has any one made one or got a link of how to make one
thanks

Try these

http://www.westhouse.plus.com/chaindrive1.htm

http://www.westgarage.co.uk/services/chain/chaindrives.html

http://www.c42.mride.se/chaindrive.html

http://purplesagetradingpost.com/sumner/bvillecar/construction%20page-4.html

HTH

Neil