Article From: 3/9/2007 Modern Machine Shop, Derek Korn, Senior
Editor Click Image to Enlarge A picosecond laser was used to
machine this micro-mold that measures 2 mm long by 500 microns
wide by 600 microns deep. Here are four common laser drilling
techniques. Single-pulse and percussion offer fast material
removal rates, but trepanning and helical drilling provide
better hole roundness and accuracy. The ability to produce holes
and other features measuring mere microns in size is only one
piece of the micromachining puzzle. Tiny machined elements on
components such as fuel injector nozzles, micro-molds,
spinnerettes and masks for electronics production must also have
clean edges and burr-free finishes to function properly. It is
often important that the machining process does not introduce
heat into a workpiece, which could alter the material’s
properties. Laser technology has long been capable of machining
metals on such a small scale. However, the words “laser
micromachining” paint with a broad brush. Thes