315 Flashcards
Iron parts are usually made from
Castings
What do the last two digits of the SAE steel code indicate?
Percentage of carbon
The ability of a steel to resist cutting and scratching is called
Hardness
The process that eliminates brittleness in a steel is
Tempering
To remove cast iron chips safely from a machine, you should use (a)
Brush
What tool should you use to lay out and measure distances?
Dividers
To prevent cast iron surface plates from rusting, coat them lightly with
Oil
To raise a surface gauge for measuring above its height, support it on (a)
Box parallels
The distance between the centers of two adjacent holes on a bolt circle is the
Chord or pitch chord
You should carry pointed tools in a tote box or in a
Pouch fastened to your belt
The part of a lathe that holds the dead center is called the
Tailstock
To remove a live center from a lathe, you should tap it with a
Knockout bar
For boring operations on a lathe, you should hold the workplece in a
Chuck
What should you use to remove a chuck that screws on a lathe spindle?
Block of wood
To mount a workpiece on a machine table, you should hold it in a
Vise
A view showing a portion of a part cut away is a
Section
The two dimensions of a cylinder are its and its
Diameter….. length
A name for the degree of accuracy needed for a part to function is
Precision
The index line of a micrometer is divided into 40 parts per inch. Each turn of the micrometer thimble moves the spindle
0.025 in
What does a toolmaker use to check the accuracy of gauges?
Gauge blocks
When you grind the end of a high-speed steel tool, the steel
gives of dark red sparks
The surface of the tool shank that supports the cutting tip is the
Base
The proper surface of a wheel to use for grinding high-speed steel tools is the
Face
What does the A represent in a grinding wheel code marked A 60 N 10 V W?
Type of abrasive
The process of cleaning up an uneven edge formed by grinding is called
Honing
The metal column that separates the flutes of a drill is called the
Web
The points of most general purpose twist drills have an included angle of degrees
118
A flaring cup grinding wheel produces a relief that is
Flat
Machine countersinks have an included angle of to degrees
60…. 82
To remove burrs in a machine spindle, you should use a(n) reamer.
Tapered
