Workshop Technology
For welding plates of thickness less than 5 mm, its edges

Do not require bevelling
Should have a double-V or U-groove on both sides
Should have a double-V or U-groove on one side
Should be bevelled to a single-V or U-groove

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Workshop Technology
A jolt machine is used to

Ram the sand harder at the back of the mould and softer on the pattern face
Produce uniform sand hardness throughout the mould
Ram the sand harder at the pattern face with decreasing hardness towards the back of the mould
Produce uniform packing of sand in the mould

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