This close-up of the ball contact in a profile projector shows a gothic arch. It consists of at least two radii slightly larger than the ball used, but offset so the raceway touches the ball on both ...

Did you know that choosing the wrong drywall screws can cause screws to break, rust, slip, and even affect the quality of your project? Whether you are a builder, a wholesaler or a user of drywall ...

This file type includes high-resolution graphics and schematics when applicable. Lead screws are one of the most common linear-motion devices, thanks to their low cost and reliability. And recent ...