Cutting tool including a cutting insert retaining and adjusting mechanism
A cutting tool includes a novel cutting insert retaining and adjusting mechanism. The cutting insert retaining and adjusting mechanism is associated with a recess in the cutting tool and includes a nest slidably mounted in the recess. The nest includes a cutting insert pocket. The cutting insert retaining and adjusting mechanism includes a first wedge adapted to selectively exert pressure on the nest to retain the nest in a desired position in the recess, and a second wedge adapted to selectively exert pressure on a cutting insert positioned in the cutting insert pocket to retain the cutting insert in a desired position. The mechanism further includes an adjustment screw including a first threaded portion and a second threaded portion. The first threaded portion is threadedly disposed in a threaded bore in the cutting tool body, and the second threaded portion is threadedly disposed in a threaded bore in the nest. The first threaded portion has the same handedness but a different thread pitch as the second threaded portion. Rotating the adjustment screw axially slidably advances and retracts the nest in the recess.
1. A cutting tool comprising:
a cutting tool body including at least one recess adapted for mounting a removable cutting insert therein, the recess including two locating surfaces positioned at an acute angle relative to each other; and
a cutting insert retaining and adjusting mechanism associated with the recess and including,
a nest slidably mounted in the recess, the nest including a single cutting insert pocket, wherein the nest further includes a side wall and a bottom wall positioned at an acute angle relative to each other and that engage and slidably move along the two locating surfaces of the recess when the nest is slidably mounted in the recess, wherein only the side wall and the bottom wall of the nest contact the recess of the cutting tool body,
a first wedge adapted to selectively exert pressure on the nest and retain the nest in a desired position in the recess,
a second wedge adapted to selectively exert pressure on a cutting insert positioned in the cutting insert pocket and retain the cutting insert in a desired position, and
an adjustment screw having a first threaded portion and a second threaded portion, the first threaded portion threadedly disposed in a threaded bore in the cutting tool body, the second threaded portion threadedly disposed in a threaded bore in the nest, wherein the first threaded portion has the same handedness but a different thread pitch as the second threaded portion, wherein rotation of the adjustment screw axially slidably linearly advances and retracts the nest in the recess, and wherein the adjustment screw only threadedly engages the cutting tool body and the nest.
2. The cutting tool of claim 1 , wherein the first threaded portion and the second threaded portion have different diameters.
3. The cutting tool of claim 2 , wherein the diameter of the first threaded portion is greater than the diameter of the second threaded portion.
4. The cutting tool of claim 1 , wherein the first threaded portion and the second threaded portion have a fine pitch.
5. The cutting tool of claim 1 , wherein one of the first threaded portion and the second threaded portion includes a #6-40 thread and the other of the first threaded portion and the second threaded portion includes a #10-32 thread.
6. The cutting tool of claim 1 , wherein the cutting tool is one of a milling cutter and a boring tool.
7. The cutting tool of claim 1 , wherein the cutting insert pocket of the nest includes at least three surfaces which are each contacted by surfaces of a cutting insert disposed in the cutting insert pocket of the nest.
8. The cutting tool of claim 1 , wherein the nest is adapted to accommodate a cutting insert shape having a predetermined shape and size.
9. The cutting tool of claim 8 , wherein the nest is removable and replaceable with a different nest adapted to accommodate a cutting insert having a different predetermined shape and size.
10. The cutting tool of claim 1 , wherein the first wedge includes a screw that is rotatable to selectively exert pressure on the nest.
11. The cutting tool of claim 1 , wherein the second wedge includes a screw that is rotatable to selectively exert pressure on a cutting insert disposed in the cutting insert pocket of the nest.
12. The cutting tool of claim 1 , wherein;
the adjustment screw includes a first threaded portion and a second threaded portion, wherein a diameter of the first threaded portion is greater than a diameter of the second threaded portion; and
the threaded bore in the cutting tool body has a diameter greater than the diameter of the second threaded portion of the adjustment screw.
13. The cutting tool of claim 1 , wherein:
the nest is adapted to accommodate a cutting insert having a predetermined shape and includes at least three surfaces which are each contacted by surfaces of the cutting insert disposed in the cutting insert pocket of the nest;
the diameter of the first threaded portion is greater than the diameter of the second threaded portion;
the first wedge includes a screw that is rotatable to selectively exert pressure on the nest; and
the second wedge includes a screw that is rotatable to selectively exert pressure on a cutting insert disposed in the cutting insert pocket of the nest.
14. The cutting tool of claim 13 , wherein the cutting tool is one of a milling cutter and a boring tool.
15. The cutting tool of claim 1 , wherein the side wall and the bottom wall of the nest are positioned relative to one another at an acute angle in the range of 75 to 88 degrees.