I am following this post with interest as i am also in the middle of an upgrade to an atc spindle which i have mounted and have running from the potentiometer , i plan on using the manual tool change butoon until i get my head around the auto tool change setup ,i also have a braking mechanism which was part of the original setup with the old spindle .i love having a go at these things myself but i am finding it difficult to get information online ,so hopefully i can get some good advice on the forum , i am running uccnc with the uc300eth-5lpt and ucbb.