Is There a Fastener That Combines a Set Screw and Thread Hole for Mounting?

[tomizzo]

Hi there,

I'm looking for a specific type of fastener of which I don't know actually exists. I'm hoping someone here will be able to point me in a direction or give other advice.

In the simplest terms, I'm attempting to mount a rod and mass such that it can rotate on an encoder shaft. However, I don't what would be the best/most lightweight method for doing this.

Referring to the image (here - http://imgur.com/6YBB4S2), I'm hoping that there exists a device that has a hole with set screw such that it can be fastened to the rod. And then I also wish for this device to have a thread hole such that the rod can be fastened to it. Refer to the assembly in the lower part of the diagram.

Does such a device exist? Are there easier methods for doing this? I'm looking for a light weight solution.

Thanks!

 

[Nidum]

Meccano was the traditional source for oddities like this . Still lots of it for sale new and second hand :

http://www.meccano.com/

https://www.google.co.uk/search?q=m...ved=0CAgQ_AUoAmoVChMIp_mf74_tyAIVA-wUCh1UOQmI

And Fischer Technik :

http://www.fischertechnik.de/en/Home/products.aspx

Other technical toy kits also often have many useful parts for experimenting .

If it was me though I would just make one . Rough and ready version in ten minutes . Fully machined accurate version in 20 minutes .

 

[Nidum]

Have a look for some ideas here as well :

https://www.google.co.uk/search?q=s...-8&oe=utf-8&gws_rd=cr&ei=d_I0VrGZL8v1UqDZtIgF

For industrial stepper motors there are lots of standard shaft fittings available which could be used or adapted :

https://www.google.co.uk/search?q=s...ZL8v1UqDZtIgF#q=stepper+motor+shaft+couplings

 

[David Lewis]

A collar with two threaded holes might work (one hole for the setscrew, and one hole for the threaded rod). If the collar slips, a flat could be machined on the encoder shaft.

 

[berkeman]

Referring to the image (here - http://imgur.com/6YBB4S2),

Looks like you could just make your own using some thick PVC pipe with the right ID. Drilling and tapping plastic is easy...

 

[CWatters]

Perhaps just drill a hole through the potentiometer shaft. Put a threaded rod through the hole with a nut either side.

 

[rbelli1]

How do you plan on supporting the shaft of the encoder? They are not usually designed for load bearing.

BoB

 

[tomizzo]

Hi there rbell1,

The diagram I drew is not completely accurate in describing my design. I have a bearing that will support the load such that the force due the load will not hurt the encoder.

 

[berkeman]

Hi there rbell1,

The diagram I drew is not completely accurate in describing my design. I have a bearing that will support the load such that the force due the load will not hurt the encoder.

It would take two sets of bearing races to support the load, no?

 

[berkeman]

Great catch by @rbelli1 BTW..

 

[Ranger Mike]

http://www.mcmaster.com/#routing-collars/=zm8zlm