PATTERN ALLOWANCES

After drawing figures of patterns and writing few lines about patterns.I would like to add about pattern allowances as laid under.

1.Shrikage or contraction allowance
2.Machining or finish allowances
3.Draft or Taper allowance
4.Distortion or camber allowance
5.Shake or rapping allowance
6.Mould wall movement allowance
As explained in the class write few lines with figures.

I have already dictated the following in the class.
Classification of sand.
Preparation of moulding sand.
Preparation of core sand.
Riser,Runner and Gating.
Engineering Materials-Metal, Non-metal, Ferrous & Non-ferrous metals etc.