The high school I went to in the late 1980s was originally the city community college; the campus was pretty large. The woodshop was located in what was termed the "industrial arts" building (the building essentially was a high school "techshop" all on its own; small engine repair, drafting, autoshop, woodshop, metalshop, etc - all under one roof, three stories tall).
Well, the woodshop itself had equipment that was decades old; some of the equipment was quality stuff dating from the 1930s. We had this huge surface planer machine that could take wood 6 inches thick and 8 feet wide; it took a good 10 minutes for it to come to a complete stop after powering it up.
A friend of mine wanted to see if it would plane 1/2" in one pass off a 2x6; the instructor of the class had no problem with trying it, either!
It did. You wouldn't believe the sound it made, but it didn't miss a beat doing it.