A quick demonstration of the basic notching operation on a Horizontal Milling Machine.
Step 1: Cutting Notch With Ordinary Hole Saw -
Center tubing to be notched on appropriate jig/holder.
Bringheli jig being used here setup in a simple mill vise.
Centered the tubing using and edge finder then moving table to the center ((edge finder / 2) + tube diameter/ 2)
Step 2: Video of Tube Notch on Horizontal Milling Machine.
Step 3: Finish Notch With File
Tidy up the initial cut from Milling Machine with a half round file.