Thumbing through the 1920's catalog, I did find that the 32" plainer required 352 RPM into a 12" pulley to produce 45 Ft. Cutting Speed (they also advise 15 HP). In addition to the extra iron, this machine looks to have a different table drive than the 30" machine of the same time, using an additional bull gear group under the table. I expect that my plainer will see a variety of work from smaller flat plates, up to an 8' long lathe bed. Since this plainer has a shorter base casting than the 1920's machines, I'd rather err on the side of the machine running a little slow than risk having the table come off the end of the base, so 352 RPM would be a good place to start, but I'll know more when I can count pinion teeth and shaft rotations.My planer, which is about 30 years older than yours runs at a cutting speed of 25 feet per minute. I would guess that yours might be in the 25 - 50 ft/m speed ranges for high and low so you could calculate backwards from there for pulley speeds.