For the first time in my life, because of this thread, I cut drywall and I did it with a Native 5 REX-45, for the purpose of understanding drywall better.
I'm working with scraps leftover from a buddy's project. The first thing he asked me was "why would you use a knife for cutting drywall?" I explained this thread. He brought up using a utility knife, because its thin, and allows you to cut deeper, which gives a cleaner break. He said for long pieces, it's best to get about half way through to ensure a good break. Small pieces sometimes just need a pass or two.
I varied the pressure on different passes and despite my efforts to keep the knife at 90 degrees, I did notice there was some side to side.
I just played around a little and then cleaned the tip for the photo.
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For speed and efficiency, I can see why some guys use extremely high pressure and really muscle it. As previously stated, I've seen guys put their weight behind it.
Those scenarios Im sure can break Maxamet or S110V. They just absolutely are not the right steel for drywall, unless there's no other choice, and then I'd use only light to medium pressure.