Abstract: A multimode testing device is disclosed for automatic testing of a threaded feature on a workpiece, comprised of a housing mounting a forward extending probe tip having an outlet supplied with air pressure via internal passages in the housing. In the first test mode, an obstruction test is made to detect the absence of the threaded feature or the presence of a broken tool, the obstruction test made by advance of the probe tip into the threaded feature. A contact of the probe tip with an obstruction causes blockage of an internal passage and an increase in back pressure therein which is detected by a pressure sensor. If no obstruction is detected, a second test mode is initiated by tilting the probe tip by an air cylinder operated actuator rod formed with cam surfaces interfit with complementary surfaces on a thrust rod mounted to push the probe tip sideways.

Abstract: A boring bar for machining an internal spherical surface. The bar has a cutting element and a holder therefor both of which rotate bodily with the bar and are simultaneously pivotable in a cutting operation about an axis transverse to the rotational axis. At the same time, the portion of the holder carrying the cutting element can be adjusted radially to the transverse axis for precise positioning of the cutting element. Remotely operable actuator mechanisms are provided, one for pivoting the holder to make the cut and the other for making the radial adjustment to set the cutting element initially to the desired radius dimension and subsequently to compensate for wear, the latter mechanism being uniquely constructed and arranged to make the adjustment while the boring bar is still rotating so as not to affect the normal cycle time of the machine and to provide solid support for the cutting element in all adjusted positions thereof.