Influence of constant feed per tooth via spindle speed adaption on groove quality in micro milling.

Adjustments of the feed per tooth in a spindle with an asynchronous motor and mechanical clamping can lead to reduced groove quality, resulting in increased burr formation, inferior surface quality, and radial run-out during changes in spindle speed. In turn, a constant feed per tooth during milling offers advantages for tools and machining processes. This study aims to optimize groove quality during micro milling with a constant feed per tooth, achieving reduced burr formation, improved surface quality, and the elimination of radial run-out. Experiments were conducted on a tool spindle with a synchronous motor, considering both constant and non-constant feed per tooth. The influence of the toolholder type and tool clamping repeatability was considered. Using the synchronous motor and a constant feed per tooth, a length change of the tool spindle was observed during rotational speed variations due to compression/expansion. This change was absent with a non-constant feed per tooth. No adverse effects on groove quality were found with varying feed per tooth. The results demonstrate that a synchronous motor enhances groove quality during micro milling with varying spindle speeds. Employing a constant feed per tooth requires adjustments in cutting depth to compensate for the observed compression/expansion. [ABSTRACT FROM AUTHOR]