BB2250 is a 2 ¼” Portable Boring Bar that adds versatility to our extensive Boring Bar line. KWIKWAY is a standard cylinder boring bar that offers two speeds and two feeds, which provides four combinations for boring versatility. Multiple Bore Bars (MBMC) provide machining capabilities on set up equipment where disassembly or removal from .... on. Apr 1, 2005. Cylinder boring and honing is the heart of most engine builders' operations. The equipment you use will have a lasting effect on the quality of the product your shop sends out the door on a day-by-day basis. While equipment varies from manufacturer to manufacturer, so too do your needs for a specific type of machine. l Boring bar diameter: 60mm ( 30mm option) l Boring Diamete Used in processing inner hole, Big scaled ship fixed hole, ship axis hole, etc.it r:65-600mm. l (add 30mm bar can work boring diameter 35-600mm ) l Boring bar rpm: 0-120. l Feed rate:0-.5mm/rev. l Facing head feed rate:0.148/.298mm/rev.