Notes from the grinding floor.

Short engineering notes on tool geometry, cutting data and what the inspection reports actually say. Written to be checked, not skimmed.

19 Mar 2025Process notesRecording DC836 in the inspection reportThe series DC836 demonstrates consistent performance in coating wear resistance for drilling applications in steel and stainless steel, with verified dimensional accuracy and repeatable geometry. ## Importance of Accurate Measurement.3 min17 Feb 2023Process notesStarting feeds and speeds, and what they assumePrinted page 59 of the 2026-2027 catalogue gives speed and feed by material. Those numbers are a starting point, not a guarantee.1 min19 Dec 2022Process notesWhy DC426 shows up in inspection failuresThe DC426 series black-coated solid carbide drill is designed for high-precision micro drilling in challenging materials such as steel, stainless steel, copper, and aluminium alloys. ## Series Overview and Key.3 min13 Jan 2022Process notesWhat -0.003 mm means on a 0.03 mm drillThe catalogue states a one-sided -0.003 mm diameter tolerance on the DC326 range. Here is how to read that against a real part number.2 min7 Oct 2021Process notesWhy HDCS636 shows up in inspection failuresThe HDCS636 series demonstrates consistent performance across its diameter range, with key measurements that directly influence tool life and machining efficiency. ## Series Overview and Key Specifications The HDCS636 series.3 min