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Machining Components

 

Considerations

Epoxies and Polyurethanes are, by nature, insulators and are not the best at dissipating the heat generated during machining. Since there are a great number of products available that are formulated to be machinable it is best to use one of these materials for components that will require machining.

One of the major considerations in formulating machinable materials is the type of fillers used in the formulation. Products containing metallic fillers are considerably easier to machine than those containing silica or similar fillers. The amount of filler loading also makes a great deal of difference. The higher the metallic filler content the easier it is to machine the component.

Almost all cast epoxy and polyurethane components are machinable just that some are more difficult to machine than others.

 

General suggestions

  • Control the heat build-up.
  • Use medium to high speeds.
  • Use low feed rates.
  • Use carbide tools (silica fillers are extremely hard on tools).

 

Suggestions for drilling

  • Secure the part to be machined.
  • Use carbide tipped drill bits.
  • Withdraw the drill frequently and allow it to cool.
  • Drill small amounts at a time (slow feed rates).
  • Use medium to fast speeds.
  • Do not allow the resin to heat sufficiently to become gummy as this will cause it to bind.

 

Suggestions for turning (lathe or milling etc.)

  • Secure the work piece.
  • Use high speeds.
  • Use or sharpen tool to provide a small shaving edge (no feather edges).
  • Take off small amounts of material at a time.
  • Keep tool cool.

 

Threading

  • Secure the work piece.
  • Use a tool that is ground to an angle that will produce a shaving action
  • Make several passes to achieve the desired thread.
  • Slightly warming the component being threaded may help.

 

Sawing

  • Secure the work piece.
  • May be done with a saw blade or cut-off wheel.
  • Use diamond or carbide tipped tools.
  • Cool the tool to prevent overheating.

 

Grinding

  • Secure the work piece.
  • Use diamond or carbide wheels.
  • Cool the work piece with water to prevent the part from expanding due to heat.

 

 

Disclaimer
The above information is general in nature and is based solely on experiences by Crosslink Technology Inc. The recommendations provided herein may not be applicable in all situations. They are provided to the recipient as part of our customer service and the user must determine the relevance of the information to his/her application, considering any limitations that may be applicable thereto. Crosslink Technology Inc. does not accept any liability for direct or consequential damages resulting from the the implementations of these recommendations or the use of this information.

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