Page 109 - Personal Study Notes (Engineering Metrology - 22342)

Page 109 of 176

3. The fixed carriage is locked at one position. Master gear is mounted on the spindle of
fixed carriage.

4. The movable carriage is spring loaded and it is held towards the fixed carriage, with
the help of spring pressure.

5. Gear under test is mounted on the spindle of movable carriage, such that, master
gear and gear under test, both are in close mesh with each other. A dial gauge indicator
is made to rest against movable carriage.

6. Now, the master gear and gear under test, in mesh, are rotated by hand and dial
gauge readings are observed. If there are no variations observed in readings of dial
gauge indicator then the gear under test is to be perfect.

7. But if variations in dial gauge readings are found and variations fall outside the
permissible limits, then the gear is rejected.

8. Only acceptable gear are sent for assembly due to which unnecessary expenses in
assembly section can be saved.

Q. Explain constant cord method.

Engineering Metrology (Only For Personal Use) 13