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Two manual three-jaw chuck action principles (wire and helical)

Update:08-03-2019
Summary:

The principle of the helical toothed slider manual chuc […]

The principle of the helical toothed slider manual chuck: the top of the three sliders on the outside of the chuck has helical teeth, which form a beveled engagement relationship with the oblique teeth on the top of the claw; there are three uniformly arranged on the chuck disk body. The chute, the direction of the chute and the radial direction; when the three sliders move within the chute, the movement of the slider is converted into the radial direction of the claw through the engagement of the top of the slider with the helical teeth at the top of the claw Move, clamp or loosen the workpiece. The helical toothed slider type manual chuck has a claw quick change mechanism. If the claw is pulled out according to the button at the rear of the chuck, all the claws can be replaced in one minute, and the clamping diameter can be changed in a few seconds. .

The driving process of the claw on the helical toothed type manual chuck is as follows: the screw is rotated by the chuck key, and the screw rod drives the slider 1 to move in the sliding slot, and the slider also drives the other two through the synchronous disk The slider moves to keep the three sliders synchronized, and the three sliders are released/clamped.

Review of the wire type manual chuck structure:

When one of the three driving small bevel gears is rotated by the chuck key, the large bevel gear meshed with the small bevel gear gradually rotates, the front surface of the large bevel gear is a flat thread (equal thread), and the plane threads mesh with each other. The claws move in a centripetal or centrifugal manner in accordance with the rotation of the planar thread, thereby achieving clamping/releasing of the workpiece.

Comparison of two kinds of chucks: the moving direction of the slider of the helical toothed type manual chuck is perpendicular to the centrifugal force direction of the claw, and the oblique teeth at the top of the slider are in surface contact with the helical teeth at the top of the claw, so the chuck The clamping force is large, and the clamping force is very small due to the centrifugal force, which can be used in high working speed applications. Quite with the disc-type manual chuck that we often use, the helical-tooth slider chuck is more and more convenient to disassemble, and the clamping force and repeatability are much better, and it can be used in high-speed applications. However, the price is more expensive and the structure is complicated.