More specifically, the Stirling engine is a closed-cycle regenerative heat engine with a permanently gaseous working fluid A shaper is a type of machine tool that uses linear relative motion between the work piece and a single-point cutting tool
to machine a linear tool path.
To maximize grinding efficiency, metal removal is conducted in a very small width, turning the wheel into the equivalent of a single-point cutting tool
. Users contour-grind time part as if the wheel were being used in machining.
Compounding the problem is the fact that the tap is in effect a single-point cutting tool
. After the first few chamfer teeth, all cutting is performed by the first full tooth, which gives the thread form its final finished shape and size.
Thread rolling is also quicker - taking no more time than one pass of a single-point cutting tool
. It eliminates burns and greatly reduces the need for operator surveillance because there is no cutting edge to wear or chip.