In order to overcome the drawbacks of both the squeeze and jolt principles of ramming the sand, a combination of squeeze and jolt action is often employed. A jolting action is used to consolidate the sand on the face of the pattern and it is followed by a squeezing action to impart the desired density throughout the mass of the sand.
The Jolt-Squeeze machine is so constructed that both squeeze and jolt actions can be obtained one after the other. A high pressure jolt-squeeze machine is capable of producing molds of maximum hardness, rammed uniformly throughout the flask.
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