Grooving Tools GND Type
Key Points for Facing
Precautions for Groove Expansion Recommended Chipbreakers MG ML GG GL GF GA
Holder Selection
Min. bore diameter
Max. bore diameter
1
2
3
Min. bore diameter
4
F
5
· Select a holder with which the outer diameter of the first groove to be machined is between the maximum and minimum grooving diameters of the holder. · If the machining start point is within the effective work diameter range, the diameter will not be limited for subsequent passes.
· If the first groove is within the effective work diameter range during groove expansion via plunging, the diameter will not be limited for subsequent passes.
Recommended Chipbreakers MG ML RN
Precautions for Traverse Cutting
Considering the rigidity of the holder, we recommend machining from the outside to the inside.
External → Internal
Internal → External
Feed Direction
Feed Direction
Cutting Point
Cutting Point
If machining is performed from the inner to the outer diameter, the wall thickness remaining on the principal force side will become thinner, reducing the rigidity of the holder.
· If the machining start point for traverse face cutting operation is within the effective work diameter range, the work diameter will not be limited for subsequent passes. · Select the lower limit of the recommended cutting conditions for the chipbreaker and lengthen the chips for evacuation. (In face grooving, broken chips easily get stuck in grooves, which causes problems.) · When breaking chips, step feed is required.
Key Points in Internal Diameter Machining
Recommended Chipbreakers ML GL GF
Precautions for Internal Diameter Machining
If the prepared hole diameter is small, use an ML type or GL type low-feed chipbreaker, both of which reduce chip curl diameter, to ensure adequate chip evacuation.
MG
ML
GG
GL
GCMN3004-MG
GCMN3002-ML
GCMN3002-GG
GCMN3002-GL
Part Material: Structural Steel Prepared Hole Diameter: ø25mm Holder: GNDI R2532-T306 Insert: GCM N300 ○-○○ Cutting Conditions: v c = 330 SFM, f = 0.004 IPR, a p = 0.118" Wet
Internal Diameter Machining
External Machining
GG
GG
Chip shapes differ between internal and external machining even under the same cutting conditions.
Part Material: Structural Steel Holder: GNDL R2525M-320, Insert: GCM N3002-GG Cutting Conditions: v c = 330 SFM, f = 0.004 IPR, a
p = .197" Wet
GCMN3002-GG
F31
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