15-02-2022, 03:48 PM
(This post was last modified: 15-02-2022, 08:29 PM by Bob Culver.)
I have read explanations of how the crowning works but whilst I am happy to explain roll centres, effect on handling etc, secondary unbalance and so on, I am not confident to attempt!
My father's lathe had a soft flat canvas belt and fast and loose pulleys and the way the belt sorted itself on each pulley intrigued me from a very small boy.
(for those less than 70 years old, machinery was commonly driven from constant rotating shafting. Larger machines had clutches but for smaller the driven pulley had a loose or free pulley alongside . The belt was pushed by a slider (or hand!) sideways and quickly centred itself on the other pulley
(editted to correct. Driven not driving pulleys are fixed and loose so the belt is always running. As not convenient to have the paired pulleys on the actual machine, usaully an intermediate countershaft involved.)
My father's lathe had a soft flat canvas belt and fast and loose pulleys and the way the belt sorted itself on each pulley intrigued me from a very small boy.
(for those less than 70 years old, machinery was commonly driven from constant rotating shafting. Larger machines had clutches but for smaller the driven pulley had a loose or free pulley alongside . The belt was pushed by a slider (or hand!) sideways and quickly centred itself on the other pulley
(editted to correct. Driven not driving pulleys are fixed and loose so the belt is always running. As not convenient to have the paired pulleys on the actual machine, usaully an intermediate countershaft involved.)