- The impact value should be quoted in the kgm/cm2.
- If dung test, the’ test piece is not completely broken, the impact value obtained is indefinite. The test, report should state that the test piece was unbroken by so much kgf-m/cm2.
- The longitudinal axis of the test piece should lie in the plane of center of gravity of the hammer.
- The notch should be at right angles to the plane of swing of the centre of the gravity on the hammer.
- The temperature ‘of test piece at the moment of breaking should not differ from the specified temperature by more than ±2°C. The specified temperature is 27°C.
- The notch should be positioned so that its plane of symmetry coincides with the top face of the grips.
- This is ensured by the form of the test pieces and method of grip.
- The test piece should be gripped tightly in the anvil grips.
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Working of Impact Machine
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