The Ultimate CNC Calculation and Parts Master Guide — Feeds, Speeds, RPM, Torque, Tools, Inserts, Materials and Complete CNC Reference System

This page is a complete CNC calculation and parts reference system.

It combines formulas, tables, tool lists, material data, and machining logic into one place.

Designed for real machining use, not theory.

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SECTION 1 — CORE CNC FORMULAS
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Spindle Speed (RPM)

RPM = (Cutting Speed × 1000) / (π × Tool Diameter)

Feedrate

Feed = RPM × Flutes × Chip Load

Cutting Time

Time = Length / Feedrate

Material Removal Rate (MRR)

MRR = Width × Depth × Feedrate

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SECTION 2 — FEEDS & SPEEDS MASTER TABLE
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ALUMINUM

RPM → 8000 – 18000
Feed → high
Chip load → 0.03 – 0.08

STEEL

RPM → 2000 – 6000
Feed → medium
Chip load → 0.02 – 0.05

STAINLESS

RPM → 1500 – 4000
Feed → low
Chip load → 0.01 – 0.03

TITANIUM

RPM → 800 – 2500
Feed → controlled
Chip load → 0.01 – 0.02

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SECTION 3 — CNC TOOL LIST (MOST USED)
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End mills
Drills
Face mills
Ball nose cutters
Chamfer tools
Thread mills

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SECTION 4 — INSERT TYPES AND USAGE
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Turning inserts
Milling inserts
Thread inserts

Material match

Aluminum → sharp polished
Steel → coated carbide
Stainless → strong coated

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SECTION 5 — CNC MACHINE PARTS LIST
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Spindle
Axis motors
Tool holder
Coolant system
Controller
Workholding

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SECTION 6 — TOOL SELECTION TABLE
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Aluminum → 2 flute
Steel → 4 flute
Finishing → ball nose
Roughing → flat end mill

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SECTION 7 — COOLANT REFERENCE TABLE
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Flood → general machining
Mist → light cutting
Air → chip removal
Dry → special materials

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SECTION 8 — CNC PROBLEM FIX TABLE
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Tool break → reduce feed
Chatter → reduce RPM
Bad finish → reduce feed
Wrong size → adjust offset

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SECTION 9 — ADVANCED CALCULATIONS
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Surface Speed

Vc = (π × D × RPM) / 1000

Torque (simplified)

Torque ∝ cutting force × radius

Power

Power = Torque × RPM

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SECTION 10 — QUICK CNC DECISION SYSTEM
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If material soft → increase speed
If material hard → reduce speed
If tool breaks → reduce load
If chatter → improve rigidity

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FINAL PRINCIPLE

CNC machining is a system of calculations, tools, and materials.

Understanding how they interact allows faster machining, better quality, and fewer problems.

This page provides everything needed to make correct machining decisions instantly.