Engineering and Finishing

Shot Blasting

After careful fettling all our castings have the option of being put through our Sisson Lehmann shot blasting machine.

It houses a large rotating table providing an even blast of stainless steel shot to ensure a uniform surface finish. This finish is ideal for powder coating or can be left as a mill finish surface.

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Rumbling and Polishing

Castings that may need to be handled are part of assembly or form part of a decorative item can be rumbled to de-burr the surfaces.

If required, the castings can then be polished to a high mirror shine or be provided with a brushed appearance.

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Powder Coating

Our power coating facility allows us to supply castings painted uniformly. Castings are first shot blasted before being placed in an etching bath.

This means that when we apply the double coating of powder paint we get a perfectly uniform surface finish. We use the highest grades of paint and all RAL colours are available in gloss or matt finishes.

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CNC Machining

To provide a complete one stop engineering solution we can provide completely machined castings using our Haas CNC machining centres.

High precision turning, milling and surface grinding as well as drilling can be undertaken.

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Conventional Machining

Simple conventional machining operations are also easily performed by our skilled machinists. We run 3 lathes and a bank of pillar drills, a horizontal miller, radial drill.

In this department we can provide accurate finishing to your castings with accurate surface finishing and drilled and tapped holes where needed.

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Heat Treatment & Impregnation

We perform heat treatment in a highly controlled environment to ensure that the casting retains its original shape without cracking, sometime known we’ll further guarantee this with a process known as setting.

Heat treatment improves the mechanical and physical properties of castings, primarily to increase the tensile strength and reduce the ductility (stretch) of the metal.

The hardness of the casting is measured on either the Brinell scale or Rockwell scale which are widely recognised standards. Our facilities allow us to perform oil and water quenching as well as vacuum so you can be assured we can meet your needs.

Once the heat treatment has been completed and the castings hardness is confirmed all your parts will be put through a crack detection analysis to check for any defects and only sent to you if they pass.

Additional to the heat treatment process the castings can be subjected to heat with an inert gas such as argon to create a uniform isostatic pressure. The fundamental purpose of this process is to create a casting totally free from porosity.

Alternatively, if you are seeking a guarantee of a porous free casting Impregnation could be a solution. Often valves and pump manufactures will request impregnation as a double measure to ensure castings are free from porosity and it’s a service we are happy to perform.

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Metals

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Aluminium

Aluminium is the most abundant metal on the planet and can be used for a wide range of applications. 

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Copper Alloys

Copper alloys are metal alloys that have copper as their principal component. 

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Iron

The application for cast iron are expansive and we produce small one off architectural or replica castings..  

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Zinc & Lead Alloys

ZA alloys were initially developed for gravity die casting, while Lead has been used for thousands of years.

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