Feeds, speeds, and every limit in between.

A feeds and speeds calculator that does what the paid apps do, for free and with...

Drilling is not milling. A twist drill runs slower than an end mill in the same...

On a lathe the part spins, not the tool, so the spindle RPM is set by the...

Chip load is one of the key numbers behind whether an end mill cuts cleanly or...

Surface speed and spindle RPM are two ways of describing the same thing: how fast...

Find out whether your machine can drive a cut before you crash into the limit....

Material removal rate (also called metal removal rate, or MRR) is the volume of...

Predict the finish before you cut it. For turning, enter the feed per revolution...

Convert a steel hardness between the three scales machinists actually meet:...

A turning insert code like CNMG120408 or its ANSI form CNMG432 packs seven facts...

Drill the right hole before you tap. This calculator gives the tap drill diameter...

Roll-form taps do not cut a chip; they push the metal up into the thread, so they...

In tapping the feed rate is not a free choice the way it is in drilling or...

Inch threads are called out by threads per inch and metric threads by a pitch in...

Get the basic dimensions of a 60-degree thread from its major diameter and pitch....

A thread mill orbits the hole, so the feed the cutting edge sees is not the feed...

A thread mill's cutting profile sits in the plane perpendicular to the tool axis,...

Cut a thread on the lathe one pass at a time without guessing the infeeds. Enter...

ACME threads are the 29-degree trapezoidal threads used on lead screws, vises,...

The three-wire method is how you check the pitch diameter of a thread with an...

The right-triangle solve is the most common piece of math at a machine: find a...

Check a positional feature against its GD&T callout. Enter how far the feature...

The ISO system of limits and fits (ISO 286) turns a nominal size and a pair of...

Span measurement, or base tangent length, is how you check tooth thickness on a...

Measuring over pins is how you check tooth thickness on a gear or involute spline...

Set a precise angle for inspection or grinding with a sine bar and a stack of...

Inspect or cut a dovetail to size by measuring over two pins. Enter the...

Lay out a bolt hole circle without trigonometry by hand. Enter the bolt circle...

Cut a countersink to the right diameter the first time. Enter the finished top...

Work out what a piece of stock weighs before you order it, lift it, or quote it....

Quote a job or sanity-check a price in seconds. Enter your machine's hourly rate,...

Before you order bar stock or quote a run, you need to know how many parts each...

Set the motion resolution on a CNC router, mill conversion or 3D printer. Enter...

A knurl only forms a clean, closed pattern when the circumference holds a whole...

Work out a gear ratio from the tooth counts and see exactly what it does to speed...

Switch between decimal inches, millimetres and fractional inches without reaching...

SFM and chip load by material, sourced

Fraction, number, letter to decimal and mm

Backplot a program and estimate cycle time, in your browser

The 14 geometric characteristics, modifiers and feature control frames