Milling & geometry
Calculate spindle speed, chip load, angles and hole patterns.
TOOLS FOR THE SHOP FLOOR
Less calculating.
More cutting.
Free CNC calculators, clear formulas, and practical tooling guides. Find your numbers. Understand your next cut.
in / mm · Formulas included · Free to use
PRECISION STARTS WITH THE NUMBERS
START WITH YOUR OPERATION
Shop tools that get to the point.
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Turning & taper
Work out RPM, feed and taper Z length in inches or millimetres.
Drilling & hole depth
Choose twist, spade or U-drill calculations, with material guidance.
TOOLING, EXPLAINED
Choose the insert
for the cut.
CNMG, DNMG or VNMG? Compare shape and profile access, then check the material, grade, chipbreaker and holder.
CNMG · 80°
DNMG · 55°
VNMG · 35°
Tooling illustration. Confirm the exact insert and holder specifications.
KEEP THE MATH HANDY
A quick calculation, right here.
Open the free workbench for milling, drilling, turning, tapping, threading and X-to-Z taper geometry.
Open the quick calculator
FREE MACHINIST TOOLS
Machining calculators
Milling, drilling, lathe, tapping and threading calculations in Imperial and Metric units.
FREE MACHINIST TOOL
Milling calculator
RECOMMENDED STARTING RANGEBroad starting guidance only—prefer the insert/tool manufacturer’s cutting data.
THREAD CALL-OUT0.500″–8 UNRECOMMENDED INSERT STYLE16ER 8UNExternal, right-hand full-profile style. Confirm holder, hand, pitch range and manufacturer data.
| THREAD VALUE | COMPUTED RESULT |
|---|---|
| Selected standard | |
| Pitch | |
| Lead | |
| Included angle / form | |
| Theoretical sharp-V height | |
| Basic external minor diameter | |
| Basic internal minor diameter | |
| Taper / specification note |
SPINDLE1,528RPM
TABLE / TOOL FEED12.22IPM
FEED / REV0.0080in/rev
Educational starting point only. Verify against the cutting-tool manufacturer’s data, machine limits and a safe prove-out. Thread diameters are basic 60° geometry and do not include class or tolerance.
FANUC LATHE TOOL
Two-line G76 program generator
Build a reviewable starting program. Confirm your exact control format and every value before running.
MATERIAL SPEED STARTING RANGE
CALCULATED START RPM
THREAD CALL-OUT
Mandatory verification: Fanuc G76 address meanings and integer scaling vary by control generation and machine builder. Confirm diameter/radius conventions, P/Q scaling, taper sign, tool orientation, clearance, spindle direction, insert data and the machine manual. Never run generated code without simulation, single-block and a safe prove-out.
FREE SHOP MATH
Angle & taper calculator
Find angles, missing sides and taper geometry. All angles are measured in degrees.
Formulas and angle conventions
Right triangle: θ = atan(rise / run); travel = √(run² + rise²). With angle and run: rise = run × tan(θ); travel = run / cos(θ). The other acute angle is 90° − θ.
Find Z: Z = (major X − minor X) / (2 × tan θ). θ is the angle to the spindle axis. For a full included angle A, use θ = A / 2. Example: X2 to X1 at 30° to the axis gives Z = 0.866025 in. At a 30° included angle, Z = 1.866025 in.
Taper: radial change = (D − d) / 2; half-angle θ = atan((D − d) / (2L)); included angle = 2θ; diameter taper per unit length = (D − d) / L. Enter the axial length, not the sloping surface length. Values use one common length unit.
The diagram illustrates the angle convention and is not to scale. Confirm whether your drawing or machine setup specifies the half-angle or included angle.
PRECISION IN MOTION
LEARN THE WHY BEHIND THE NUMBERS
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