Sarrus linear axis with RC Servo

Here is my page about a promising linear axis that uses an RC servo.

[objects.reprap.org]

fdavies

It's a nice bit of work. I'm quite impressed.

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-Sebastien, RepRap.org library gnome.

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Wow, that's really cool!

I see you're using double joints on each side... Is it overconstrained? How precise do you think the parts have to be?

It is definitely overconstrained. One reason that the walls that the sarrus arms are connnected to are so thin is to allow them to flex slightly and make up for that. The parallelogram parts of one of the sarrus elbows will try to put a torsional twist on the other elbow.

The way that it looks to me, the small hinges that I am using are not strong or stiff enough to work without using a lot of them. This mechanism is going to have to flex a little to make up for imprecision. Fortunately, the plastic is good at flexing.

fdavies