Conventional multi-fluted reamers are guided by their cutting edges. The Shefcut design separates the cutting, guiding, and supporting functions of the tool for maximum advantage.

Because the cutting blade is independent of the tool body, it can be micro-adjusted over a limited range and pre-set to a cut diameter that the tool will then produce with consistent accuracy. Worn cutting blades can be replaced quickly and easily.

Pads that are independent of the cutting blade optimize the guiding and supporting functions of the tool. While the tool is in operation, cutting forces are opposed by pad reaction forces in perfect balance, providing rigid support for the blade edge. Pads can be tailored to suit the application; e.g., for interrupted cuts, piloted operations, etc.

Fine surface finishes

Shefcut produces lower surface finishes than conventional cutting tools. Surface finishes as fine as 0.1 micrometers (4 microinches) Ra or better are attainable in some materials.

The face of the Shefcut blade is highly polished to reduce friction between chip and blade, which in turn reduces the tendency toward edge build-up. The Shefcut blade has a very sharp edge, and the cutting geometry reduces chip thickness. These blade design advantages, along with the rigid support provided to the blade by the guide pads, enable the user to achieve excellent surface finishes.

Accurate sizing and superior bore geometry

The Shefcut tool produces hole geometry that is superior to the hole geometry produced by conventional reamers. Since multifluted reamers are guided by the cutting edges, they inevitably generate a lobed bore geometry (refer to figure 1). The Shefcut design produces better hole geometry due to rigid support of the cutting blade by the guide pads (see figure 2).

Bore tolerances, including straightness and roundness, can usually be held within 5 microns (.0002 inch) using Shefcut tools on typical shop equipment, provided that reasonable care is taken.

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