Engineering Tools
Calculators & References
35+ practical tools for CNC machining planning: speeds, feeds, geometry, drilling, tapping, threading, fits, surface finish, workholding, and quality. Every tool gives you transparent formulas and beginner-friendly explanations.
01 · Machining Parameters
Convert process inputs into planning values for speed, feed, and productivity.
Cutting Speed Calculator
Reverse-lookup: find Vc from diameter and RPM.
Spindle Speed Calculator
RPM from cutting speed and tool diameter.
Feed Rate Calculator
Vf from chip load, tooth count, and RPM.
Material Removal Rate
Metal removal rate Q = Vf × ap × ae.
Machining Time Estimator
First-pass cycle time estimate.
Power & Torque Estimator
Check if the cut fits the spindle.
02 · Tooling & Process Planning
Tool stability, chip load, drilling, tapping, and tool life considerations.
Chip Load Reference
Understand fz, tooth count, and feed rate.
Tool Overhang Risk Check
Deflection and chatter risk by diameter and length.
Tool Life Planning
Balance life, quality, and productivity.
Drilling Parameter Assistant
Drill RPM, feed, depth, pecking, safety.
Tapping Parameter Assistant
Rigid tapping RPM, feed, and tap drill size.
03 · Geometry & Coordinates
Turn drawing geometry into reviewable coordinates before programming.
Bolt Circle Calculator
X/Y positions for equally spaced holes.
Hole Pattern Generator
Rectangular and circular hole coordinate tables.
Right-Triangle Calculator
Missing sides and angles for angled faces and coordinates.
Arc & Chord Calculator
Radius, chord, sagitta, and included angle.
Taper & Angle Calculator
Taper dimensions, half-angle, and taper per 100 mm.
Coordinate Transformation
Rotate, translate, and mirror X/Y coordinates.
04 · Turning Engineering
Turning-specific RPM, feed, CSS, and threading calculations.
Turning Speed & Feed
RPM, mm/rev, and surface speed for turning.
Constant Surface Speed
CSS crossover diameter and max RPM limits.
Threading Calculator
Pitch, lead, depth, passes, and minor diameter.
Grooving Parameter Assistant
RPM, feed, depth limits, and chip-breaking guidance.
Boring-Bar Deflection Check
Deflection and chatter risk by diameter, overhang, and material.
05 · Workholding & Setup
Setup decisions: locating, clamping, soft jaws, and repeatability.
Soft-Jaw Step Calculator
Bore diameter, step diameter, and engagement depth.
Clamping Force Estimator
Estimate force from screw torque or hydraulic pressure.
Setup Clearance Check
Tool, holder, fixture, and travel clearance calculator.
Datum Planning Worksheet
3-2-1 locating surfaces and inspection datum checklist.
06 · Quality & Inspection
Tolerances, fits, surface roughness, and inspection planning.
Basic Fit Reference
Tolerance system concepts: clearance, transition, interference.
Surface Finish Conversion
Ra, Rz, RMS, and µin ↔ µm conversion.
Tolerance Stack-Up Assistant
Worst-case and RSS tolerance accumulation across dimension chains.
Measurement Planning
Instrument selection, datum strategy, and acceptance criteria.
07 · Engineering Utilities
Reusable references and worksheets supporting every domain.
Unit Conversion
Length, speed, feed, torque, pressure, temperature.
Formula Library
Search all formulas; each links to its calculator.
Printable Setup Worksheet
Job, tooling, zero, and first-article inspection sheet.
Material Property Reference
Cutting speeds, feeds, and chip types by workpiece material.
Tool Selection Guide
Cutter geometry, flutes, helix, and coating by operation.