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What grade of aluminium is best for making a pulley?
| SillyOldDuffer | 10/08/2023 19:04:20 |
| 10668 forum posts 2415 photos | Posted by Michael Gilligan on 10/08/2023 09:59:45:
Posted by Tim Stevens on 03/04/2023 20:31:34:
Dave warns against 'fabricated' pulleys, but what exactly does he mean by it? … . I suspect that Dave just meant ‘fabricated’ to mean ‘made by machining’ … but only he can confirm or refute that. It is, however quite possible to fabricate Vee pulleys by using two truncated cones … either fixed together or keyed, with an adjustment mechanism. MichaelG. It is what I meant. The grain structure of extruded or rolled metal stock runs longitudinally, and making stock stronger lengthwise than across the diameter. Not ideal slicing stock to make pulleys, because pulley forces run the other way - centre out Stock is strong enough for a slow turning, small diameter pulley, but unwise for a large diameter pulley spinning at high RPM. It's better to make pulleys with a process that makes the item strong in the right direction, such as by casting or drop forging. In the past the flywheels on big steam engines often burst because they weren't strong enough. Dave |
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All Forum Topics > Materials > What grade of aluminium is best for making a pulley?