How to couple/connect a shaft to a disk?

  • Thread starter zuryum
  • Start date
  • #1
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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.

HRMUW.png


  • 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!
 

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Answers and Replies

  • #2
Mech_Engineer
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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:
s-l640.jpg
 

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  • #3
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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".
 
  • #4
779
526
Why must the hole be 3 inches? Why not make it smaller, and use an off-the-shelf hub?
 
  • #5
JBA
Science Advisor
Gold Member
1,540
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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.
 

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