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Picture of Step by Step Tube Notching on Horizontal Milling Machine
A quick demonstration of the basic notching operation on a Horizontal Milling Machine.

Step 1: Cutting Notch with Ordinary Hole Saw -

Picture of 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)