Rod
I like that chart. I used to have the .pdf file you posted many years ago, but that was a few hard drive failures ago also.
I know we've kind of moved into more capable machines in this discussion, but related to that chart, is a "hack" I use for the Delta two speed shaper I own.
I can get the nominal 7Krpm,and 10Krpm as per the manual, but I also slide the motor up and down on the mounting plate to get an ~ 8Krpm and~ 9Krpm, by swapping the normal pulley configuration. Two speeds becomes four speeds. I Don't know if it would work for other two speed shapers of different colors.??? But it opens up more options. The 100mm cutters I've bought want to run 9krpm to 10Krpm, max. 7Krpm would put them just at the lower limit of the chart, or possibly off as is the case of my lock miter cutter.
"The first thing you need to know, will likely be the last thing you learn." (Unknown)