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How to Decide Which Machine to Use When Cutting Foam and the Type of Foam to Cut by Tal Barnea





How to Decide Which Machine to Use When Cutting Foam and the Type of Foam to Cut by
Article Posted: 09/10/2013
Article Views: 116
Articles Written: 9
Word Count: 696
Article Votes: 0
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How to Decide Which Machine to Use When Cutting Foam and the Type of Foam to Cut


 
Manufacturing,Business
There is a vast growth in demand for foam cutting nowadays, especially for fabrication and machining. The demand for foam cutting and machining is essential in various types of industries, including props, sculptures, signs, monuments, displays, prototypes, architectural shapes, crown moldings and wall caps for construction, packaging insulations, wings and so much more.

Companies cutting foam need to use top of the line cutting equipment to offer a wide range of foam cutting services. The cutting can be done either by using a CNC hot wire foam cutter, a CNC router or a CNC laser cutter. The hot wire can cut almost any thickness of foam, and up to 12 feet projects and more; While the laser cutter is cable of cutting very thin cuts (up to ¾”), manufacturing a high-quality surface finish. The CNC router on the other hand uses a machining drilling-like motion to cut any 3D foam cut. The decision of whether to use a laser or a hot wire cutter is based on the type of foam (for example, Polyurethane, also known as PU foam can only be cut with the laser), on the thickness and the size of the foam to be cut.

Most CNC hot wire foam cutters are capable of cutting the following types of foam: EPS foam - Expanded Polystyrene EPP foam – Expanded Polypropylene XPS foam – Extruded Polystyrene

The smaller foam cutters will usually cut wings, fuselages, logos and letters. The medium foam cutters will cut similar shapes to small ones, with the addition of being able to cut crown moldings and trims used in the architectural industries, while the large foam cutting machines are used mostly by construction contractors and large sign manufacturers.

The following types of foam can be cut with the laser cutters and engravers: Polyurethane - Mainly for packaging, insulation and gun cases Polyethylene or EVA foam - For 3D shapes, packaging and tool trays Polystyrene - For packaging, crown moldings, signs and props Polycarbonate (also known as Plexiglas) - For cutting and engraving MDF – For vacuum molding forms. If the materials to be cut are wood or light metals, the use of a CNC router is necessary.

The different cutting machines differ in their dimensions and size, including their effective cutting on the X axis (horizontal) and the Y axis (vertical), their hot wire length, and other features such as cutting speed capabilities, how many blocks of foam can be cut in one single cut and the type of cuts made (tapered or not tapered).

For projects requiring machining foam or fabrication of foam there is a need to use CNC routers or a combo of a CNC hot wire foam cutter with a router system. Full scale racing cars, 3D topographic maps (up to 10’x5’x20” on a single cut), props and art work can all be machined, and foam molds can also be created.

All of the cutting machines are CNC, which means they are controlled by a computer and come with specialized cutting software. The process of cutting the foam involves specialized files that include the shape drawing. For 2D shapes a DXF file is required, while for 3D shapes an STL file is needed, which allows to rotate the shape and see all the angles of it for better accuracy. Once the right file is received, the data is entered into the computer which is connected to the foam cutter, including all the coordinated needed for cutting that specific shape. Upon finishing of cutting the shape needed, it can be sanded to either a rough or a smooth finish, according to the customer’s request. Large scale shapes are made in several pieces, then glued together to make the complete shape. The cut can also be coated with Polyethylene coating, Polyurea and paint it if needed. The end product needs to be durable, strong and long lasting.

Tal is an electrical engineer with over 30 years experience with hardware, software and motion control. He is the owner of Foamlinx LLC Foamlinx LLC designing and manufacturing CNC hot wire foam cutters and CNC routers, and WeCutFoam WeCutFoam providing foam cutting services using his own machinery line.

Related Articles - CNC, hot wire, foam, foam cutter, CNC hot wire foam cutter, foam cutting, foam cutting machinery, laser cutter, laser cutting, machining, signs,

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