Laser Cutting and Folding

Laser cutting uses a focused beam of light to cut sheet material. Materials that we process include:

  • Mild Steels – 250 and 350 grade
  • Wear plate – Bisalloy 80 and 400
  • Stainless Steel – mill and brushed finishes
  • Aluminium

Lasers provide a very accurate and clean cut in thickness of up to 20mm.  Accuracy is within +/- 0.10 mm and cut edges are crisp, square and free of slag. Laser cutting is ideally suited for sheet metal and light plate processing.  Slots and holes can be cut accurately as well as any internal and external shapes. Once cut, profiles can be pressed and shaped into brackets, covers or boxes. We also offer secondary process such as welding, tapping, machining and surface coatings.

Profile Cutting

Profile cutting involves cutting shapes into sheets and plates.  This is a quick and economical way to remove material and create shapes for fabricated assemblies and to prepare material for subsequent machining.

“Profile cutting generally refers to the cutting of thicker plate material where it is not as economical to laser cut.  As a rule of thumb, thickness greater than 20mm are profile cut. Profile cutting is predominately performed using a hot process such as Flame cutting or Plasma cutting.”

Flame cutting uses flammable gasses and an oxidizer (oxygen) to cut steel. This process can cut up to 300mm thick plate.

Plasma cutting uses an electrical plasma to generate the heat required to cut the material. High definition plasma cutters can rival the cut quality of lasers and can cut up to 50mm thick plate.  As well as cutting steel, plasma cutters can process aluminium and stainless steel.

Secondary processes can be performed during profile cutting, reducing setup times and part costs.  These processes include:

  • Beveling
  • Weld preparations
  • Drilling and tapping of holes
  • Countersinking

Profiles can be cut from templates, sketches and drawings. Materials that can be cut include:

  • AS 3678-250 up to 300mm
  • AS 3678-350 up to 300mm
  • AS 3678-K1042 DURAX K1045 up to 160mm
  • Quenched & Tempered 80 (Bisalloy 80) up to 100mm
  • Quenched & Tempered 400/450 (Bisalloy 400) up to 100mm
  • Quenched & Tempered 500 (Bisalloy 500) up to 100mm
  • Floor plate (checker plate) up to 12mm
  • Other grades including Stainless steel and Aluminium



Anodising is a finishing process for aluminium components.  CNC machined components are often anodised for cosmetic appearance and corrosion resistance.

The anodising process involves creating a thick and durable oxide layer that is porous.  A coloured dye is introduced to these pores and then sealed to create a durable finish.  Clear anodising is done without dye if a colour is not required.

Advantages of anodising:

  • Thicker oxide layer provides better corrosion protection
  • Wide range of colours from clear to black
  • Addition of color does not add to the thickness of the part.  Critical sizes are not altered during the process
  • Hard anodising can be used to create hard wearing surfaces up to 60 Rc
  • Anodised surfaces do not transfer heat as readily as natural aluminium. Handrails and park benches are anodised so that they are not as hot to touch when they have been in the sun.

TNN can make your aluminium part and anodise them to your specifications.  We can also perform post anodising machining and engraving.

Powder Coating

TNN Engineering can organise high quality powder coating to finish your parts to your colour requirements. Powder coating is a very popular surface coating that can be applied to materials that conduct electricity.

The powder is applied to the prepared surfaces using a spray and an electric charge.  This provides a uniform and even coating of paint powder.  The coated parts are then baked to form the final coating.

Powder coating is available in a wide range of colours and 3 finishes including:

  • High Gloss
  • Satin
  • Matt
  • Textured and hammer finishes
  • Simulated anodising finishes

Prior to powder coating the parts are prepared using a blasting process and a primer is applied for corrosion resistance before the final top coat is applied to ensure your colouring will last the test of time.

Heat Treatment and Hardening

Heat Treatment and Hardening is one of the reasons why steel is such a useful and widely used material. The properties of steel can be manipulated and changed using various heat treatment methods. Hardness, toughness, wear resistance and mechanical strength are some of the attributes that can be changed using a heat treatment process.

Heat treatment services that we can apply to your parts include

  • Through hardening
  • Tempering
  • Carburising
  • Case hardening
  • Flame hardening
  • Nitriding
  • Stress relieving
  • De-embrittlement of electroplated parts

Gear Cutting

If your parts require gears, TNN Engineering can manufacture the blanks and arrange precision gear cutting with our preferred suppliers.