Modern Machine Shop
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Gardner Business Media is the premier publisher for the heart of manufacturing in North America – providing unique, one-of-a-kind, relevant information of keen interest to the people who power plants, shops and factories. in Cincinnati, Ohio, with the introduction of Modern Machine Shop magazine. To this day, Modern Machine Shop is recognized around the world as the premier metalworking and machin
07/16/2026
There is no standard test for machinability — so job shops must build their own.
A machinability study conducted at Tajmac USA for Nucor's non-leaded 1215 steel, combined with established principles of test-cut design, points to six fundamentals any shop should consider when structuring its own testing:
- Test blind where possible to minimize unintentional bias
- Use realistic parts, not isolated features, to capture real-world performance
- Choose cutting parameters that are aggressive yet sustainable
- Set a baseline before the main study begins — this will require experimentation
- Run tests long enough to differentiate tool wear and support valid extrapolation
- Establish regular measurement intervals rather than stopping continuously to inspect
The core challenge is methodological: without a universal machinability standard, the validity of any test depends entirely on how it is designed.
The principles behind the Nucor study offer a practical framework for approaching that problem with rigor.
Read the full piece for a detailed breakdown of each principle. https://www.mmsonline.com/articles/6-design-tips-for-machining-tests
He wakes up at 5 a.m. to work the farm. By 7, he's running a precision CNC shop that machines die inserts for major automotive OEMs. By evening, he's back in the pasture.
Jeff Lewis has spent his entire life on 380 acres in Cox's Creek, Kentucky — and built Integrity Tool right there on the family cattle farm. This is the story of how a manual mill used to fix broken farm equipment turned into a precision machining operation serving Detroit's biggest names.
Read the full story: https://www.mmsonline.com/articles/a-machine-shop-on-the-farm-he-was-born-on?utm_source=Facebook&utm_campaign=auto&utm_medium=social
07/01/2026
When a lathe cut isn't right despite correct speeds and feeds, the problem is likely rooted in insert geometry.
Tweaking surface footage or feed rate addresses symptoms, not causes. If the chip isn't engaging the insert geometry with enough force, it won't snap — and no parameter adjustment will fix that. The real lever is matching insert geometry to the specific volume of metal being moved.
Four variables govern this system:
- **Insert shape** balances accessibility, strength, and edge economy — from structurally weak V-style profiling inserts to eight-edge SNMG inserts built for heavy roughing loads
- **Rake angle** determines how forces are applied — positive geometries reduce cutting pressure; negative geometries add edge strength and double usable cutting edges
- **Lead angle** distributes impact stress across a longer section of carbide, managing heat and reducing notching in work-hardening materials
- **Nose radius and wiper geometry** govern surface finish, radial force, and chatter risk
Every geometry choice is a negotiation with machine rigidity. Get the physics right, and the numbers will follow.
Read the full breakdown to align these variables into a single, controlled system. https://www.mmsonline.com/articles/beyond-the-dial-why-geometry-is-the-true-limit-of-your-lathe
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