Machining Processes: Drilling and Hole-Making

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What is the depth-to-diameter ratio used for?

Determining if it is deep-hole drilling (correct)

Increasing hole accuracy

Reducing tool life

Measuring the diameter of the drill

What are gundrills typically made of?

Cast iron

Brass

Alloy-steel-tubing shank with a solid carbide or carbide-edged tip (correct)

Stainless steel

What is the purpose of a taper shank on drills?

To hold the drill in a taper in the end of the machine tool spindle (correct)

To increase the drilling speed

To reduce the depth-to-diameter ratio

To deliver cutting fluids to the cutting edge

When are gang-drilling machines often used?

In mass production when several related operations must be done on a single part Signup and view all the answers

What is the major feature of a gundrill?

Delivery of coolant through the tool at extremely high pressures Signup and view all the answers

What has resulted in improved hole accuracy, longer life, self-centering action, and increased feed-rate capabilities in recent years?

New drill-point geometries and TiN coatings Signup and view all the answers

What can happen if a high-speed steel (HSS) drill is not reground properly after wear?

The original drill geometry may be lost Signup and view all the answers

What is required to hold straight-shank drills with sizes up to 3/8 -in. diameter?

Some type of drill chuck Signup and view all the answers

What can accelerate early tool failure and degrade the hole-drilling process?

Poor surface conditions Signup and view all the answers

What type of drills are usually used for sizes up to 3/8 -in. diameter?

Straight-shank drills Signup and view all the answers

Machining Processes: Drilling and Hole-Making

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Questions and Answers

What is the depth-to-diameter ratio used for?

What are gundrills typically made of?

What is the purpose of a taper shank on drills?

When are gang-drilling machines often used?

What is the major feature of a gundrill?

What has resulted in improved hole accuracy, longer life, self-centering action, and increased feed-rate capabilities in recent years?

What can happen if a high-speed steel (HSS) drill is not reground properly after wear?

What is required to hold straight-shank drills with sizes up to 3/8 -in. diameter?

What can accelerate early tool failure and degrade the hole-drilling process?

What type of drills are usually used for sizes up to 3/8 -in. diameter?

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