Tube Notching Machine
In order for two tubes of metal to be welded together successfully, one needs to have a precise hole cut in it. This machine does that. Bicycles, geodesic dome structures, roll-cages, and aircraft frames all require tubes to securely fastened at irregular angles.
https://www.grizzly.com/products/grizzly-4-x-79-abrasive-tube-notcher/g…