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 the single number that decides 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 is the honest measure of how hard a milling cut is working...

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

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...

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...

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

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

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...

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...

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

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

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

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...

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

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

SFM and chip load by material, sourced

Fraction, number, letter to decimal and mm