DIG-DOG CNC Automatic Bore Welding Machine Portable Hydraulic Cylinder Line Boring Machine The DIG-DOG Portable Boring Machine is a revolutionary piece of portable processing equipment, meticulously engineered for on-site maintenance of construction machinery. Primarily utilized for the intricate processing of small pipe inner holes and concentric spacing holes, it stands out as an indispensable tool in the maintenance of heavy machinery such as excavators, cranes, and loaders. By significantly reducing equipment maintenance costs and enhancing operational efficiency, it has cemented its place as a vital resource in the field of construction machinery maintenance.


TYPE | BM-40 | BM-50 | BWM-50S | BWM-50P | BM-60 | BM-60S |
Main motor | 1.5KW Brushless DC | 1.5KW Brushless DC | 3KW Vertical servo | 3KW Vertical servo | 2KW DC servo | 2KW DC servo |
Power of cutter moving motor | 120W | 120W | 120W | 120W | 120W | 120W |
Main motor output speed | 125r/min | 125r/min | 0-300r/min | 0-300r/min | 100r/min | 80r/min |
Motor speed control | CVT | CVT | CVT | CVT | CVT | CVT |
Feed way | Tiptronic | Tiptronic | Tiptronic | Tiptronic | Tiptronic | Tiptronic |
The boring bar diameter | 40mm | 50mm | 50mm | 50mm | 60mm | 60mm |
Scope of boring | 45-200mm | 55mm-260mm | 55mm-260mm | 55mm-260mm | 65--500mm | 65-500mm |
Feed stroke | 380mm | 380mm | 200mm | 200mm | 420mm | 740mm |
Maximum cutting capacity on one side | 2-3mm | 2-3mm | 3mm | 2mm | 2-3mm | 2-3mm |
Machining roundness | 0.03mm | 0.03mm | 0.02mm | 0.03mm | 0.03mm | 0.05mm |
roughness | 3.2um | 3.2 | 3.2 | 3.2 | 3.2um | 3.2um |
Installation | Weld | Weld | Weld | Weld | Weld | Weld |
Hole range | * | * | 55-230mm | 55-230mm | * | * |
Single side welding thickness | * | * | 3-4mm | 2-3mm | * | * |
Wire type | * | * | 1.0 | 1.0 | * | * |








What size of line boring machine should I choose?
With a variety of line boring machines available in different sizes, selecting the right one depends on the specific job requirements. No single machine can cover all diameters accurately, so consider the typical projects you'll be undertaking to make an informed decision.