To drill holes in the mold template, mark, sample, drill holes and then drill holes. For holes with high position accuracy, it is best to align the holes with CNC milling machines or machining centers, and then drill holes by fitters. When drilling, for the via hole with large general tolerance, the hole with the diameter shown in the drawing can be directly drilled at one time; For holes with aperture accuracy requirements, such as pin holes, the bottom hole should be drilled with a smaller bit first. Then replace it with a larger hole, leaving a reaming allowance of about 0. 1mm, and finally screw the hole to the drawing size with a reamer. For threaded holes, it is best to tap with a drilling machine, so that the verticality of tapped threaded holes is much better than that of manual tapping, which is conducive to the final assembly of the mold. For blind holes, we can drill to a certain depth first, instead of drilling to the bottom to prevent the tap from breaking, and then manually drill the hole to the bottom with a double cone. For holes that can be matched, it is best to match them, and don't make holes alone.