Abstract: An electro-mechanical module comprises a packaged electrical part having a surface which dissipates heat, and a springy frame which overlies that surface. This frame includes a pair of fasteners for catching on the package at two predetermined locations, and the frame has an unstressed state in which the fasteners do not coincide with the two locations. However, the frame is springy enough to be stressed and thereby move the fasteners to the two locations, and thereafter return back towards the unstressed state and catch the fasteners on the package at the two locations. To complete the module, a heat sink rests on the surface and is removably attached to the frame.

Abstract: A given target temperature profile T is produced in a workpiece as it passes through an elongated passageway of a belt furance by the steps of: (1) determining a set of temperature setting TS.sub.X for the belt furnace thermostats which satisfy an equation f(.alpha.,TS.sub.X,CF.sub.Y).apprxeq.T where .alpha. is a set of thermal parameters for the workpiece, CF.sub.Y is a set of correction factors, and f( ) is a function which approximates the temperature of said workpiece based on TS.sub.X,.alpha., and CF.sub.Y ; (2) measuring an actual temperature profile A(TS.sub.X) of the workpiece in the furnace with the heater thermostats at the settings TS.sub.x ; (3) terminating if the measured actual temperature profile A(TS.sub.X) matches the target temperature profile T within a predetermined tolerance; otherwise, (4) determining a new set of correction factors which satisfies an equation f(.alpha.,TS.sub.X,CF.sub.Y)=A(TS.sub.X); and thereafter repeating the above steps.