Sand casting tolerance

INCHES

± 0.02" up to 6 inches thereafter add 0.002" per inch.

MM

± 0.5mm up to 150.00 thereafter add 0.05mm per 25.0mm.

Sand casting wall thickness

The same sand casting tolerance as above applies to wall thicknesses.

e.g. a 300mm long casting would have a tolerance of ± 0.8 applied to the wall thickness dimension. (± 0.5 + (0.05 x 6) = ± 0.8)

Straightness / Flatness tolerance

For investment castings a flatness tolerance of ± 0.004" / inch (± 0.10 / 25mm) applies.

For sand castings the same principle as for sand cast wall thicknesses as above applies to flatness.

Draft angles

A draft angle of up to 1º will be applied to sand castings where necessary. This will add material to the casting unless otherwise indicated or agreed.

Angular tolerances

An angular tolerance of ± 0.5º will apply to investment castings.

An angular tolerance of ± 1º will apply to sand castings.

Geometric tolerances

These are dependant on the casting configuration and tolerances required. They would need to be discussed at the quotation / order stage.