Aluminium 5/16-18 Joint Pin Questions
- Thread starter Barry13
- Start date
I would think that with that fine a thread and smaller diameter it would be too easy to distort the threads on aluminum. Joint protectors were introduced when many cue makers were using 5/16=18 threads made of brass, because pins got bent or threads deformed when a cue was dropped.....probably worse with aluminum.
+1.
As a machinist I strongly advise against the idea of having a 5/16 aluminium pin. It will not last for long, the threads will wear fast and the pin will bend if any sideway force is applied. Titanium pin would work and is a bit lighter but the weight difference is minimal in such a small pin.
Can you take the weight off from the end of the cue?
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This really depends on how you yourself. Handles your cue. Robinson cues use an Aluminum screw and washer mounted in the shaft. John Robinson was a very accomplished Cue maker with a very distinctive hit. I'm sure his son Greg still builds using his father's methods.
Another problem with aluminum pins is "galling".
From Wikipedia:
"Galling is a form of wear caused by adhesion between sliding surfaces. When a material galls, some of it is pulled with the contacting surface, especially if there is a large amount of force compressing the surfaces together. Galling is caused by a combination of friction and adhesion between the surfaces, followed by slipping and tearing of crystal structure beneath the surface. This will generally leave some material stuck or even friction welded to the adjacent surface, whereas the galled material may appear gouged with balled-up or torn lumps of material stuck to its surface.
Galling is most commonly found in metal surfaces that are in sliding contact with each other. It is especially common where there is inadequate lubrication between the surfaces. However, certain metals will generally be more prone to galling, due to the atomic structure of their crystals. For example, aluminium is a metal that will gall very easily, whereas annealed (softened) steel is slightly more resistant to galling. Steel that is fully hardened is very resistant to galling.
Galling is a common problem in most applications where metals slide while in contact with other metals. This can happen regardless of whether the metals are the same or of different kinds. Metals such as brass are often chosen for bearings, bushings, and other sliding applications because of their resistance to galling, as well as other forms of mechanical abrasion."
FYI
Gary
From Wikipedia:
"Galling is a form of wear caused by adhesion between sliding surfaces. When a material galls, some of it is pulled with the contacting surface, especially if there is a large amount of force compressing the surfaces together. Galling is caused by a combination of friction and adhesion between the surfaces, followed by slipping and tearing of crystal structure beneath the surface. This will generally leave some material stuck or even friction welded to the adjacent surface, whereas the galled material may appear gouged with balled-up or torn lumps of material stuck to its surface.
Galling is most commonly found in metal surfaces that are in sliding contact with each other. It is especially common where there is inadequate lubrication between the surfaces. However, certain metals will generally be more prone to galling, due to the atomic structure of their crystals. For example, aluminium is a metal that will gall very easily, whereas annealed (softened) steel is slightly more resistant to galling. Steel that is fully hardened is very resistant to galling.
Galling is a common problem in most applications where metals slide while in contact with other metals. This can happen regardless of whether the metals are the same or of different kinds. Metals such as brass are often chosen for bearings, bushings, and other sliding applications because of their resistance to galling, as well as other forms of mechanical abrasion."
FYI
Gary
