Technical Specifications

DESIGN AND TECHNICAL SPECIFICATIONS

DESIGN

It is recommended that consultation with the company's project engineers should take place when first designing any component to be produced by the process. Simultaneous engineering of the product can generate savings in lead times and help minimise tooling and development costs. Such involvement is not always possible and the following is offered for guidance.

GENERAL

In general, sharp corners, blind holes, and unnecessary strict tolerances should be avoided while generous internal and external radii, and uniform sections lend themselves to the process.

TOLERANCES

The tolerances in this table are the recommended minimum for functional details. For non functional dimensions, wider tolerances should be considered which will result in a more economic design. In order to obtain the best possible use of tolerances, castings should be dimensioned from datum planes nearest the centre line of the component.

Minimum tolerances for holes are:- Up to 6 mm (0.25") + 0.075 (0.003").
RPC work to BICTA unless specified.

RECOMMENDED LINEAR TOLERANCES

Dimension(mm)	Tolerance	Dimension(inches)	Tolerance
up to 10	+ 0.13	up to 0.5	+ 0.005
10 to 18	+ 0.15	0.5 to 0.75	+ 0.006
18 to 25	+ 0.18	0.75 to 1.00	+ 0.007
25 to 50	+ 0.25	1.00 to 2.00	+ 0.010
50 to 75	+ 0.30	2.00 to 3.00	+ 0.012
75 to 100	+ 0.38	3.00 to 4.00	+ 0.015
100 to 150	+ 0.45	4.00 to 6.00	+ 0.018

For Dimensions in excess of those stated here please contact foundry

ANGLES

A tolerance band of + 0.5º maximum will generally apply for cast angles. However, their accuracy will depend to a large extent on the mass and configuration of adjoining metal sections.

RADII

A normal tolerance for both internal and external fillet radii would be + 0.25 mm ( + .010") of radius.

MECHANICAL STRAIGHTENING AND SIZING OF COMPONENTS

Provided that the configuration and mass of the component permits, tolerances will be held or improved by mechanical sizing.

METALLURGY

Choice of specification, it's composition, mechanical and physical properties, corrosion resistance, type of application, additional process requirements and special treatments will depend on the function of the component and the precise number of castings to be produced.
The foundry is able to cast in the following alloy ranges:-

STEELS

Corrosion and heat resisting in ferritic, martensitic, or austenitic conditions, together with the high strength precipitation hardening alloy steels. Case hardening, nitriding, low and medium carbon, low and medium alloy steels and tool steels.

COPPER ALLOYS

Brasses, bronzes and gun-metals.

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