DIY - How to make a potentiometer?

ronvieky
ronvieky
@ronvieky-RmIqBm • Oct 25, 2024

Hi,

I'm trying to set an apparatus or rather a tool, to measure the Diameter of a tube, pipe, etc.

Iinitially I just want to check the dia OD with this tool. In the later part, I want to check for eccentricity, thickness and ID of the tube as well. But for now, the OD is more than sufficient.

I was thinking of a small hand-held or fixture of a small wire, that can be looped around the tube, and pulled back through a small cylinder, to cover the tube completely.

The wire would form a basic potentiometer, and give the analog value of the tube dia.

My question is - how to build such an equipment, and what all parts would I need?

how complicated would this be? Can anyone please help? Its a simple mecha-electronics apparatus.

Maximum diameter of tube - 12 mm
Minimum diameter of tube - 2 mm
(different sizes)

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  • Munguti
    Munguti

    @munguti-MnxkmE • Jul 23, 2009

    Maybe you could use the wire to be one of the resistors in a wheatstone bridge. This would detect the change of its resistance which will be proportional to its lenght. This should give its diameter (from its cicumfrence ofcourse).

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