manholt Report post Posted January 31, 2021 Deep hole drilling or tunnel boring. What most drill arm machines are used for! Share this post Link to post Share on other sites
hermanmullins Report post Posted January 31, 2021 It's been almost 2 years since the OP asked his question and he hasn't been back once and we have gotten way off Topic. We will call it closed and someone can start another Topic if the need arises. Herman Share this post Link to post Share on other sites
