Using the shrinkage allowances shown below, how much
extra should be added to the mold dimension to get
a cast dimension of 2.5 feet for a cast iron part?
Dimension |
Shrinkage allowance (in/ft) |
Up to 2 feet |
0.125 |
2 to 4 feet |
0.105 |
Over 4 feet |
0.083 |
Material : Cast Iron
Cast dimensions : 2.5 feet
The acceptable shrinkage allowance for 2 feet to 4 feet dimensions is 0.105 in per feet
So the allowance for 1 inch is
Then the final mold dimension for a cast of 2.5 feet dimension must be
= 2.5 + (0.00875*5)+(0.105*2)
= 2.5 +(0.04375+0.21)
=2.5 +0.25375
=2.75375 or 2.75 feet
thus the extra dimension that need to be added is 0.25375
Using the shrinkage allowances shown below, how much extra should be added to the mold dimension...
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