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.

3 Apr 2026Application notesWhere DC426 fits in the process sequenceThe series DC426 black-coated solid carbide drill delivers consistent performance in micro drilling applications, with specific geometric and dimensional parameters that directly influence tool life and surface finish. ## Series.3 min26 Jul 2025Application notesAfter the drill: why PCB edges still fail inspectionA clean hole is not the end of the process. Resin overflow, burrs and copper nodules are finishing problems, not drilling problems.2 min15 Jun 2023Application notesWhen a stepped hole needs one pass1,508 stepped and multi-diameter part numbers are already in the record. Here is how their callouts are written and what they replace.2 min30 Mar 2022Application notesWhere HDCS636 fits in the process sequenceThe HDCS636 series TiN-coated left-hand step solid carbide drill delivers precise stepped hole machining with consistent performance across a wide diameter range. ## Series Overview and Application The HDCS636 series.3 min8 Dec 2020Application notesWhere HDC636 fits in the process sequenceThe HDC636 series demonstrates exceptional performance in high-speed PCB and precision drilling applications, with its TiN-coated left-hand solid carbide design enabling reliable and efficient material removal. ## Series Overview and.3 min30 Nov 2020Application notesChoosing a grit sequence for metal finishing18 finishing families cover 24# to 5000#. The sequence depends on the defect, the alloy and whether the surface is flat or contoured.2 min