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Title: Method and apparatus for positioning a plasma arc cutting torch
Abstract:
The positioning method disclosed herein is particularly applicable to a plasma arc cutting torch of the type in which tangential swirl is imparted to an ionizable gas through which the arc discharge takes place. The gas flow is initiated while the torch is in a retracted position and the torch is then advanced toward the workpiece. The vortex pressure is sensed and a signal is generated which is responsive to changes in vortex pressure. The advance of the torch is terminated in response to a change in the signal corresponding to the abrupt drop in the vortex pressure caused by attachment of the vortex to the workpiece.
Other info: Inventors: Couch, Jr., Richard W. (Hanover, NH, US) Bailey, William V. (Hanover, NH, US) Application Number: 846637 Filing Date: 1977-10-31 Publication_date: 1980-05-13 Assignee: Hypertherm, Incorporated (Hanover, NH) Primary Class(es): 219/121.56 219/124.02, 219/124.34 Other Classes: US Patent Ref:
Other Refs:
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