Automatic fixture replacement mechanism for machine tool, wherein includes multiple sets of fixtures for installing work pieces to be processed and a movable manipulator for loading fixture; the movable manipulator is installed on a two-dimensional movable mechanism; the movable manipulator is provided with a pull nail that is fastened to the clamp and the fixture is provided with a pin hole matching with the pin. For batch processing of a large number of work pieces with multiple fixtures, the use of movable manipulator to automatically install and unload fixtures can greatly improve the efficiency of processing. The structure of the mechanism and the operation are simple so that it is reliable and easy to be implemented. Hence, it can be widely used in various types of CNC machining centers.

Devices, systems, and methods used to assemble a structural member, such as a floor truss, are disclosed. The systems include a structural member assembly table including a worktable and a drop-down platform pivotably coupled to the worktable. The drop-down platform includes an end datum and a drop-down mechanism coupled to the support surface. The drop-down mechanism is configured to transition the support surface from an operational position to an eject position to drop the end datum below a work surface of the worktable to eject the assembled structural member from the worktable.

An apparatus for processing a workpiece includes a holding table having a holding surface for holding the workpiece thereon, a processing unit for processing the workpiece held on the holding surface of the holding table, and a table cover for covering the holding surface when the workpiece is not held on the holding surface. The table cover has a contact surface for contacting at least the holding surface of the holding table, the contact surface being adhesive in nature.

Automatic fixture replacement mechanism for machine tool, wherein includes multiple sets of fixtures for installing work pieces to be processed and a movable manipulator for loading fixture; the movable manipulator is installed on a two-dimensional movable mechanism; the movable manipulator is provided with a pull nail that is fastened to the clamp and the fixture is provided with a pin hole matching with the pin. For batch processing of a large number of work pieces with multiple fixtures, the use of movable manipulator to automatically install and unload fixtures can greatly improve the efficiency of processing. The structure of the mechanism and the operation are simple so that it is reliable and easy to be implemented. Hence, it can be widely used in various types of CNC machining centers.

A tool for machining splines on a workpiece comprises a base, a first tooth extending radially from the base and a second tooth extending radially from the base. The second tooth is spaced circumferentially from the first tooth. The first tooth has a first height, the second tooth has a second height and the second height is less than the first height. The first tooth tapers from the base to the tip of the first tooth, the second tooth tapers from the base to the tip of the second tooth and the first tooth is identical to the second tooth to the second height.