Electronics > Projects, Designs, and Technical Stuff

Wanted: non-flimsy rotary encoders

(1/2) > >>

pastaclub:
I’m looking for rotary encoders which are sturdy enough so that the shaft doesn’t wobble around when you just slightly touch it. (I mean those simple 3-pin A,B quadrature ones with 24 positions and no detents, typically 12x12mm footprint, snap-in PCB mounted, as they are used for example in digital oscilloscopes).

The problem is (as seen on the bottom side) that the tolerance of the hole around the shaft is very generous and with a 25mm long shaft plus knob, you can move the knob to the side by more than 1mm while it should ideally just rotate around the Z axis.

I tried Bourns, ALPS Alpine and Song Huei - they are all flimsy (while their potentiometers are not).
Any part recommendations?

I would be fine with a PCB-mounted version with metal shaft (i.e. one that is mounted on the bottom side of the PCB, with the shaft and pins facing upwards through the PCB, and a nut is installed on the top side) but it seems that only potentiometers, not encoders are available in such packages.

…and it should still be affordable, since it’s not for a spacecraft and I need many of those.

tooki:
Can you add shaft stabilization through the mechanical design of your enclosure? For example, by providing a bushing the shaft passes through?

I could even imagine designing a bushing that screws onto the threads of a rotary encoder.

Or you can do what many products do and stabilize the knob rather than the shaft.

And finally, the likely most common approach: keep your shafts as short as possible by mounting the encoder as close to the front panel as possible.

pastaclub:
Having a tight tolerance hole in the front panel sounds like the easiest remedy. I’d have to try that. I’m just worried that (with many encoders on the PCB) it will become difficult to install the front panel.

Do you have examples of stabilized knobs?

xvr:
> I would be fine with a PCB-mounted version with metal shaft (i.e. one that is mounted on the bottom side of the PCB, with the shaft and pins facing upwards through the PCB, and a nut is installed on the top side) but it seems that only potentiometers, not encoders are available in such packages.

This one? https://www.digikey.ie/en/products/detail/bourns-inc/PEC11R-4220K-S0024/6164059

tooki:

--- Quote from: xvr on April 12, 2024, 01:00:18 pm ---> I would be fine with a PCB-mounted version with metal shaft (i.e. one that is mounted on the bottom side of the PCB, with the shaft and pins facing upwards through the PCB, and a nut is installed on the top side) but it seems that only potentiometers, not encoders are available in such packages.

This one? https://www.digikey.ie/en/products/detail/bourns-inc/PEC11R-4220K-S0024/6164059

--- End quote ---
No, that’s an ordinary one mounted on the top side of the PCB, but OP said one that mounts to the bottom side. They mean a reverse-mount unit, which does exist for potentiometers.

Navigation

[0] Message Index

[#] Next page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod