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 Jun 2026Product notesHow to read a carbide micro drill part numberThe prefix is the grinding series, four digits give the diameter, and the geometry string gives the rest. One example decoded.2 min3 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 min19 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 min28 Aug 2024Product notesFive coatings on standard part numbersUncoated, TiN, black, bronze and DLC. The coating is part of the series code, so it can be filtered before comparing diameters.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 min