different types of clamshell cutting tools
MM180 Clamshell. The MM180 clamshell lathe was designed for very large diameter, heavy cutting and bevelling applications. The world's largest gear driven split frame clamshell is highly accurate, flexible and portable for on-site machining applications and can accommodate flange and pipe sizes ranging from 144in (3657.6 mm) to 177in (4495.8 mm) OD.