Recent Blogs
Four-pulley Two-speed Drive: Ideal Ratio Comparison
Compare two ideal no-slip speed ratios and their paired pitch-diameter sums. Equal diameter sums alone do not establish that the same belt fits both positions.
Drill (general) Mechanism Explained: How It Works, Parts, RPM Formula and Uses
Convert a cutting-speed target and drill diameter into spindle RPM. Inspect a rotating twist drill and compare the target with an entered machine limit.
Three-pulley Two-speed Drive: Ideal Speed and Torque Ratios
Compare two stepped-pulley speed ratios and reciprocal lossless torque ratios. The schematic idler redirects the belt; belt fit, tension and shifting are not calculated.
Shifting Device for Cone Pulleys: How It Works, Parts, Diagram, and Speed Ratio Calculator
How a shifting device for cone pulleys works on lathes, drill presses, and line-shaft machinery — belt fork geometry, ratio steps, and worked sizing example.
Drilling Machine: Spindle Rotation, Quill Feed and Cutting-Speed Calculator
Explore a drill press with spindle rotation and adjustable quill position. Calculate target RPM, actual cutting speed and tool-tip position below the work.