Abstract: An edge trimmed piece that is cut from a long metal slab with a cutting torch carried along the slab edge is automatically crosscut into short manageable length pieces with a secondary crosscutting torch. Both torches are mounted on the same carriage and the crosscutting torch is periodically activated to move along an acute angular path with respect to the edge trim cut, resulting in an effective crosscut transverse to the main trim cut. The crosscutting operation may be carried out without interruption of the edge trim torch, thereby enhancing productivity and trim cut quality.

Abstract: A program controlled metal cutting torch includes a torch height control system that utilizes a vibration sensor, such as an accelerometer, to provide a signal indicating torch tip contact with the metal workpiece to facilitate an initial height sensing routine or inadvertent torch contact with an obstruction as the torch moves horizontally during its programmed cutting process. In either instance, the vibration signal representative of torch contact is processed to stop the torch drive device and to raise the torch to the proper predetermined height.

Abstract: A breakaway mechanism for supporting a non-contact tool to protect the tool in the event of an inadvertent collision includes a non-redundant locating system to establish precise tool repositioning and a magnetic holding device to retain the tool in its operative attached position. The non-redundant locating system assures initial mounting and relocating after breakaway which is immune from inaccuracies resulting from manufacturing tolerances and the magnetic mounting device permits breakaway separation free from any mechanical restraint. The invention is particularly suitable for use on an automatic metal cutting torch, but may be applied to many non-contact tools which are positioned and operated by computer or robotic control.