Choosing the right tap can make the difference between a clean, accurate thread and a broken tap stuck halfway down a hole. While all taps do the same basic job — cutting internal threads — the flute design changes how chips are handled, how much cutting force is needed, and which materials and hole types … Read more
If you work anywhere near a lathe, you’ve probably noticed that tool holders aren’t labeled with friendly names like “finishing holder” or “roughing bar.” Instead, you get strings like EWLNR-2525M08 or PDJNL-2525M15 — a jumble of letters and numbers that actually tells you everything about the tool, once you know how to read it. In … Read more
If you work anywhere near a CNC lathe, you’ve handled these three inserts. They look almost identical in a drawer, but each one is built for a different job. Confusing them can mean poor surface finish, broken edges, or a tool that simply can’t cut the way you need it to. In this guide, we’ll … Read more
We’ve covered CNMG120412 (negative diamond) and WNMG080412 (negative trigon). Now let’s decode CCMT09 — a positive insert with a completely different clearance angle, meaning different cutting behavior entirely. C — Shape: 80° Rhombic Same diamond shape as our CNMG insert — “C” indicates an 80° rhombic geometry, marked below. C — Clearance Angle: 7° (Positive … Read more
In our previous article, we broke down CNMG120412 — a diamond-shaped negative insert. This time, we’re decoding WNMG080412, a trigon-shaped insert with a different geometry and trade-offs. Same method: real photos, position by position. W — Shape: Trigon (80° Included Angle) The first letter, “W,” indicates a trigon shape — a three-sided insert with an … Read more
If you’ve ever picked up a box of carbide inserts and stared at a code like CNMG120412 wondering what it actually means, you’re not alone. The ISO 1832 standard gives every turning insert a code built from position-by-position rules shape, angle, tolerance, type, and size — all packed into 9-10 characters. Once you understand the … Read more