Surface Plate
It is used for testing the flatness, trueness of the
surfaces. It is made up of cast iron or graphite. Its upper face is planed to
form a very smooth surface. It is also used in scribing work.
While not in use, it should be covered with a wooden cover.
Angle Plate
It is made up of cast iron in different sizes; it has two
planed surfaces at right angles to each other and has various slots in each
surface to hold the work by means of bolts and clamps.
Never do hammering on the angle plate to fasten (lighten) the
nuts and bolts.
Scriber and Surface Gauge
It consists of a cast iron bass on the center of which a
steel rod is fixed vertically. Scriber is made up of high carbon steel and is
hardened from the front edge. It is used for locating the centres of round bars
or for marking of the lines.
Punches
Punches are used for marking purposes. Dot punches are used
for marking dotted line and centre punch is used to mark the centre of hole
before drilling. Punches are made up of high carbon steel or high speed steels.
One end is sharpened. Hammering is done on the second end while working. For
dot punch, angle of the punching end is 60 degree while in centre punch; angle
of punching end is 90 degree.
Try Square
It is used for checking squareness of two surfaces. It
consists of a blade made up of steel, which is attached to a base at 90 degree.
The base is made up of cast iron or steel. It is also used to mark the right
angles and measuring straightness of surfaces. Never use try square as a
hammer.
Vernier Height gauge:
A Vernier height gauge consists of a heavy base, a graduated
beam, a sliding head with Vernier sliding jaws holding the scriber and a fine
adjustment clamp. It is similar to large Vernier calipers in construction,
except that it consists of a heavy base which allows the gauge to stand upright
instead of a fixed jaw in a Vernier. The movable jaw of Vernier height gauge
consists of a projection or extension which is levelled to sharp edge for scribing
lines at any required height.
#heightgauge #square #punches #scriber #surfacegauge #angleplate #surfaceplate
#heightgauge #square #punches #scriber #surfacegauge #angleplate #surfaceplate
#heightgauge #square #punches #scriber #surfacegauge #angleplate #surfaceplate
