This is the place to get info on spring design. The info is specialised, but this is one of the BEST resource pages I have found on the 'net. The Machinists' Exchange On-line A US based newsletter for machinist trade talk and exchange of information. Lots to look at including calculators and links. This is a great site, with info from old magazines about making your own machines.
Project plans for machine tools.
Nice site and a great service to everyone. Great story well documented. This site is a goldmine of information on sheet-metal work. Articles by The Tinman, Kent White, writer for Sport Aviation, Experimenter, Custom Planes, and Automotive Body Repair. Kent freely shares his vast experience in how-to articles on restoration and fabrication metalworking techniques.