01-01-2015, 11:14 AM
Drill all the holes at once? Wouldn't that take a huge multi-spindle drilling attachment?
How about a series of drills that would be much sharper and leave nothing more than a thin hairline burr on the exit side of the holes that you could rub off with your finger?
These A1212 drills are an inexpensive slow helix HSS jobber length drill intended for non-ferrous metals (ISO class N) and plastics (ISO class O) materials. They don't "hog in" like regular drills often do in those materials and are ground to a very sharp edge.
Only available in metric sizes, unfortunately, though many of those will be within the tolerance given for many "inch" sized holes. See my attachments.
How about a series of drills that would be much sharper and leave nothing more than a thin hairline burr on the exit side of the holes that you could rub off with your finger?
These A1212 drills are an inexpensive slow helix HSS jobber length drill intended for non-ferrous metals (ISO class N) and plastics (ISO class O) materials. They don't "hog in" like regular drills often do in those materials and are ground to a very sharp edge.
Only available in metric sizes, unfortunately, though many of those will be within the tolerance given for many "inch" sized holes. See my attachments.