Angle Dekkor & its uses
Angle Dekkor
This
is also a type of auto-collimator. There is an illuminated scale in the focal
plane of the collimating lens. This illuminated scale is projected as a
parallel beam by the collimating lens which after striking a reflector below
the instrument is refocused by the lens in the filed of view of the eyepiece.
In
the field of view of microscope, there is another datum scale fixed across the
center of screen. The reflected image of the illuminated scale is received at
right angle to the fixed scale as shown in fig. Thus the changes in angular
position of the reflector in two planes are indicated by changes in the point
of intersection of the two scales. One division on the scale is calibrated to
read 1 minute.
Uses of Angle Dekkor
(i) Measuring
angle of a component
Angle
dekkor is capable of measuring small variations in angular setting i.e.
determining angular tilt. Angle dekkor is used in combination with angle gauge.
First the angle gauge combination is set up to the nearest known angle of the
component. Now the angle dekkor is set to zero reading on the illuminated scale.
The angle gauge build up is then removed and replaced by the component under test.
Usually a straight edge being used to ensure that there is no change in lateral
positions. The new position of the reflected scale with respect to the fixed
scale gives the angular tilt of the component from the set angle.
(ii) Checking
the slope angle of a V-block
Figure
shows the set up for checking the sloping angle of V block. Initially, a
polished reflector or slip gauge is attached in close contact with the work
surface. By using angle gauge zero reading is obtained in the angle dekkor.
Then the angle maybe calculated by comparing the reading obtained from the
angle dekkor and angle gauge.
(iii) To measure
the angle of cone or Taper gauge
Initially,
the angle dekkor is set for the nominal angle of cone by using angle gauge or
sine bar. The cone is then placed in position with its base resting on the surface
plate. A slip gauge or reflector is attached on the cone since no reflection
can be obtained from the curved surface. Any deviation from these angle will be
noted by the angle dekkor in the eyepiece and indicated
by the shifting of the image of illuminated scale.