315 Flashcards
iron parts are usually made from
castings
what do that 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 workpiece 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 dimension 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
.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 what two degrees
60, 82
to remove burrs in a machine spindle you should use an reamer
tapered
