What SFM should I use for Inconel X-750?

Lakeshore Carbide – General Purpose End Mill Speeds & Feeds lists 100–300 SFM for carbide end mills in the "Monel & High Nickel Steel" row. Start at the low end and adjust for your machine.

What chip load for a 1/2" end mill in Inconel X-750?

The published range for 3/8–1/2" carbide end mills is .0010–.0020" per tooth. At 100 SFM a 3-flute 1/2" end mill runs about 764 RPM and 2.3 IPM.

Are these values for HSS tools, drilling or turning?

The end mill chart covers carbide end mills. The "Speeds by tool material" table adds published HSS, turning-insert and drilling rows for Inconel X-750 where a source lists them (LittleMachineShop, Sandvik Coromant).

Inconel X-750 Speeds and Feeds (Milling, Drilling, Turning)

Carbide end mills in Inconel X-750: 100–300 SFM. Also called Alloy X-750. Chart row used: “Monel & High Nickel Steel” (Aged).

Starting point: carbide end mills

RPM and IPM use the low end of the published range (100 SFM and the lowest chip load for each diameter range). RPM = SFM × 12 ÷ (π × D); IPM = RPM × flutes × chip load.

Inconel X-750 — inch end mills
Diameter	Chip load (in/tooth)	RPM	IPM · 2 flute	IPM · 3 flute
1/8"	.0003	3,056	1.8	2.8
1/4"	.0003	1,528	0.9	1.4
3/8"	.0006	1,019	1.2	1.8
1/2"	.0010	764	1.5	2.3
3/4"	.0015	509	1.5	2.3
1"	.0020	382	1.5	2.3

Inconel X-750 — metric end mills (inch chip-load range the size falls in)
Diameter	Chip load (in/tooth)	RPM	IPM · 2 flute	IPM · 3 flute
3 mm	.0003	3,234	1.9	2.9
6 mm	.0003	1,617	1.0	1.5
10 mm	.0010	970	1.9	2.9
12 mm	.0010	809	1.6	2.4
16 mm	.0015	606	1.8	2.7
20 mm	.0020	485	1.9	2.9

Full published chip-load ranges

1/32-1/8": .0003–.0006"
1/8-1/4": .0003–.0010"
1/4-3/8": .0006–.0015"
3/8-1/2": .0010–.0020"
1/2-3/4": .0015–.0030"
3/4-1": .0020–.0040"

Calculator — prefilled for Inconel X-750

Results for Milling

Spindle RPM: 764
Feed: 3.1 IPM
Chip load: 0.0009 in

MRR: 0.11 in³/min
Power: — HP
Torque: — lbf·ft
Programmed fz: 0.0010 in
Actual SFM: 100
Spindle use: 6%

Pick a material in the library below to estimate spindle power and torque.

Operation Type

Milling

Turning

Material library

Auto-adjust cutting data

Material & condition

Cutting tool material

Tool coating

Tool & coating guidance

Grade, edge geometry and coating determine usable cutting data. Sharp polished edges can suit nonferrous work; substrate and geometry still govern. Coated vs uncoated carbide changes turning data only; no coating speed multiplier is inferred.

Tool & cut parameters

Manual values

SFM (Surface Feet/Min)

Cutter Diameter (in)

Number of Flutes

Axial depth of cut (in)

Feed per Tooth (in)

Machine RPM limit

Chip thinning & cutter body

Cutter body

Chip-thinning compensation

Radial engagement (% of diameter)

Entering angle KAPR (°)

Radial factor ×1.09Angle factor ×1.00Programmed fz 0.0010 inMax chip hex 0.0009 in

Fixed-angle peripheral estimate: hex = fz × radial factor × sin(KAPR). No radial correction at ≥50% engagement. Not a centered face-milling or ball-nose model. Sandvik geometry reference

Insert styles, guidelines & formulas

RPM = (SFM × 12) / (π × D) | Feed = RPM × programmed fz × effective zc | MRR = WOC × DOC × feed | HP = Kp × C × MRR × 1.1 ÷ 0.8 (Machinery's Handbook)

Milling Insert Styles

Square (SEMT/SNMG)

General purpose, 90° lead angle

Round (RPMW/RCKT)

Ramping, 3D contouring, high feed

Triangular (TPMX)

Light cuts, finishing

Octagonal (ONMU)

Face milling; HFM suitability is body-specific

Milling Guidelines

Start at 70% of max SFM, increase gradually
Chip load too low → rubbing & heat buildup
Use climb milling when machine rigidity allows
Radial engagement >50% → reduce feed per tooth
Round inserts: best for ramp-in and 3D surfaces

Open in the full calculator workspace

Speeds by tool material

Published starting ranges for Inconel X-750 by operation and tool material. Rows marked * are estimates.

Inconel X-750 — speeds by tool material
Operation	Tool	SFM	Feed	Source row
milling	Solid carbide end mill	100–300	0.0010–0.0020 in/tooth	Lakeshore Carbide · Monel & High Nickel Steel
milling	Uncoated carbide (H13A)	100–115	0.0040–0.0080 in hex	Sandvik milling (large engagement) · CMC 20.22 Nickel-base superalloy, aged
milling	Coated carbide (GC1030)	95–120	0.0040–0.0080 in hex	Sandvik milling (large engagement) · CMC 20.22 Nickel-base superalloy, aged
turning	Uncoated carbide (H13A)	65–130	0.0040–0.0200 in/rev	Sandvik turning · CMC 20.22 Nickel-base superalloy, aged
turning	Coated carbide (GC1115)	70–215	0.0040–0.0200 in/rev	Sandvik turning · CMC 20.22 Nickel-base superalloy, aged
turning	Ceramic (CC670)	740–1050	0.0040–0.0120 in/rev	Sandvik turning · CMC 20.22 Nickel-base superalloy, aged

Machinist tips

Chip thinning: At light radial engagement (under half the cutter diameter) the real chip is thinner than the feed per tooth. Raise the feed to keep the chip at the chart value, or the tool rubs and wears.
Climb vs conventional: On a rigid CNC, climb mill so each tooth starts thick and exits thin. Use conventional milling on machines with backlash or on hard scale skins.
Heat is the enemy: Use high-pressure coolant, keep engagement consistent, and stay at the low end of the speed range.

Common questions

What SFM should I use for Inconel X-750?: Lakeshore Carbide – General Purpose End Mill Speeds & Feeds lists 100–300 SFM for carbide end mills in the "Monel & High Nickel Steel" row. Start at the low end and adjust for your machine.
What chip load for a 1/2" end mill in Inconel X-750?: The published range for 3/8–1/2" carbide end mills is .0010–.0020" per tooth. At 100 SFM a 3-flute 1/2" end mill runs about 764 RPM and 2.3 IPM.
Are these values for HSS tools, drilling or turning?: The end mill chart covers carbide end mills. The "Speeds by tool material" table adds published HSS, turning-insert and drilling rows for Inconel X-750 where a source lists them (LittleMachineShop, Sandvik Coromant).

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