Tube notching is commonly performed before joining tubes to make a tee or similar joint before welding process. Either one or both tubes may be notched before assembly. A familiar example of tube notching is in the manufacture of bicycle frames, motorcycle frames and furniture holder.
End notching works the end of the tube, such as a semicircular concavity to make the base of a tee, or a convex vee to fit into a mitre. Please refer to the photos of the attached file
Notching machine works compare with the Press Machine