moistening the sand around the edge before removing pattern
Swab is a hemp fiber brush used for moistening the edges of sand mould, which are in contact with the pattern surface, before withdrawing the pattern.
It is also used for coating the liquid blacking on the mould faces in dry sand moulds.
ram the sand harder at the pattern face with decreasing hardness towards the back of the mould
A jolt machine is used to Ram the sand harder at the pattern face with decreasing hardness towards the back of the mould.
sand slinger
In order to produce uniform packing of sand in the moulds a Sand slinger is used.
squeezing machine
In a squeeze machine, there is a squeezer head or a plate which is used as a pressing board to force the sand inside or compress it.
This machine is mostly used for shallow patterns.
These machines are classified as, squeeze machine, sand slinger, jolt-squeeze machine and sand slinger.
give uniform sand hardness throughout the mould
The diaphragm moulding machine is used to Give uniform sand hardness throughout the mould.