4 ms·
FWIW the Bridgeport milling machines could hit 1/10,000th of an inch which is 25 microns of accuracy many years ago. DRO and precisely controlled steppers on ne
by shrubble 3y ago
FWIW the Bridgeport milling machines could hit 1/10,000th of an inch which is 25 microns of accuracy many years ago. DRO and precisely controlled steppers on newer machines can do much better.
The Pratt and Whitney Jig Borer was hitting 50 microns... in 1928. See https://img.photobucket.com/albums/v337/johnoder/8PiecesofIron.jpg https://img.photobucket.com/albums/v337/johnoder/8PiecesofIr...
- mitthrowaway2 3y agoThe main difference is the mill will be that accurate along each axis of motion independently, while the jig borer will hold that accuracy on all 6 degrees of freedom throughout the full workspace volume.
- dtgriscom 3y agoI'm forever re-realizing that there was awesome technology 100+ years ago. Not everything cool was invented yesterday.