Machine Processes Section 4 unit 2

Which would be the best work holding device for holding 1"-diameter X 6"-long shaft so that a cross hole for a grease fitting could be drilled?

A V-block

If 50 parts measuring 1" X 1" X 3" each needed a hole drilled in a side, which work holding device would be best?

An angle plate

What is the major difference between counterboring and spotfacing?

Counterbores are used to create a smooth, flat enlargement on the opening of an existing hole. Spotfacing is most often used on parts that have been manufactured from a casting process.

What are the two main materials used to make hole making cutting tools?

High-speed steel and Tungsten carbide.

How might an interruption such as a key way influence the selection of a reamer?

It would influence the selection of a reamer because a spiral flute can span the interruption and minimize tool vibration.

Name three functions of the flutes on a twist drill.

The flutes create the cutting lips, they provide a pathway for chips to flow out of the hole and allow cutting fluid to flow into the hole to help cool and lubricate the cutting lips.

Which would be the best work holding device for holding a 3/4" X 12" X 14" flat plate for drilling a series of holes through the large surface of the plate.

angle plate

What must be used to secure a workpiece to an angle plate?

clamps

Which would be the best work holding device for holding 1/2" X 8" X 8" flat plate for drilling a hole in it's edge?

drill press vise

What devices are used to elevate a workpiece to prevent drilling into the machine table or vise bed?

parallels or blocks

Name two types of flute styles for machine reamers.

straight flutes and helical flutes

What two types of shanks are commonly found on twist drills?

straight shank and taper shank