Robert Boschgmbh

Ford Global Technolgoies, LLC

Alexander M Stoll

Francis Maslar

Josef Steibl

Mike Roger Girguis

Reece Adams

Reinhard Schirsch

Juergen Bleyer

Wolfgang Hockauf

Amando Jose Jose Sebastian

Waldemar Zielasko

Eckart Schillo

Peter Wilkins

Timothy M Hull

Mike O Thompson

The invention relates to a method for producing and checking a thread arranged in a cylinder head to receive a spark plug. However, the invention also relates to a device for checking the thread introduced into the cylinder head. By defining a starting point of the internal thread to be produced specifically in terms of position thereof within the parent hole by using spark plug parameters, the spark plug will always be aligned with its spark gap oriented toward the injector. For the purpose of checking, use is made of a plug gage, the screw-in thread of which has the parameters of the spark plug thread and with which, by using a measuring face, the position of an extension on the threaded body can be established. The extension simulates the ground electrode of the spark plug.

Method for producing and checking an internal thread

A device for processing a workpiece which, for this purpose, is fixed inside a working space (or enclosure) in a machining center and is processed with the aid of a tool. To remove processing residues, a gas stream is made to flow through working space, which is formed, for this purpose, like a nozzle. So as to improve further the removal of undesired processing residues from working space, without at the same time increasing the performance of the devices generating air stream, the working space is widened after the narrowest cross sectional area, in the flow direction of gas stream, similar to a Laval nozzle, machining center being situated in the region of the greatest flow speed. Because of this arrangement, in addition, an undesired limitation of working space available for machining center may be avoided.

Device for processing a workpiece

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Bergisch Gladbach, Germany

Alexander M Stoll