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Facts About Foam Cutting Wires

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By Carol Smith


A hot wire foam cutter is a special piece of equipment that is used for foam cutting. One example of materials this machine can be utilized to cut is polystyrene foam. It has various components which include a taut metal wire which is thin and is heated via electrical resistance for it to cut through materials. Depending on the make of the machine, the temperature of foam cutting wires normally reaches 200 degrees Celsius or more.

The wire can be made from various materials, but in most cases, it is made from stainless steel or nichrome. The wire can be pre-formed into any shape that one wants to produce. The wire is usually very hot that it does not need to make contact with the material in order to cut it. The material is vaporized prior to making contact with the wire.

A bow or frame with springs can be used to tension the wire. Most individuals have a tendency of preferring a single stainless steel wire strand to nichrome wire if the diameter is supposed to range from 0.008 inches to 0.020 inches. This diameter is appropriate for frame-tensioned cutters. A nickel-based alloy wire Rene 41 is usually preferred for commercial applications. The reason why nickel-based alloy is preferred is that its tensile strength is maintained at cutting temperatures.

This machine is appropriate for cutting several different materials. It is specifically appropriate for cutting through any thermofusible expanded foam. These refer to materials that normally melt at moderately low temperatures. Custom materials, flexible expanded polypropylene foams, polymathacrylimide, extruded polystyrene, and expanded polystyrene blocks are some of the materials that this machine can cut.

There exist various models of these cutters used today. They include, simple manual cutting tables, performed wires, template-guided manual tables, computer numerically controlled cutters, and push through slicers among others. Pre-formed wires are used by attaching them to handles. When in use, the operator needs to guide the wire manually to produced desired shapes. Handheld cutters operate similarly where they are guided by the operator manually so that it cuts freehand shapes.

Hot wire foam cutting tables usually have a horizontal table that is used to secure the foam work piece in place. The wire, which may be horizontal or vertical then cuts through the work piece secured on the table. Hobbyists usually use vertical wires to cut small, but complex shapes like letters. Vertical tables can be utilized to cut prismatic members only.

Horizontal tables are used mostly in packaging and construction industries. The table has tracks on each side for holding the wire. The tracks allow the movement of the wire to happen with a lot of precision. The tracks enable downward and upward motion. Horizontal tables can also produce angular cuts.

Today, CNC capabilities have been integrated into foam cutting. This gives even more capability to cut extremely sophisticated shapes with great accuracy. However, factors like stiffness of races used for supporting end effectors, stepper motors, and backlash of drive systems can affect accuracy. Usually, tensioned wires are held by the end effectors.




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