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Graphite End Mill 2 flute ball nose end mill3

Graphite End Mill 2 flute ball nose end mill

Graphite Ball Nose End Mill

SAMHO Diamond-Coated Graphite Ball Nose End Mills R0.5–R6 – Precision Abrasive Machining

Stop letting abrasive materials eat your profits. The SAMHO Graphite Series is specifically engineered for high-precision machining of graphite, ceramics, and brittle non-metallic materials. Featuring a state-of-the-art high-adhesion diamond coating, these 2-flute ball nose cutters deliver a field-proven tool life of over 18 hours.

Target Materials: Optimized for graphite electrodes and electroceramics.
Surface Finish: Ball nose geometry ensures flawless 3D contours and mold cavities.
Extreme Durability: Ultra-fine carbide substrate with chemical-inert diamond plating.
Precision: 5-axis CNC ground to a strict ±0.01 mm dimensional tolerance

In EDM electrode manufacturing and technical ceramics, tool wear is a major challenge. The SAMHO GRAR Series is engineered to excel in abrasive environments, offering a high-performance alternative to standard carbide tools that dull quickly.

Advanced Technical Features

High-Adhesion Diamond Coating for Extreme Longevity
Our proprietary Diamond Coating technology provides extreme hardness and chemical inertness:
- Resist Abrasion: Maintains edge sharpness for extended continuous dry machining
- Prevent Micro-Chipping: Ensures coating stays bonded to the carbide under high-speed friction
Specialized Ball Nose Geometry for 3D Profiling
Precision-hemispherical tip ideal for 3D contours, internal corner transitions, and complex mold cavities:
- Graphite Machining: Smooth, clean-room quality finish on intricate electrodes
- Ceramic Components: High-precision surface finish with zero tool marks
Efficient 2-Flute “Cool-Cut” Design
Sharp dual-flute geometry reduces heat and improves chip evacuation:
- Maximize Chip Evacuation: Rapidly clears abrasive dust from cutting zone
- Reduce Cutting Load: Minimizes heat accumulation and prevents thermal cracking in brittle materials
Ultra-Fine Carbide Substrate & High-Precision Grinding
High-strength micro-grain carbide substrate with 5-axis CNC grinding ensures repeatability and accuracy:
- Dimensional Tolerance: ±0.01 mm for consistent high-volume electrode production
- Fracture Resistance: Improved durability for abrasive applications

Typical Applications

Graphite Machining: EDM electrodes, graphite molds, structural components
Ceramic Machining: Electroceramics, zirconia, and other brittle non-metallic materials
Composites: Milling glass-fiber or carbon-fiber reinforced plastics

Internal Links: → Products / Graphite End Mill / Technical Blogs

Professional Usage Tips

Cooling Strategy: Optimized for dry machining or MQL; use high-volume vacuum suction to remove graphite dust immediately
Precision Setup: Use non-contact measuring devices to protect diamond-coated edges during setup
Rigidity: Employ high-quality shrink-fit or hydraulic holders to maintain ±0.01 mm accuracy and extend tool life

Why Source Wholesale from SAMHO?

Wholesale Savings: Factory-direct pricing for large-scale electrode manufacturers
Proven Performance: Field-tested results outperform standard CVD/DLC coatings
Global Delivery: 20+ specialized models in stock, ready for immediate international shipping

Recommended Materials for Machining (Highly Recommended: ⭐️ | Recommended: ⭕️ | Suggested: ◯)

Category	Work Material	Grade
DIE STEEL	Carbon steels (S45C/S55C)
	Alloy steels (SK/SCM/SUS)
	Prehardened steels (NAK/HPM)
	Hardened steels (~55/~60/~70HRC)
SPECIAL MATERIAL	Aluminum alloys
	Graphite	⭐️
	Copper
	Plastics
	Carbon fiber
	Titanium alloys
	Heat resistant alloys
	Cemented carbide
	Hard brittle (non-metallic) material

Total 20 models

Model Number	Radius of Ball Nose	Length of Cut	Effective Length	Shank Taper Angle	Overall Length	Number of flutes	Shank Diameter	In Stock
GRAR2-0100300	R0.5	3	–	15°	50	2	4	○
GRAR2-0150500	R0.75	5	–	15°	50	2	4	○
GRAR2-0200600	R1	6	–	15°	50	2	4	○
GRAR2-0300600	R1.5	6	–	15°	60	2	3/4	○
GRAR2-0301000	R1.5	10	–	15°	75	2	3/4	○
GRAR2-0301500	R1.5	15	–	15°	100	2	3/4	○
GRAR2-0400800	R2	8	–	–	60	2	4	○
GRAR2-0401000	R2	10	–	–	75	2	4	○
GRAR2-0401500	R2	15	–	–	100	2	4	○
GRAR2-0601200	R3	12	–	–	75	2	6	○
GRAR2-0601500	R3	15	–	–	100	2	6	○
GRAR2-0801800	R4	18	–	–	75	2	6	○
GRAR2-0801800-100	R4	18	–	–	100	2	8	○
GRAR2-0802500	R4	25	–	–	150	2	8	○
GRAR2-1002000	R5	20	–	–	100	2	10	○
GRAR2-1003000	R5	30	–	–	150	2	10	○
GRAR2-1003000-180	R5	30	–	–	180	2	10	○
GRAR2-1203000	R6	30	–	–	100	2	12	○
GRAR2-1203000-150	R6	30	–	–	150	2	12	○
GRAR2-1203000-180	R6	30	–	–	180	2	12	○

Milling Conditions

Work Material		Graphite
Work Material		Roughing				Finishing
(mm)Diameter/Radius	(mm)Overhang	(min-1) Speed	(mm/min) Feed	Ap(mm)	Ae(mm)	(min-1) Speed	(mm/min) Feed	Ap(mm)	Ae(mm)
R0.5	3	22000	800	0.07	0.2	22000	1500	0.1	0.06
R0.75	5	22000	1200	0.15	0.4	22000	1800	0.1	0.06
R1	6	18000	2500∽1800	0.15	0.5	18000	2000	0.1	0.08
R1.5	16∽40	18000∽10000	3500∽2000	0.3	0.9	18000∽10000	3500∽2000	0.1	0.1
R1.5	16∽40	18000∽10000	3500∽2000	0.3	0.9	18000∽10000	3500∽2000	0.1	0.1
R1.5	40∽70	10000∽5500	2000∽1200	0.2	0.7	10000∽5500	2000∽1200	0.1	0.1
R2	16∽40	18000∽10000	3500∽2000	0.4	1.2	18000∽10000	3500∽2000	0.1	0.1
R2	16∽40	18000∽10000	3500∽2000	0.4	1.2	18000∽10000	3500∽2000	0.1	0.1
R2	40∽70	10000∽5500	2000∽1200	0.25	0.8	10000∽5500	2000∽1200	0.1	0.1
R3	24∽36	17000∽10000	3500∽3000	0.6	1.8	17000∽10000	3500∽3000	0.15	0.12
R3	36∽70	10000∽5500	3000∽1600	0.4	1.5	9000∽5500	3000∽1600	0.15	0.12
R4	20∽40	15000∽12000	4000∽3000	0.8	2.5	15000∽12000	4000∽3000	0.18	0.15
R4	40∽70	12000∽6000	3000∽2500	0.8	2.5	12000∽6000	3500∽2500	0.18	0.15
R4	70∽110	6000∽4000	2500∽1200	0.4	1.2	6000∽4000	2500∽1200	0.18	0.15
R5	40∽60	12000∽6000	3500∽2500	1	3	120000∽6000	4000∽2500	0.2	0.2
R5	60∽110	6000∽4000	2500∽1800	0.8	2.5	6000∽4000	2500∽1800	0.2	0.2
R5	110∽150	4000∽2000	1500∽450	0.6	1.9	4000∽2000	1800∽900	0.2	0.2
R6	48∽72	10000∽6000	3500∽2500	1.2	3.6	10000∽6000	4000∽2500	0.2	0.24
R6	72∽110	6000∽4000	2500∽1800	1.2	3.6	6000∽4000	2500∽1800	0.2	0.24
R6	110∽150	4000∽2000	1800∽450	0.9	2.8	4000∽2000	2000∽1000	0.2	0.24

Remark:
*Decrease both spindle speed and feed rate proprotionally when the millingparameters exceed the machine’s maximum spindlespeed;
*Decrease feed rate by 50% when slot machining;
*Recommend air blow.