A redundant positioning table device with six or fewer degrees of freedom having four modular legs extended from a base to a table, each legs being with three levels and the same types of joints. In one embodiment, the bottom joint is planar and active, the middle joint is prismatic and passive, and the top joint is spherical and passive. In another embodiment, the bottom joint is prismatic and passive, the middle joint is planar and active, and the top joint is spherical and passive. Fewer than six degrees of freedom is achieved by reducing the number of degrees of freedom of designated joints.

A redundant positioning table device with six or fewer degrees of freedom having four modular legs extended from a base to a table, each legs being with three levels and the same types of joints. In one embodiment, the bottom joint is planar and active, the middle joint is prismatic and passive, and the top joint is spherical and passive. In another embodiment, the bottom joint is prismatic and passive, the middle joint is planar and active, and the top joint is spherical and passive. Fewer than six degrees of freedom is achieved by reducing the number of degrees of freedom of designated joints.

An elongated T-slot protection device comprising an elongated member having a body, a pair of sidewalls, and a pair of legs. The protection device is placeable into an elongated opening of a T-slot, and covers the elongated opening to prevent debris from entering the T-slot formed in a work surface.

A redundant positioning table device with six or fewer degrees of freedom having four modular legs extended from a base to a table, each legs being with three levels and the same types of joints. In one embodiment, the bottom joint is planar and active, the middle joint is prismatic and passive, and the top joint is spherical and passive. In another embodiment, the bottom joint is prismatic and passive, the middle joint is planar and active, and the top joint is spherical and passive. Fewer than six degrees of freedom is achieved by reducing the number of degrees of freedom of designated joints.

A redundant positioning table device with six or fewer degrees of freedom having four modular legs extended from a base to a table, each legs being with three levels and the same types of joints. In one embodiment, the bottom joint is planar and active, the middle joint is prismatic and passive, and the top joint is spherical and passive. In another embodiment, the bottom joint is prismatic and passive, the middle joint is planar and active, and the top joint is spherical and passive. Fewer than six degrees of freedom is achieved by reducing the number of degrees of freedom of designated joints.

A structural profile includes an outer contour that has at least one longitudinal side and one transverse side. The longitudinal side and the transverse side are transverse to one another. The longitudinal side has a longitudinal-side groove and the transverse side has a transverse-side groove. The grooves each have a respective groove cross section in which a circle is capable of being inscribed. Longitudinal center axes of the grooves are arranged in a common groove plane, and the groove plane is parallel to a longitudinal center plane of the structural profile.

A structural profile includes an outer contour that has at least one longitudinal side and one transverse side. The longitudinal side and the transverse side are transverse to one another. The longitudinal side has a longitudinal-side groove and the transverse side has a transverse-side groove. The grooves each have a respective groove cross section in which a circle is capable of being inscribed. Longitudinal center axes of the grooves are arranged in a common groove plane, and the groove plane is parallel to a longitudinal center plane of the structural profile.

A T-slot mounting and alignment system for non-rigidly mounting a workpiece or fixture to a work-piece positioner table, welding positioner table or machine tool table having one of more T-slots includes a T-dog, a dog nut, at least one bolt, and at least one fastener. The at least one fastener fastens the T-dog to the workpiece or fixture, and a dog stem of the T-dog extends through a guide slot in the workpiece or fixture and into the T-slot in the table. The dog nut mates with the at least one bolt and tightens to engage a distal end of the dog stem, wherein clearance is provided in the assembled structures to prevent the workpiece or fixture from being tightly clamped against the table. Consequently, compensation for misalignments is possible during setup.

The instant-mount aspect of the present invention allows a user to rapidly accurately dismount a mounted CNC calibration device from a CNC work table, and rapidly replace the CNC calibration device to its previously mounted position within 0.0001, in seconds. The alignment aspect of the present invention allows faster and more robust high-accuracy alignment of a CNC calibration device once it is mounted on a CNC work table. The remote nest aspect of the present invention allows rapid re-positioning of a CNC calibration device within a CNC milling machine cabinet in a way that does not disrupt the data connection between the CNC control computer and the CNC calibration device, and allows for utilization of more of the worktable surface during milling operations.

The instant-mount aspect of the present invention allows a user to rapidly accurately dismount a mounted CNC calibration device from a CNC work table, and rapidly replace the CNC calibration device to its previously mounted position within 0.0001, in seconds. The alignment aspect of the present invention allows faster and more robust high-accuracy alignment of a CNC calibration device once it is mounted on a CNC work table. The remote nest aspect of the present invention allows rapid re-positioning of a CNC calibration device within a CNC milling machine cabinet in a way that does not disrupt the data connection between the CNC control computer and the CNC calibration device, and allows for utilization of more of the worktable surface during milling operations.