[chbot] Chchrobotics Digest, Vol 133, Issue 10

[Charles Manning]

Sometimes dithering (ie. actually adding noise) is a good way to overcome
stiction.

On Thu, Oct 18, 2018 at 1:01 PM Marshland Engineering <
marshland at marshland.co.nz> wrote:

> Had a flurry of replies.
>
> Here is the setup.
>
> http://www.marshland.co.nz/ftp/CAM/Jig.JPG
>
> The data
>
> http://www.marshland.co.nz/ftp/CAM/Plots.jpg
>
>
> A very small step in measuring makes a huge step in the velocity graph and
> a
> similar one in the acceleration.
>
> Since posting, I did think about letting the cam run through several cycles
> and the averaging the new data. Probably best to do that first. It is the
> stiction that is the probable issue with the linear encoder. I am
> measuring to
> 1 micron.
>
> Maybe best to not average the raw data but average the velocity.
>
> Cheers Wallace
>
>
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