2) L3 Principles of Mechanical Manufacturing in engineering

The four dimensions of a centre lathe that determine the maximum size of the components to be machined are what?

• Swing over the bed, length between centres, swing over carriage & spindle hole.

• Swing over the headstock, length between chucks, swing under carriage & spindle hole.

• Swing under the bed, length between centres, swing over carriage & spindle tolerance.

• Swing over and under the saddle, length between headstocks, swing over carriage & spindle hole.

What does this Sketch represent? the wire feed system used on an electrical discharge machine. (Remember this sketch).

• The wire feed control used on an electrical discharge machine.

• The wire feed system used on an mechanical discharge machine.

• The wire feed system used on an electrical discharge machine.

• The wire feed system used on an electrical and mechanical discharge machine.

Which describes a fabricated box structure used on modern machine tools.

• The required sections are cut to any size and formed in a vice to the required shape, then welded together to form the box section base.

• The required sections are cut to form the required shape, then spatter welded together to form the box section base.

• The required sections are cut to size and formed to the required shape, then cement together to form the box section base.

• The required sections are cut to size and formed to the required shape, then welded together to form the box section base.

When fabricating a metal box structure used on modern machine tools, which material could be used?

• Glass fibre

• Low carbon steel

• Carbon fibre

• Fibre glass

Why is steel used on fabricated box structures, choose three?

• Weldability

• Rusting

• Strength

• Forming

• Ease of cutting

The sketch represents a box structure which is used in the manufacture of the bed of which machine?

(Remember this sketch)

• Grinding machine.

• Horizonal milling machine.

• Vertical milling machine.

• Vertical plane machine.

Why is a box structure used in the manufacture of the bed of a grinding machine?

• Rigidity

• Cheap

• Resist or oppose distortion

• Can move

What is the material used to manufacture the structure of a bed of a grinding machine, and why it is used.

• Aluminium, and it's light.

• Cast Iron, and can be cast into shape.

• Low carbon steel, it's cheap.

• High carbon steel, it's expensive.

What type of bolt is this?

(Remember this sketch)

• Useful bolt

• Cone bolt

• Lock tight bolt

• Rag bolt

What three operations are used when using expanding bolts when mounting of machine tools.

• The diameter of the bolt must be large enough to secure the machine to the concrete floor.

• The centre position of the holes is marked 25mm out.

• The centre position of the holes is carefully marked out.

• The diameter of the nut must be large enough to secure the machine to the wooden floor.

• Holes are drilled into the floor with a tipped drill; its diameter must produce a clearance hole and be deep enough for the expanding nut section of the bolt.