Chapter 4 of the USCF rule book discusses equipment standards. (Sorry, the USCF rule book isn't available for free online; You'd have to buy a copy. Btw, I think I heard on the USCF forums that the new 6th edition is now out in some kind of digital format, but still not free. Hard copy of the 6th edition available later this year?)
For FIDE, somewhere in here: http://www.fide.com/component/handbook/?id=16&view=category
Hi. I want to make my own chess set for use in tournaments. Where can I find the guidelines / rules I must use when building it? Thanks for your time.