The document summarizes a gear tester machine. The gear tester has a master gear mounted on a fixed spindle and a gear to be tested on a movable spindle. The gears are kept in mesh through spring pressure. It works by first setting the dial gauge to zero, then mounting the gears for testing. Variations in the dial gauge readings indicate any irregularities in the tested gear. The gear tester can test gears up to 300mm in diameter with specifications listed. Limitations include reduced sensitivity due to friction in the movable carriage and an inability to clearly identify different types of errors.

1. Prepared by:- Nirav Golani
(IU1241110022)

2. Principle
A master gear is mounted on a fixed vertical
spindle and the gear to be tested on another
similar spindle.
These gears are maintained in mesh by spring
pressure.

3. Construction
The gears are mounted on the two spindles , so that they
are free to rotate without measurable clearance.
The right spindle can be moved along the table and
clamped in any desired position and The right spindle
slide is free to move.

4. Working
At first the dial gauge is set to zero and then both
gears are mounted on spindles
The variation in dial gauge reading are any
irregularities in gear under test.
A recorder is fitted in the form of waved circular
chart.

5. Specifications
Overall size : 800 × 300 × 425 mm.
Max dia. of gear : 300 mm.
Max helix angle : upto 30·.
LC for dial gauge : 0.01 mm.
Max thick. of gear : 30 mm.
Weight : 55 kg (approx).

6. Limitation
Friction in the floating carriage reduces sensitivity
It is not suitable for < 300 mm gear diameter.
Measurements are directly depend upon master
gear.
Error in pitch, helix and tooth thickness are not
clearly identified.

7. Parkinson’s gear tester

8. Thank you