Saturday, April 28, 2007


Fixing the z-axis encoder

The AS50305 chip that does shaft encoding for the z-axis is in a very awkward location. The little board that holds it comes out of alignment quite easily and when it does I lose z-axis control of Tommelise's positioning system. When I was tapping the z-axis controller once per layer this was no big deal. Now, however, I have to use the z-axis every time I jump from one line segment to another.

As you can see it is under the x-axis gantry and behind the xz positioning plane. That means that if it gets out of alignment you're working with a flashlight and your fingertips and praying that you don't pull one of those fine little filaments that connects the AS5035 to the stripboard fragment that it's mounted on.

(Read the rest of the story)

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