Shop calculators

Set the spindle speed and feed for an end mill, find out what went wrong with a weld and whether the code accepts it, and pick the flap discs to finish it. Each one shows its working and names its sources, and nothing you type leaves your browser.

Starting points from published charts, makers' guides and code summaries. Your machine, your welding procedure, the code edition in your contract and the labels on your tooling and discs come first.