What Makes Parting Different from Turning
Parting and grooving is not a "thin turning pass." The insert works in a confined slot with two rubbing flanks, radial feed only, zero exit relief on the sides. Heat builds at the nose, swarf has nowhere to go, and any deviation in width tolerance ruins the whole cut-off face. Kingdon's grooving program is built around three non-negotiables: straight and parallel side clearance, controlled curl radius, and symmetrical double-end usable edges.
We cover MGMN / MGGN / GQ / NAG / TF / KG / RD style insert bodies in widths 1.5 / 2.0 / 2.5 / 3.0 / 4.0 / 5.0 / 6.0 mm, lengths 16–26 mm, with G/M/T/DR chip-flow options, left-right neutral, PVD fine-grain carbide for steel/stainless and CVD K-grade for cast iron. Holders and blades (16/20/25 mm shank) are matched in-house so distributors get a complete cut-off system, not loose triangles.
Geometry Logic (not grade talk)
- Side clearance angle kept tight (1.5°–2°) to avoid wander in deep parting, yet enough to prevent friction drag on the groove wall.
- Double-ended design (both noses ground) doubles corners per piece vs single-end turning inserts - core cost argument for high-volume fastener and bar work.
- Chip curl radius tuned by width: narrow 1.5–2.0 mm gets a tight forward curl for small parts; 4–6 mm gets an open C-curl to avoid packing in the slot.
- Neutral hand (N) standard for MGMN; optional L/R for face grooving and internal ring grooves.
- Polished flank option for aluminum/brass and shiny stainless; honed edge for alloy steel and interrupted cutoff of castings.
Where They Go
Bar stock cutoff on automatic lathes, hydraulic hose ferrules, O-ring grooves, circlip slots, valve stem undercuts, bearing lock grooves, turbine disk circumferential slots, Swiss-type micro-parting (1.5–2 mm width), heavy pipe parting (5–6 mm width, low rpm high feed).
|
Type |
Dimensions(mm) |
|||
|
ØI.C |
T |
Фd |
Re |
|
|
GPMN1502K-M |
14.50 |
1.50 |
0.2 |
GPMN1502K-M |
|
GPMN2002K-M |
15.85 |
2.00 |
0.2 |
GPMN2002K-M |
|
GPMN2502K-M |
18.45 |
2.50 |
0.2 |
GPMN2502K-M |
|
GPMN3004K-M |
21.00 |
3.00 |
0.4 |
GPMN3004K-M |
|
GPMN4004K-M |
21.00 |
4.00 |
0.4 |
GPMN4004K-M |
|
GPMN5008K-M |
25.85 |
5.00 |
0.8 |
GPMN5008K-M |
|
GPMN6008K-M |
25.85 |
6.00 |
0.8 |
GPMN6008K-M |
|
GPMN1502K-G |
14.00 |
1.50 |
0.2 |
GPMN1502K-G |
|
GPMN2002K-G |
15.85 |
2.00 |
0.2 |
GPMN2002K-G |
|
GPMN2502K-G |
18.45 |
2.50 |
0.2 |
GPMN2502K-G |
|
GPMN3004K-G |
21.00 |
3.00 |
0.4 |
GPMN3004K-G |
|
GPMN4004K-G |
25.85 |
4.00 |
0.4 |
GPMN4004K-G |
|
GPMN5008K-G |
25.85 |
5.00 |
0.8 |
GPMN5008K-G |
|
GPMN6008K-G |
25.85 |
6.00 |
0.8 |
GPMN6008K-G |
|
GRMN2010K-F |
14.50 |
2.00 |
1 |
GRMN2010K-F |
|
GRMN3015K-F |
17.00 |
3.00 |
1.5 |
GRMN3015K-F |
|
GRMN4020K-F |
22.00 |
4.00 |
2 |
GRMN4020K-F |
|
GRMN5025K-F |
22.00 |
5.00 |
2.5 |
GRMN5025K-F |
|
GRMN6030K-F |
22.00 |
6.00 |
3 |
GRMN6030K-F |
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