The recently updated ET 2.5 tonearm from Eminent Technology Inc., Tallahassee, Fla. (eminent-tech.com), uses high-tech carbon fiber, aluminum, and Teflon in its constrained-layer, highly stiff construction.
Counterweights, on the other hand, are lead.
The entire tonearm rides on a low-friction air bearing. A high-pressure (20-psi), low-flow pump sends air to a cylindrical manifold in the arm's bearing tube. Air, escaping through holes in the manifold, creates a cushion that totally supports the bearing tube. With air constantly escaping, pressure in the bearing is only about 7.5 psi. But bearing rigidity increases with the square of the air pressure, so the bearing is said to be quite rigid. The tonearm tracks linearly cross the record, keeping the cartridge or needle tangent to the record groove.
Unlike passive products - made of simple carbon springs - the bionic prostheses developed by Revival Bionics are propulsive, equipped with a motor and an artificial Achilles tendon...
Electric drives are a key technology for the performance of machines, robots, and power tools. Download this guide for an introduction to high-quality mechatronic drive systems...
Voice your opinion!
To join the conversation, and become an exclusive member of Machine Design, create an account today!
