How to couple/connect a shaft to a disk?

[zuryum]

Hi,

I'm new to part design/mechanical engineering and I have the following question. I know it must be a very trivial question for most of you guys :) .. but I'm new to this.

• Blue: steel shaft, 5/8" diameter, connected to a motor
• Green: aluminum disk, 10" diameter, 1/2" thick, 3" hole
• Goal: the shaft should rotate the disk

The Question: I'm wondering how can the shaft be connected to the disk?

I tried searching for bushings, various forms of couplings, etc, but couldn't find anything that can connect the two.

Does this mean I would have to machine my own coupling, and there are no standard fittings/parts that would do the job?

FYI, the project needs high torque, so I'm guessing (please correct me if I'm wrong) that a coupling needs to have a large diameter as to apply the torque at a greater distance from the center.

Thank you!

 

[Mech_Engineer]

I think what you're looking for is called a hub. I'm not sure you'll be able to find something the exact right size for the geometry you've provided (typically a wheel/disc like shown will include mounting holes of some kind), but this will point you in the right direction.

Example hub for a go-kart:

 

[zuryum]

I think what you're looking for is called a hub. I'm not sure you'll be able to find something the exact right size for the geometry you've provided (typically a wheel/disc like shown will include mounting holes of some kind), but this will point you in the right direction.

Example hub for a go-kart:
View attachment 228720

Thank you for the tip! Yes I already tried looking for hubs like that, but couldn't find anything with the right size or anywhere near 3".

 

[Asymptotic]

Why must the hole be 3 inches? Why not make it smaller, and use an off-the-shelf hub?

 

[JBA]

If it comes to a choice between machining a hub or machining disc with a hole match a standard hub I think you find it will be much less costly to machine a disc with the correct hole size.