1) The cap iron, or chip breaker, in the film is only 0.3-0.1mm from the cutting edge, which is much less than the usual recommendation of 1/32″ (~0.8mm).
2) The test device is essentially a chisel plane. There is no mouth like with a conventional plane. I am wondering how much a tightly closed mouth would affect results.
3) I was impressed to see how effective a shallower cut is at reducing tear-out. The physics makes sense, but the benefit seems exponential.
4) The 80 degree breaker in the film only appeared to be a mere 0.4mm tall. A typical Bailey style chip breaker could easily be modified by grinding/honing a slight vertical on the leading edge. Just saying…