Assumptions
Assume a small bore hole with a few mm diameter in a hard plastic plate (e.g. POM), and further assume that after drilling the hole the surface of the plate is grinded with a disk with fine sand paper (e.g. 20 µm mean grit diameter). This would remove a possible larger radius from the edge of the bore hole and sharpen it to a certain extent. How will the final shape of the edge of the bore be affected by the grit diameter?
Questions
- Is it under this conditions reasonable to assume an approximate fillet radius of the bore hole's edge in the same range as the particle radius of sand paper?
- If not, is the expected fillet radius more likely to be larger or smaller than the particle radius?
