How to find the right Parting Inserts AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Parting Inserts
- Blade or holder system
- The insert must match the blade or holder family and seat size, for example GTN inserts in self-grip (SGIH/SGTBN) blades, MGMN inserts in MGEHR holders, or a brand's own system such as Iscar Do-Grip or Sandvik CoroCut. Parting inserts are clamped by the blade's own geometry. A mismatch slips, chatters or breaks.
- Cutting width
- Use the width the seat is made for, and pick the narrowest width that is still rigid enough for the diameter you are parting. A narrow insert cuts with less force and wastes less material but deflects more. A wide insert is stiffer but needs more power.
- Neutral vs angled edge
- Use a neutral (0°) edge for general parting. Use a left- or right-hand angled edge only to reduce the pip or burr on the part that falls off. Angled edges push the insert sideways and can wander or cut concave faces on light machines.
- ISO material grade and chipbreaker
- Match the grade (P, M, K or N) and choose a chipbreaker that narrows the chip and suits your feed rate. Parting fails when chips jam in the slot. The chipbreaker controls chip width more than speed does.
- Center height
- Set the cutting edge on the spindle centerline. An edge that is too low or too high leaves a pip or breaks the insert at the end of the cut.
Brands that matter
- Iscar: Originator of widely used self-grip and Do-Grip parting systems.
- Sandvik Coromant: CoroCut parting systems for production lathes.
- Kennametal: Industrial grooving and parting systems with a broad choice of grades.
- Seco Tools: Industrial parting and grooving systems.
- Korloy: Widely available grooving and parting inserts at mid-tier quality.
- Tungaloy: Parting systems with good chip control.
What to avoid
- Parting with a long blade overhang. Keep the stick-out just past the part radius.
- Generic inserts with no stated grade, especially for stainless or hardened steels.
- Angled inserts on low-rigidity hobby lathes unless you specifically need a pip-free face.
- Forcing an insert of a different width or seat size into a blade.
Questions
Will GTN or MGMN inserts fit my holder?
Only if the holder is that system. GTN-style inserts fit self-grip blades of the matching seat size, and MGMN inserts fit MGEHR-style holders. The two are not interchangeable.