Machining:

E+F Plastics method of machining plastics is superior since we only machine plastic. Our approach minimizes setup times while improving accuracy and finishes. The experience we have also allows us to nearly eliminate post machining warpage, stress and cosmetic defects commonly found elsewhere. In general, we are able to machine all four sides and the top of a component in one operation including holes, threads, cutouts, counterbores, countersinks, and steps. This eliminates repositioning and results in a much more accurate part. We may have a few questions up front, but you can be sure of getting the product you expect from E+F Plastics.

CNC machining refers to the machining that operates with Computer Numerical Control. CNC machines are programmed with a language commonly referred to as g-code. The program instructs the machine with coordinates through which the cutter (end mill) should pass or the point at which to drill etc., It also controls feed rates and other functions of the CNC machine such as spindle speeds, tool changers, coolant, etc.

CNC machining has many advantages over manual machining. CNC machining produces parts that are very precise and repeatable. CNC machining can produce parts with complex geometries that would virtually impossible to produce with manual machining.

Polishing:

• Flame Polishing uses a hot flame to economically polish a surface and produces a clear finish, especially on acrylics. Flat external surfaces are the most applicable configuration for this method. For polycarbonates, see Vapor Polishing below.

• Vapor Polishing utilizes a special chemical vapor which changes the surface of the plastic, causing it to flow. This method can be used in polishing both internal and external features, including threads and drill holes. Polycarbonate is the most commonly vapor polished material due to its excellent cosmetic appearance. E+F Plastics performs basic vapor polishing as well as optical vapor polishing. When a surface must be completely clear and void of tool marks, scratches, etc., please specify optical vapor polishing. Special equipment is used to avoid chemical vapor contact with the operator.

• Mechanical Polishing This method is most effective on exterior surfaces and can restore surfaces to a optical, window quality state. This is the most labor intensive of the three processes, but the results are excellent.

Welding: there are several types of welding:

• Hot air/Hot gas welding: This type of welding uses hot air (or gas) to heat the plastic surface and melt the welding rod made from the same material. The most common types of welders are stick and extrusion. Some of the materials we weld are: Polypropylene, Polyethylene(low and high density, UHMW), PFA, PVC, PVDF, Teflon, Delrin (Acetal), ABS, Polycarbonate

• Solvent Bonding: In solvent bonding, the solvent is applied to the joint area of one or both components, and the components are then held together in a fixture. While the parts are held together, and being subjected to pressure, the bond cures to form a joint. The pressure and time required depends on the thermoplastic material, the solvent, and the joint design.

Vacuum Forming:

• The process: Vacuum forming is a process that molds sheet plastic into a 3 dimensional shape through vacuum suction and stretching of heated plastic onto a mold. Once the plastic cools, it is removed from the mold and is ready for trimming.
  
  
• Materials: Some plastics that are used in vacuum forming include: Acrylic, ABS, Polyethylene(low and high density, UHMW), Polypropylene (PP), PVC, PETG, Styrene, Noryl.

• Thicknesses: Vacuum forming is used with many thicknesses from as thin as .010 mil thru 3/8" and can provide great strength in its finished moldings. Fairly complex shapes can be achieved with vacuum forming.