Devin,

The reason why I mentioned the other types of mills is because 99% of the larger mills would have big problems without a brake on the Z axis. Either that or the gibb needs to be tightly locked before shutting the machine off like Pete mentioned.

As Pete already stated if the operator forgot to lock the gibb the head may end up dropping and causing some serious damage.

Not everyone reading this post has your mill.

Sorry to be so confrontational, ask Lee he will tell you its my nature.

Jeff...