Eric The Viking":w1xje3qt said:Given the use of hollows & rounds to touch-in places where it was tricky for the moulding plane (grain dive, etc.), I wondered: when moulding planes were supplied, did the makers specify the curves being cut in H+R numbers, or were they standardised shapes/sizes and a thing a joiner or cabinetmaker was expected to know?
Someone who has more planes than I do and who has been through more can confirm this, but I don't think there was universal standardization of anything. I bought a box of 45 moulding planes at one point, and no single plane with a number on the end matched any others. That is, if I had 3 #12 rounds in the box, all of them were drastically different.
I think a cabinetmaker would get a matched set (or perhaps put together a mixed set and mate the planes to each other) and become familiar with them and then just know what to use/lay out based on personal experience with the set. I have chosen to make mine when I need a pair (to date, I've only had to make four pairs) due to the difficulty of finding a good set over here for a reasonable price, and the fact that any set that's not in use will still require some tuning.
Trying to find some standardization, even in the amount of arc included in the rounds - it can vary some. Even that can drive you nutty.
I recall discussing with Larry Williams that the most useful thing from his H&R video was the list of measurements, arcs, etc, and that's something that he developed. He said his wife (I hope I'm remembering these details) thought he was nuts for giving that information away, so it's not something he just pulled from a historic text.