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  1. Gavin1024

    Questions regarding drilling small holes, and runout.

    Hello! I have a Hamilton sensitive drill press (model A-M) that uses a JT1 tapered (<-- I think) jacobs chuck, and maxes out around 7k rpm. The runout from the shank of a 3mm bit is 0.08 - 0.1mm. The runout of the spindle just above the chuck is 0.01mm. As I said before, I'm not positive of the...
  2. Luiz Fernando Pinto

    pre drilling for holes

    Hello, i made a hole with 10 mm diameter them the final diameter 11mm, my tool became like this and i didnt made the final hole, obviously. Is that because the relation of the diameters was too small?