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King 1440 Lathe Speed plate

If the motor is not original, is it the same speed? (so the speed table is correct…)
And/or, is it 3 phase (for use with VFD)?
 
No reason not to go with a 3-phase and a VFD. The second photo in post #14 is the speed chart for my mill. 12-speed belt system with a very conservative VFD configuration. Allows me to use the VFD to adjust speed, say when step drilling steel using a range of drills, without having to change belt positions. But still have the option to run a big cutter with the belts set for a low speed range while getting maximum HP from the motor at full speed.

VFD is set up to restrict output between 30 Hz and 90 Hz. Gives a 3:1 range with the nominal 1725 rpm motor adjustable between roughly 850 and 2500 motor shaft rpm. Gives a nice set of speed ranges while still providing the pure hardware grunt torque achieved by mechanical speed reduction. Best of both worlds.

As for the graphics, I ain’t Van Gogh. Simple line graphics are doable, if I can draw it in 2-d CAD I can engrave it.
 
whydontu said:
No reason not to go with a 3-phase and a VFD. The second photo in post #14 is the speed chart for my mill. 12-speed belt system with a very conservative VFD configuration. Allows me to use the VFD to adjust speed, say when step drilling steel using a range of drills, without having to change belt positions. But still have the option to run a big cutter with the belts set for a low speed range while getting maximum HP from the motor at full speed.

VFD is set up to restrict output between 30 Hz and 90 Hz. Gives a 3:1 range with the nominal 1725 rpm motor adjustable between roughly 850 and 2500 motor shaft rpm. Gives a nice set of speed ranges while still providing the pure hardware grunt torque achieved by mechanical speed reduction. Best of both worlds.

As for the graphics, I ain’t Van Gogh. Simple line graphics are doable, if I can draw it in 2-d CAD I can engrave it.
Click to expand...
Makes sense. With VFD and original graphics I at last have an idea what the speed is, even if I do adjust it a bit with the VFD.
 
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