I am thinking about using an optical sensor to tell my machine that the hole was drilled.  I am doing a continuous drill system with a small drill bit.  I would like to know that the hole was drill and the bit didnt break off in the hole.  This would step through the subroutine in my G Code.  Is this possible?

Thanks.  Eddy 

Eddy - please do not cross post - especially numerous times. you already have an active thread for this here http://www.machsupport.com/forum/index.php/topic,20499.msg142371.html#msg142371