Unusual dual speed pulley on motor

This topic has 0 replies, 1 voice, and was last updated 31 October 2026 at 23:50 by gerry madden.

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31 October 2026 at 23:50 #872235
gerry madden
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@gerrymadden53711
I’m currently dismantling the motor from my Aciera F3 mill. The Brown Boveri motor is fitted with a large 5-sheaved pulley unit which is in two sections. The outer 2 sheaves are mounted on the outer end of the shaft and are keyed to rotate with the motor. However, the inner 3 sheaves contain some sort of epicyclic device and rotate at half motor speed.

It was relatively easy to remove the outer pulley but I cannot see how to get the remaining assembly off the motor shaft. There were two very long grub screws sitting in the base of one of the sheaves. I removed these but this hasn’t helped. There doesn’t seem to be anything else to attack. So it’s probably a pulling job for which I might need to make or buy a tool to ensure I don’t damage the aluminium sheaves. But before I do this, I just wondered if anyone has seen such a device before, and/or knows the correct way to remove it from the motor?

This is the rotor and front end-cover with the two pulleys fitted.

This is with the outer pulley removed…

Gerry
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Unusual dual speed pulley on motor

Unusual dual speed pulley on motor

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