Hi all ,I am in the process of installing replacement windows in a concrete wall with typical steel frame windows,I want to screw the new ones into the concrete with Tapcon screws but need to get through the steel first,I plan on drilling into the steel as far as possible and maybe somehow clean out the remaining bit of steel so I can use the masonry bit the rest of the way.
Thoughts?
Geo

 

My thought is that you will immediately dull the drill bit that you use on the steel the instant it hits the concrete. So plan to either buy a couple drill bits, or plan to sharpen them. Putting a drop of oil on the tip of the drill bit every few seconds as you drill, and drilling at a low speed will help. Resist the urge to drill at maximum RPM's. As soon as you make it through the steel... stop drilling!!! The hole in the steel should be slightly larger than your Tapcon screws.

 

Why not drill the steel frames before the windows are installed?

 

The frames were installed when the house was built,I am installing replacement windows into the existing frames.
Geo