Roughing cutter
AssigneeColt Industries Operating Corp.
InventorAnthony D. Parone
Life of this patent
Estimating the term…
Abstract
A roughing cutter has a generally cylindrical shank with a plurality of lands and angular flutes separating the lands. A plurality of straight-crested cutting teeth are formed on the lands with radial relief. Each tooth has a straight cutting edge generally perpendicular to the radial direction. The orientation of the cutting edge permits it to be in parallel relationship to a surface of a workpiece while in cutting engagement. This results in a smoother finish than would otherwise be possible. The teeth of the roughing cutter may be cut by an axially advancing milling cutter with a sloping cutting edge.
Claims2
A roughing cutter comprising:
- a generally cylindrical shank having a plurality of lands and angular flutes separating the lands, a plurality of straight-crested cutting teeth formed on each of the lands with selected lead angle formed between the teeth of adjacent lands, each tooth having radial relief and a cutting face at its advancing end with a leading point and a trailing point, each cutting face having a straight cutting edge defined between the leading and trailing points such that the cutting edge of each tooth is substantially perpendicular to a radial line from the axis of the shank to the leading point thereto.
A method of making a roughing cutter having straight-crested, radially relieved teeth with tangential cutting edges comprising:
- providing a shank having lands and angular flutes separating the lands;
- providing a milling cutter with a cutting edge having a straight segment which forms an angle with the axis thereof for machining the crests of the teeth and at least one segment which defines a projection for simultaneously machining the grooves between the teeth;
- rotating the shank about its axis
- rotating the milling cutter about an axis of rotation generally parallel to the axis of the shank;
- and
- bidirectionally moving the milling cutter transversely of the shank during the rotating of the shank and the milling cutter in order to cut the teeth while simultaneously changing the relative axial positions of the milling cutter and the shank so that the teeth on successive lands may be staggered.
Dependencies are inferred from the claim text.