Taper Shaft or Bushing
A common method of introducing an interference is to manufacture a tapered shaft and tapered bore. At installation, axial force is applied (by tightening a nut against a thread on the taper shaft's end) to advance the hub along the tapered shaft
Furthermore, you'll need a method for removing the part later.
sounds like a a square taper crank to me and it is an interference fit as it achieves the interference fit by the crank arm being driven up the tapered shaft and there is some degree of deformation of the aluminium: xmas-big-grin:
and i'm not an engineer im just always right
and i dont care what the non grease gestapo have to say
The word ‘interference’ in your sentence, presumably quoted from another source, does not refer to the type of fit but simply says an interference is created between the two surfaces – which is actually obvious. This is an important distinction. Any two surfaces when secured together, especially with load (a force of some kind like bolt, clamp, pressure etc), will create interference between those surfaces but this in itself does not make it an interference fit. The term “interference fit” means that the security of the fixture is achieved by the interference between the two components. If this were true for bicycle cranks then everybody could permanently remove their crank bolts in full confidence that their cranks would not fall off while riding. Of course we know this to be not the case and the reason why not is because a bicycle crank taper assembly is not an interference fit, it is a clearance fit secured fast by a bolt (or sometimes a nut). Weight weenies worldwide would rejoice if crank tapers were interference fits because they could all save a few grams and almost certainly would’ve been doing so already since decades. This is a nice discussion but please let's not fly in the face of facts. This is engineering fact not just an opinion and if anyone insists on continually disagreeing with fact then OK go ahead..