Emco pc mill 55 upgrade

[magicniner]

The limiting factors for safe maximum speed for an induction motor are the bearings, rotor integrity and rotor balance.
A modern induction motor plate is generally marked with the speeds at 50hz & 60hz, these are neither minimums or maximums, the marked speeds on a motor plate are simply those at which the motor will run for the stated supply frequencies.
Only by referring to the manufacturer's technical specification for a given motor model and power can you determine the maximum safe working speed, inverter rated motors will have the maximum speed stated as a percentage of those marked on the motor plate in the manufacturer's documentation, but not on the motor plate unless expressly stated as a "Max".
I have made use of motor manufacturer data to set the maximum speed for my lathe and mills, all were rated in the manufacturer's documentation at considerably more than 100% of the plated speeds.

- Nick