Drill 120mm hole on case?

[bdiaz9911]

Will my cordless drill be strong enough to make a 120mm hole on my metal case?

 

[Calvin7]

I'm not familiar with that model, but you need a high RPM drill.

Drill works up to 3000 RPM
https://www.harborfreight.com/38-in-variable-speed-reversible-drill-60614.html

 

[mjslakeridge]

Is that a metal cutting keyhole saw, or a wood cutting one? I would think you would need a fine-tooth bit to cut through metal (presumably your case is made of stamped steel).

 

[Calvin7]

The hole saw looks like it is for wood not metal.

 

[Calvin7]

When working as electrician, I have often used a hydraulic punch to make holes in metal.
Knockout Punch Kit
https://www.zoro.com/greenlee-round-knockout-punch-kit-12-to-1-14-in-735bb/i/G1280833/

A 120mm hole equals 4.72In. The cost of such a punch makes it something for factory or use on a larger scale.
Punch Unit - 4.72In. $905.95
https://www.zoro.com/greenlee-punch-unit-472in-730bb-1200/i/G0901857/

 

[mjslakeridge]

I think I would drill a pilot hole with a drill bit, and then use a fine tooth metal cutting blade in a jig saw to cut out the hole. Make a template out of paper or cardboard, and trace the outline of the hole onto the case with a sharpie. It won't be the smoothest hole, but you can use a file with a curved face to smooth it out.