Thread grinding employes specially dressed grinding wheels matching the shape of the threads. Because of the generally higher cost of thread grinding method, this usually less productive process is only applied to produce accurate threads or threads in hard materials. The number of passes required results from workpiece particular material specifications and the form, length, and quality of the thread.
Threads are ground by contact between a rotating workpiece and a rotating grinding wheel, that has been shaped to the desired thread form. Depending on the design of the threading wheel, we distinguish between two basic methods: Single-Rib Wheel and Multi-Rib-Wheel thread grinding, resulting in three different processes.
The most versatile method for which the highest accuracy can be obtained.
The single rib wheel is adaptable, by truing, to many different profile configurations.
More productive than single-rib-wheel grinding,
because of the higher material removal rate per pass.
However, the pitch should not exceed 1/8 of the wheel width
and threading against shoulders should be completely avoided.
The most productive thread grinding method;
therefore used for the production of parts in substantial quantities.
The GW is advanced into the rotating WP