{
    "slug": "grooving-parting-widths",
    "title": "Grooving & Parting Tool Width Selection Chart",
    "description": "Parting and grooving insert widths by diameter per Sandvik, overhang rigidity rules, and standard groove widths for O-rings, retaining rings and thread reliefs.",
    "lang": "en",
    "tables": [
        {
            "caption": "Parting / cut-off insert width by part diameter",
            "columns": [
                "Part diameter D (mm)",
                "Insert width CW (mm)",
                "Min. practical width (mm)",
                "Setup note"
            ],
            "rows": [
                {
                    "Part diameter D (mm)": "D ≤ 10",
                    "Insert width CW (mm)": "1.0",
                    "Min. practical width (mm)": "1.0",
                    "Setup note": "Slender rods and tubes: the smallest width with the sharpest edge, to minimise cutting force and vibration."
                },
                {
                    "Part diameter D (mm)": "10 < D ≤ 25",
                    "Insert width CW (mm)": "1.5",
                    "Min. practical width (mm)": "1.5",
                    "Setup note": "Medium parting; keep the overhang as short as possible."
                },
                {
                    "Part diameter D (mm)": "25 < D ≤ 40",
                    "Insert width CW (mm)": "2.0",
                    "Min. practical width (mm)": "2.0",
                    "Setup note": "Rigid set-up; a 2-edge insert is fine."
                },
                {
                    "Part diameter D (mm)": "40 < D ≤ 50",
                    "Insert width CW (mm)": "2.5",
                    "Min. practical width (mm)": "2.5",
                    "Setup note": "—"
                },
                {
                    "Part diameter D (mm)": "50 < D ≤ 65",
                    "Insert width CW (mm)": "3.0",
                    "Min. practical width (mm)": "3.0",
                    "Setup note": "Deep parting: single-edge insert with a stable spring clamp — insert stability is critical at these forces."
                },
                {
                    "Part diameter D (mm)": "65 < D ≤ 100",
                    "Insert width CW (mm)": "—",
                    "Min. practical width (mm)": "—",
                    "Setup note": "No verified vendor table value; large diameters need a taller blade and stable clamping. Size from the manufacturer catalogue — do not extrapolate."
                },
                {
                    "Part diameter D (mm)": "D > 100",
                    "Insert width CW (mm)": "—",
                    "Min. practical width (mm)": "—",
                    "Setup note": "Sandvik parts diameters up to ≈180 mm with Y-axis CoroCut QD — that is a set-up capability, not a width value."
                }
            ]
        },
        {
            "caption": "External, Face and Internal Grooving",
            "columns": [
                "Grooving type",
                "Width guidance",
                "Main difficulty"
            ],
            "rows": [
                {
                    "Grooving type": "External grooving / parting",
                    "Width guidance": "Standard insert widths 1.0 / 1.5 / 2.0 / 2.5 / 3.0 mm — take the narrowest that carries the groove",
                    "Main difficulty": "Narrower blades cut with less force and waste less material, but they need stable clamping and a short overhang."
                },
                {
                    "Grooving type": "Face grooving",
                    "Width guidance": "No universal width table — the tool path follows the groove curvature",
                    "Main difficulty": "Chip evacuation and the groove bending radius decide the tool path; overhang and vibration are the main difficulties."
                },
                {
                    "Grooving type": "Internal grooving",
                    "Width guidance": "No published diameter-to-width table",
                    "Main difficulty": "Long overhang, chip evacuation, vibration and tool stability; use solid or damped bars with through coolant."
                }
            ]
        },
        {
            "caption": "Standard Groove Widths by Function",
            "columns": [
                "Groove function",
                "Common groove width",
                "Tolerance & related dimensions",
                "Standard"
            ],
            "rows": [
                {
                    "Groove function": "O-ring seal groove, static",
                    "Common groove width": "≈ 1.3–1.9 × cross-section (CS) — CS 1.8 → ≈ 2.3–3.4; CS 2.62 → ≈ 3.4–5.0; CS 3.53 → ≈ 4.6–6.7; CS 5.33 → ≈ 6.9–10.1 (mm)",
                    "Tolerance & related dimensions": "Static squeeze 15–30%; groove-bottom radius R0.1–0.3",
                    "Standard": "ISO 3601-2 / GB/T 3452.3"
                },
                {
                    "Groove function": "Retaining-ring groove, shaft (DIN 471 type)",
                    "Common groove width": "Groove width = ring thickness s — shaft Ø30 → s ≈ 1.5; Ø50 → s ≈ 2.0; Ø100 → s ≈ 3.0 (mm)",
                    "Tolerance & related dimensions": "Shaft Ø30: groove-bottom diameter d3 ≈ 27.5–28.1 mm; width toleranced per the standard table",
                    "Standard": "DIN 471 / GB/T 894.1"
                },
                {
                    "Groove function": "Thread-relief / undercut groove",
                    "Common groove width": "At least the tool cutting width, plus a 0.5–1 mm margin",
                    "Tolerance & related dimensions": "Free tolerance; dimensioned as width × depth or width × diameter",
                    "Standard": "GB/T 3-1997"
                },
                {
                    "Groove function": "Functional / non-standard groove",
                    "Common groove width": "2 / 2.5 / 3 / 4 mm — standard insert widths cut it without custom tooling",
                    "Tolerance & related dimensions": "Designer-defined; check the mating standard if a ring or seal seats in it",
                    "Standard": "Standard insert width ladder (1 / 1.5 / 2 / 2.5 / 3)"
                }
            ]
        },
        {
            "caption": "Overhang, Clamping and Cutting Force",
            "columns": [
                "Rule",
                "Numbers",
                "Practical effect"
            ],
            "rows": [
                {
                    "Rule": "Shorten the overhang before upgrading anything else",
                    "Numbers": "Deflection grows with the cube of overhang: 100 → 80 mm overhang ≈ 0.51× the deflection",
                    "Practical effect": "A shorter overhang beats any insert upgrade at the same width."
                },
                {
                    "Rule": "Y-axis parting raises stiffness",
                    "Numbers": "Y-axis parting: more than 6× the bending stiffness at a 60 mm blade overhang",
                    "Practical effect": "Less vibration and a higher allowable feed."
                },
                {
                    "Rule": "Feed threshold on overhang",
                    "Numbers": "Overhang under 1.5 × blade height (H): recommended feed; beyond it, drop to the low end of the feed band",
                    "Practical effect": "Measure the real overhang before choosing the feed."
                },
                {
                    "Rule": "Clamp the bar long enough",
                    "Numbers": "Bar clamping length ≥ 4 × bar diameter D",
                    "Practical effect": "Shorter clamping lets slender bars whip and pinch the blade."
                },
                {
                    "Rule": "Narrow blade, lower force",
                    "Numbers": "Narrower insert: lower cutting force, less swarf; small widths lower radial force on fragile parts",
                    "Practical effect": "The trade is setup sensitivity — clamp close and keep the overhang short."
                }
            ]
        }
    ]
}