[chbot] Knob shafts / extensions and insulation

[Mark Atherton]

Found some plastic shaft units:

Search "EC12 encoders" on AliExpress, or eBay

My fav on AliExpress "8 foot long shaft encoder 16 files 25MM"

http://www.robotshop.com/en/parallax-incremental-rotary-encoder.html

http://www.robotshop.com/en/5v-mechanical-quadrature-encoder.html

HTH, Mark

On 30/08/2016 11:28 PM, Volker Kuhlmann wrote:
 > I'm planning to put a mains voltage circuit into a suitable box with
 > clear lid. One knob will have to come out through the lid. I'd like a
 > rotary encoder with push switch - unfortunately, push switch and plastic
 > shaft seem to be mutually exclusive. I can't find plastic shaft
 > extensions either.
 >
 > Is it permissable to stick a metal shaft out through the lid, assuming
 > the mains voltage side is appropriately insulated and tied down?
 >
 > Suppose in another project a capacitive power supply is sufficent, and
 > Arduino runs on mains potential. Does anyone know a clever trick to
 > use a metal shaft encoder here (without surgical replacement and 3D
 > printed parts)?
 >
 > Thanks,
 >
 > Volker
 >