Section 5 Unit 2

What mechanism does a universal chuck use to move its jaws?

• Hydraulics

• Pneumatics

• Scroll mechanism

• Individual screw threads

How many jaws does a common universal three-jaw chuck have?

• Two

• Three

• Four

• Six

Which types of workpieces are ideally held in a three-jaw chuck?

• Triangular and square

• Round and hexagonal

• Square and octagonal

• Hexagonal and octagonal

What are two advantages of using a self-centering chuck?

• High precision and fast setup

• Low cost and high durability

• Ability to machine square parts and eccentric parts

• No need for a chuck key and quick jaw adjustment

Which shapes of workpieces can be held properly in a four-jaw chuck?

• Triangular and round

• Square and Triangular

• Square, hexagonal, wound, and irregular-shaped workpieces

• Hexagonal and octagonal

What are three benefits of holding a workpiece between centers?

• High accuracy, easy removal, and flexibility in machining

• Low setup time, high rigidity, and low cost

• Easy clamping, high speed machining, and no need for center holes

• Enhanced safety, universal application, and no need for additional support

What are three potential advantages of using an independent chuck for workholding?

• Versatility, quick setup, off-center holding
• Center holding only
• Long setup time
• Limited holding capacity

What characteristics make a mandrel the ideal workholding device for a workpiece?

• External threading, large diameter, and non-cylindrical shape

• Internal bore, precision requirements, and cylindrical shape

• Lack of bore, irregular shape, and low precision requirement

• Flat surfaces, high rigidity, and heavy weight

Which mandrel is ideal for gripping a workpiece on an odd-sized hole?

• Solid mandrel

• Expansion mandrel

• Custom machined mandrel

• Flex mandrel

What type of tailstock center is commonly used for most lathe operations?

• Dead center

• Live center

• Adjustable center

• Spring center