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Sand casting
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Sand casting



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Sand casting is used to make large parts (typically Iron, but also Bronze, Brass, Aluminum). It is the process where moist bonded or resin coated sand is firmly packed around a wood or metal pattern of the item(s) to be made. The wood and/or metal pattern is then removed and the resulting cavity is filled with the molten metal. Once the cavity is filled the mold undergoes air drying. The mold (s) are then removed to be cut from the gate and runner as individual pieces.

These guidelines of sand casting tolerances apply as a general rule for the mold removed by hand. Closer tolerance can be obtained depending on part design or the use of special procedures or secondary operations such as machining which can increase the cost of the casting and the need for longer production times.

Linear Tolerance: For all functional dimensions the linear tolerance chart below, should be used. For non-functional dimensions, wider casting tolerance will result in a more economical design.

METRIC - Millimeters
Range
Deviation + or -
Tolerance Range
up to 10mm
+/- 1.40
2.80
10 - 16mm
+/- 1.50
3.00
16 - 25mm
+/- 1.60
3.20
25 - 40mm
+/- 1.80
3.60
40 - 63mm
+/- 2.00
4.00
63 - 100mm
+/- 2.20
4.40
100 - 160mm
+/- 2.50
5.00
160 - 250mm
+/- 2.80
5.60
250 - 400mm
+/- 3.10
6.20
1400 - 630mm
+/- 3.50
7.00
630 - 1000mm
+/- 4.00
8.00