/me resists urge to curse and flame
You might want to check this thread started by
you on this topic a few days ago
http://www.cnczone.com/forums/showthread.php?t=7462
Also, keep in mind that direct-driving an indexing head with belt and pulley is going to result in a loss of precision at the work piece. Also, a worm gear system tends to have better self-locking characteristics that help prevent your cutters from getting a tooth on the work, and taking it for a "surprise spin"