Question: The project is to rotate a load using a motor with a varying speed between like *2000-10000 rpm*.

I'm using a **flange coupling** to attach the cylindrical tube to the motor. Since I will rotate it to high speed, I think I need to tightly and safely attach the load to the motor. 

Do you have any suggestion on what coupling or what is the best way to attach the cylindrical tube to the motor **safely**?

NOTE: the shaft and load are the same lines. this machine is about centrifugal electrospinning which is a machine to fabricate a nanofiber. 

[![enter image description here](https://i.stack.imgur.com/JsGkQ.jpg)](https://i.stack.imgur.com/JsGkQ.jpg)

Answer: 
One can use the Flange Coupling with Key feature and Axis Support Fixed Seat.

Like this:

[![enter image description here](https://i.stack.imgur.com/qtpBZ.jpg)](https://i.stack.imgur.com/qtpBZ.jpg)

This design includes both. Also, one can find these off the shelf according to dimension requirements, or one can design one of them easily.

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For example: [JoyceDayton](https://joycedayton.com/products/system-accessories/couplings) 

[![enter image description here](https://i.stack.imgur.com/nX6DM.jpg)](https://i.stack.imgur.com/nX6DM.jpg)

For example: [Ebay](https://www.ebay.co.uk/itm/8mm-Flange-Coupling-Steel-Rigid-Flange-Coupling-Motor-Guide-Shaft-Axis-Bearing-F-/222683278447)

[![enter image description here](https://i.stack.imgur.com/vON9es.jpg)](https://i.stack.imgur.com/vON9es.jpg)

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Most importantly, after the calculation of the bolt torques, one can use **lock tight** in order to make sure rigid connection.
Normally, you would use two grub screws at 90 degrees to each other, to secure the load onto the motor shaft. I have done this to attach a stainless steel flywheel on a motor spinning at 6,000 rpm and it's holding just fine.

To give it extra strength, you can also use something like Loctite 638 to glue the flange coupling, or whatever coupling you should choose, to the shaft. This probably means the coupling needs to be metal, not plastic (although I'm sure there'll be other glues to bong plastic to metal). Note that Loctite 638 is pretty much permanent: once you've glued your coupling onto the shaft, it won't be coming off again (easily).