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Resource Guides

CNC Resource Guides

Use these guides when you need the reasoning behind a calculator result: formulas, assumptions, source boundaries, workflow sequencing, and shop-floor release checks.

Reviewed: 2026-07-28Source: Reviewed against ISO 230, GB/T 17421, OEM documentation, and shop-floor calculator assumptions.

Start with the guide that matches the decision, then hand off to the calculator or reference table called out in that guide.

Open feeds and speedsOpen machining time

Formula and cutting guides

SFM to RPM formula guide

Formula audit scope for surface speed, spindle RPM, imperial constants, and metric Vc conversion.

Cutting speed and feed formulas

SFM, RPM, chip load, feed rate, and MRR formula chain before calculator handoff.

Feeds and speeds guide

Material speed, chip load, radial engagement, and process-specific calculator routing.

Chip load guide

Feed-per-tooth method, rubbing risk, chip thinning, and tool-life boundary checks.

Cutting speed guide

How to choose and calibrate starting cutting speeds before RPM conversion.

MRR optimization guide

Connect depth, width, feed, spindle power, chip evacuation, and roughing limits.

Cycle-time and quoting guides

How to calculate machining time

Cut time, rapid motion, tool changes, handling, setup allocation, and quoting handoff.

Machining time estimation

Manual estimating boundaries and confidence factors before moving into job costing.

Cycle time formulas

Milling, turning, drilling, setup, and batch cycle-time formulas in one reference.

Machining time reduction

Prioritize non-cut time, cutting strategy, setup, and bottleneck checks.

ROI, TCO, maintenance, and acceptance guides

CNC ROI guide

Payback, OEE, utilization, capacity gain, and investment approval assumptions.

CNC TCO guide

Lifecycle ownership cost, maintenance, tooling, energy, and hidden cost categories.

Preventive maintenance cost

PM labor, service intervals, downtime exposure, and risk reserve planning.

Machine acceptance checklist

Acceptance evidence path for factory tests, site tests, geometry, and documentation.