21-09-2013, 04:50 PM
MEASUREMENT OF FUNDAMENTAL DIMENSIONS OF A GEAR SPECIMEN USING CONTOUR PROJECTOR
MEASUREMENT OF FUNDAMENTAL.docx (Size: 16.72 KB / Downloads: 26)
Aim:
To measure the fundamental dimensions of a gear using contour (profile) projector.
Apparatus Required:
Contour projector
Gear specimen
Vernier caliper.
Specifications:
Contour projector: Magnification accuracy for contour = ± 0.1 %
Micrometer head: 0 – 25 mm. L.C: 0.01mm.
Contour illuminator: 150/250 W Halogen.
Magnification: 10X, 20X, 50X lenses.
Vernier caliper: Range: L.C:
Procedure:
1. The required magnification adapter is fixed in the contour projector.
2. The gear (specimen) is placed on the glass plate perfectly perpendicular to the lens tube and perfectly focused on the screen.
3. The illumination can be improved by adjusting the height of the condenser lens by shifting the knurled knob with provided at the lamp assembly with a helical cut.
4. The profile (contour) of the gear specimen is traced on a tracing paper fixed on the screen using pencil.
5. Then the addendum and the pitch circle are marked on the image using the theoretical values.
6. Again, the image is fixed on the screen and the other dimensions are measured using the table micrometers fixed on the table on the contour projector.
Result:
The measured gear parameters using contour projector