In the hypodermic needle grinding process the needle tip is ground from solid material in one pass. The medical sector often requires the grinding of extremely high-alloy, stainless steel materials.
The freedom from burrs is one of the most important criteria for this process
Besides the tool service life of the grinding wheel, the freedom from burrs is one of the most important criteria for this process. I.e. the cutting edges (outside) and rims (inside) produced by the grinding process should not contain any kind of burr, as this can result in increased pain for the patient when the needle is used and "fraying" of the edges of the injection site, which, in turn, would unnecessarily prolong the healing of the wound.
A suitable choice for this grinding process would be resin-bonded silicon carbide grinding wheels with a grit size between 400 and 600.