the tangential force, which allows the chip to be ejected more effectively as the cutting edge enters the material at an angle.
Step 3
Step 4
Outline two reasons for using tungsten carbide cutting tools rather than high-speed steel cutting tools
Answer
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Heat Resistance: Tungsten carbide retains its cutting edge at high temperatures better than high-speed steel, allowing for higher cutting speeds and longer tool life.
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Durability: Tungsten carbide tools are more durable and resistant to wear, providing a more consistent machining performance over time.
Step 5
Explain one advantage of using interchangeable tool inserts
Answer
Interchangeable tool inserts allow for quick changeover in machining operations, reducing downtime and increasing productivity. Operators can easily replace worn inserts without needing to change the entire cutting tool, which ensures streamlined machining.
Step 6
Describe, with the aid of diagrams, a suitable cutting operation for each of the milling cutters shown
Answer
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Slot Drill: The slot drill has cutting edges on the end and along the helical sides, allowing it to create slots and grooves in a workpiece effectively. It operates by plunging into the material to create a centered slot.
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Dovetail Cutter: The dovetail cutter is used to create dovetail profiles on machine parts, which are essential for ensuring proper fitting and alignment in the assembly of components.