If you want a low cost starting point, try a CCMT OD turning tool holder (SCLCR) and a CCGX insert (Shars.com is a good place to get these from). The larger the nose radius, the greater the required depth of cut and cutting forces, but the better the finish for a given feedrate. A small nose radius will provide tighter tolerance cutting due to reduced forces and allow you take a smaller depth of cut which might be a requirement for your lathe. See how long those last.
The CCGX has polished top face and a quite positive geometry. Because they are ground on the periphery, they are very sharp and tend to do well in soft gummy materials. Cutting oil or coolant are a must as the built up edge will quickly destroy the insert. The insert will cut well at any speed, however you will get the greatest productivity and tool life when running at the Mfg. suggested surface footage (aka. spindle speed). with such a small diameter, this recommended speed may be well beyond the capabilities of your lathe.
If you find that these insert wear out too quickly (not breakage, that's a different problem), then you might want to consider talking to a tooling specialist like Sandvik or Kennametal. They know their products and can recommend a tougher grade of insert probably with a coating to do the job you want. Expect to pay significantly more for this insert.
If you want to learn more, please visit our website Titanium Carbide Insert.
Last but not least is the whole topic of insert nomenclature. It’s a deep subject, one filled with exceptions and cutting tool-specific rules. Regardless, most manufacturers follow the ANSI or ISO tool identification system (and sometimes both). We won’t get into the details here except to say that it uses an alphanumeric code to specifies an insert’s shape (round, square, triangular, etc.), clearance angle (neutral to positive), tolerance (some inserts are pressed to size, while others are ground), the size of the locating hole (if any) and clamping method, its size and thickness, corner radii, and various other defining features (see the chart above for an example).
For more information, please visit Multi-Strand Coupler.
Complex naming systems aside, however, choosing the right insert for your machining application isn’t as difficult as it might appear. That’s because cutting tool manufacturers have developed online tool advisors that walk machinists and programmers through the tool selection process. For example, Kennametal’s NOVO prompts users to answer questions about the metal removal process (milling, turning, or holemaking), the machine tool that will be used, workpiece material and removal amount, and expected depths of cut. It then generates a machining strategy along with insert and toolholder suggestions, ordering information, product availability, feed and speed recommendations, and more.
Long story short, carbide insert selection is much easier than it once was, even though the number of cutting tool options has grown exponentially since the days of brazed carbide and HSS tool bits. Download a catalog, log in to NOVO, or give your local cutting tool representative a call. You’ll be making chips in no time.
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