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Camera DRO

Using a webcam and OpenCV to replicate a Milling Machine Digital Read Out (DRO).

maxbareissMaxBareiss
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  • maxbareissMaxBareiss

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ongoing project
opencv machining

This project was created on 07/28/2018 and last updated 7 years ago.

Description

Milling machine Digital Read Outs (DROs) are expensive pieces of equipment that measure the position of the milling machine table. This allows the machine operator to line up features with each other on a part and put them precise distances away from each other. Without a DRO, using a milling machine is difficult and some operations aren't really possible. Things like bolt patterns are pretty easy to do with a DRO but without a DRO you'd need a rotary table, which is expensive.

The idea here is to use Charuco boards to locate the milling machine table. Charuco boards are paper and are cheap. Webcams are readily available. DROs usually cost around $400, this setup was made with parts I had sitting around.

Components

  • 1 × PS3 Eye Webcam

Project Logs
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  • Camera DRO Initial Testing

    MaxBareiss • 07/28/2018 at 18:38 • 0 comments

    Today the code was created and initial testing was done.

    TLDR

    Absolute accuracy of Camera DRO is about 2 thousandths. Relative accuracy is similar. This is way better than I expected.

    Read more »

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