Rockwell RT 40 Table Saw motor options

Delta used a proprietary motor mount on the unisaws. I don’t know if the RT 40 has the same sort of issue but it’s possible. Have a look at it.

Those saws were made in Brazil by Invicta. Perhaps Delta just badged them as they were in which case you may be lucky and find the motor mount uncomplicated.

Single Phase possible? yes
Check your current motor frame size and mount. Those saws use standard base plate flange mount, and are easy to change (excluding the weight). The RT40 motor hangs upside down on base plate .vs. older Rockwell that hung sideways. Expect you will find a 213/215 frame motor with 1-1/8” shaft, weighing over 75lbs; so be safe changing it out.

The RT40 were commonly sold with 5HP & 7.5HP motors. Newer Delta models offer a 10HP option, likely for folks spinning the 2” wide 12” OD dado blades with extended arbor. The arbor on the 12/14” saws is removable, and there are different sizes. Check your arbor closely before buying blades. Some models would support a 5/8” saw arbor, and run 8-10” blades on that machine. Which also means a 3HP motor could be used, if not sawing the 4” thick timber intended to run on that monster 14” saw blade. :-)

If you have a 5HP 3PH motor, you will find it cheaper to buy a VFD; than buy a new 5HP motor. There are many threads on using VFD with 5HP motors if you want more information.

Best Luck.

-- If it wasn't for bad luck, I wouldn't have no luck at all, - Albert King - Born Under a Bad Sign released 1967