lecture 4 drilling and shaping Flashcards
(16 cards)
What is drilling?
A metal cutting process carried out by a rotating cutting tool to make circular holes in solid materials.
What is the tool that makes holes in drilling called?
Drill bit or twist drill.
List the types of drilling machines.
- Portable drilling machine
- Bench drilling machine
- Radial drilling machine
- Pillar drilling machine
- Gang drilling machine
- Multiple drilling machine
What are the main components of a bench drilling machine?
- Vertical main column
- Base
- Moving drill head
- Electric motor
- Variable speed pulley box and spindle feed mechanism
- Work table
What is a radial drilling machine characterized by?
- Drilling head
- Heavy base
- Vertical column
- Horizontal arm
What defines a pillar drilling machine?
A machine with a vertical main column supporting the drill head.
What is a gang drilling machine?
A machine that allows multiple drill bits to operate simultaneously.
What is a multiple drilling machine?
A machine designed to drill multiple holes in a workpiece at the same time.
What are the two main parts of a drill bit?
- The body: consisting of multi spiral grooves (flutes)
- The shank: a straight or tapered section where the drill is clamped
What is the point angle in drilling?
The angle between the cutting edges, generally 118 degrees.
How does the point angle vary with material hardness?
For harder material, larger angles are used.
Define the helix angle in drilling.
The angle formed between a line drawn parallel to the axis of the drill and the edge of the land.
What types of drilling operations are there?
- Reaming
- Tapping
- Countersinking
- Counter boring
- Centering
- Spot facing
- Drilling
- Boring
What is shaping in machining?
A process of machining a flat surface using a reciprocating single-point tool.
What type of machine tool is a shaping machine?
A reciprocating type of machine tool.
List the types of shaping operations.
- Face-top
- Face-side
- Steps
- Slotting
- Keyway
- Dovetail slot
- Spline hub
