if any one wants a look, heres the link to a woodchipper which i will base my design/build on http://www.hansachippers.com.au/C7.htm
or the bigger model
http://www.hansachippers.com.au/C13.htm
its the most simplest design i have come across, hoping it will turn out safe and working grin

thanx everyone for the links, and helpfull advice, mush appreciated wink