Ultra-precise boring cartridge and adjustment device therefor
An ultra-precise boring cartridge and an adjustment device is disclosed. The boring cartridge includes a cam, a cam follower contacting the cam by a sloped portion, and a spring arrangement exerting a biasing force against the cam follower. The adjustment device includes a graduated dial affixed to an annular sleeve having a hexagonal-shaped end engaged with the boring cartridge. In an embodiment, a dial of the boring cartridge is rotated in increments of about 3.6° by the adjustment device, which causes movement of about 0.005 mm of the cam in a X-direction and movement of about 0.001 mm of the cam follower in a Y-direction, thereby selectively adjusting a machining radius of a cutting insert mounted on the cam follower.
1. An ultra-precise boring cartridge, comprising:
a housing;
a dial rotationally mounted within the housing;
a cam having a threaded portion, wherein rotation of the dial causes linear movement of the cam;
a cam follower contacting the cam by a sloped portion that is inclined at an angle with respect to a plane parallel to an X-axis; and
a spring arrangement exerting a biasing force against the cam follower,
wherein rotation of the dial in a clockwise direction causes movement of the cam in a first X-direction and movement of the cam follower in a first Y-direction, and
wherein rotation of the dial in a counterclockwise direction causes movement of the cam in a second, opposite X-direction and movement of the cam follower in a second, opposite Y-direction due to the biasing force exerted by the spring arrangement against the cam follower, and
wherein movement of the cam follower in the first and second Y-directions selectively adjusts a machining radius of a cutting insert mounted on the cam follower.
2. The boring cartridge according to claim 1 , wherein the sloped portion has an angle of between about 5° and about 15° with respect to the plane parallel to the X-axis.
3. The boring cartridge according to claim 1 , wherein:
movement of the cam in the first and second X-directions over a first distance causes a movement of the cam follower in the first and second Y-directions, respectively, over a second distance which is smaller than the first distance.
4. The boring cartridge according to claim 3 , wherein movement of the cam of about 0.005 mm in the first and second X-directions causes a movement of the cam follower of about 0.001 mm in the first and second Y-directions, respectively.
5. The boring cartridge according to claim 1 , further comprising a biasing member for providing a biasing force against the cam to eliminate any clearance between the cam and the dial.
6. The boring cartridge according to claim 1 , wherein the spring arrangement comprises a pair of springs separated by a hold pin which prevents movement of the pair of springs in a direction other than the first and second Y-directions.
7. The boring cartridge according to claim 1 , wherein the dial includes a hexagonal-shaped recess accommodating a hexagonal-shaped end of an adjustment device.
8. The boring cartridge according to claim 1 , comprising:
at least one element which applies a preload to the spring arrangement;
wherein the at least one element is stationary with respect to the housing.
9. The boring cartridge according to claim 3 , wherein the second distance is one-fifth of the first distance.
10. The boring cartridge according to claim 6 , wherein the hold pin prevents movement of the pair of springs in either of the first and second X-directions.