Actually I have a very specific potentiomter in mind because of it's price and construction. So the shaft length is limited to be quite short. The friction problem seems to have enough solutions for now, all of which would probably work. The real problem seems to be how to mount a threaded rod as a lever onto a potentiomter shaft!
I'm basically looking for something like this:
**broken link removed**
But in the dimensions I need which are mainly 1/4" bore, M4 hole on the flat side, and less than 8mm in thickness. How much do machinists charge to get about 8 of these made? Anyone have an idea at all?
whay dont you think about a coupling it itself will work as a friction torque device too?
I usually use rubber o-rings for stuff like that. You can notch the shaft and use an o-ring inside a tube, to give a friction fit.
You can also just wrap the o-ring around the shaft 1 or more times, and anchor the other end of the o-ring to something (like a screw head). The tension adjusts the friction. Then a touch of grease, vaseline etc and it should last for years.
Actually I have a very specific potentiomter in mind because of it's price and construction. So the shaft length is limited to be quite short. The friction problem seems to have enough solutions for now, all of which would probably work. The real problem seems to be how to mount a threaded rod as a lever onto a potentiomter shaft!
I'm basically looking for something like this:
**broken link removed**
But in the dimensions I need which are mainly 1/4" bore, M4 hole on the flat side, and less than 8mm in thickness. How much do machinists charge to get about 8 of these made? Anyone have an idea at all?
Hi dknguyen,
An easy way to make a friction disk for a lever actuated pot arm is
This would be the easiest and strongest way and with having adjustable tension you could set it to overcome any vibration. Below is a paint mockup of what I mean.
- make the lever arm which will go on the inner part of the pot shaft
- make a disk that is a pressfit on the shaft and put some rubber/leather on the face.
- make a sliding disk that will slide on the pot shaft that is spring loaded and adjustable then a bolt/set screw can be used for the tension.
View attachment 37855
Cheers Bryan
What ever you do, you have to watch putting too much spring pressure on the pot shaft. If you load it too much you risk breaking the resistance disk in side the pot, or wearing it too much.
How many of these are you talking about making?
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