SDPE ENGINEERING TOOLS

CNC Machining • CAD • Manufacturing Tools

CNC RPM & Feed Calculator

Calculate spindle speed and feed rate for CNC machining.

RPM Calculator

Material

Cutting Tool

Tool Diameter (mm)

Vc — Cutting Speed (m/min)

π Value

Constant

Spindle Speed

RPM

Formula

N = (Vc × 1000) ÷ (π × D)

Where:
N = RPM
Vc = Cutting Speed (m/min)
D = Tool Diameter (mm)

Feed Calculator

RPM

Number of Teeth / Flutes

Feed per Tooth (mm/tooth)

Feed Rate

mm/min

Formula

Feed = RPM × Teeth × Feed per Tooth

Cutting Speed Reference

Material	Typical Vc	Recommended Tool
EN8 / C45	80–180 m/min	Carbide
EN31	50–120 m/min	Carbide
20MnCr5	80–160 m/min	Carbide
SS304	60–120 m/min	Carbide
Aluminium	200–500 m/min	Carbide
Cast Iron	80–180 m/min	Carbide

CAD Hole Coordinate Calculator

Upload your DXF drawing and generate X and Y hole coordinates using the left-bottom corner as X0 Y0.

📁 Upload DXF Drawing

Click here to select your DXF file

Coordinate Settings

Reference Point

Decimal Places

Export

Coordinates are measured from X0 Y0.

Holes are sorted from the nearest to X0 Y0.

Same diameter holes are grouped together.

Hole numbering starts from 1 for each diameter.

Please upload a DXF drawing.

0 Total Holes

0 Hole Sizes

0 X Size

0 Y Size