Best way to slot holes?

slot cutting drill bit for metal   Dan slot hot spin

One thing that would work is a metal cut off saw and a pillar drill vice as needs to hold lower than a normal vice and rigid draw cuts on bar

One thing that would work is a metal cut off saw and a pillar drill vice as needs to hold lower than a normal vice and rigid draw cuts on bar For a small hole use a twist drill bit with a drill motor A large hole could be cut with a torch, plasma cutter or a CNC machine A lot depends

bally titanic slot machine HSS Slot Drill Cutting Tools, Diameter: 10 mm We are leading manufacturer supplier of Brazed Crabide, HSS ,Solid Carbide Indexable cutting depend Erbauer Straight Shank Metal Drill Bits 5mm x 86mm 5 Pack · High-Speed Steel 5mm Straight Shank · Suitable for Metal · 52mm Working Length