CNC Speeds and Feeds Calculator

Inputs

Material

Cutting speed comes from our cited cutting-speed table below.

Tool material

Carbide tools run roughly two to four times the cutting speed of high-speed steel.

Tool diameter (D)

Cutting diameter of the end mill or router bit.

Flutes (Z)

Number of cutting edges (teeth) on the tool.

flutes

Chip load (fz)

Feed per tooth — the chip thickness each cutting edge takes per revolution.

Axial depth of cut (ap)

Depth of cut along the tool axis (how deep each pass goes).

Radial width of cut (ae)

Width of engagement (stepover) across the tool.

Default result

Spindle speed(n)

7,762rpm

Pass

Also computed

Feed rate(Vf)776.2mm/min

Cutting speed(Vc)243.8m/min

Surface speed from the material table.

Feed per rev(f)0.1mm

fz × flutes.

Material removal rate(Q)7.762cm³/min

ap × ae × feed rate.

Method notes 5 notes

Cutting speed for Aluminum with carbide ≈ 800 SFM (243.8 m/min), from the table below.
Spindle speed n = (Vc × 1000) ÷ (π × D), with Vc in m/min and D in mm.
Feed rate Vf = chip load × flutes × spindle speed (fz · Z · n). Feed per rev = fz · Z.
Material removal rate Q = axial depth × radial width × feed rate (ap · ae · Vf).
These are starting points — tune by sound, finish and tool life. Reduce feed and speed for full-slot cuts, deep pockets or light machines; chip-thin (raise feed) for light radial engagement.