Returning to the original post about 'Classic and less classic Linear Actuators', we can see that Alex (AVCampos) posted there a comment with another simple and elegant design from himself, for a Linear Actuator (LA), that may haven't got your attention. So I decided to make here a new post with his design together with a few others.
Alex's solution, is more compact and more precise, because there are no half bushes to slide over the axles and the small gears doesn't slip also, by construction. See the render below, which speaks by itself and should be very easy for you to reproduce.
Meanwhile also got a mail from my friend Mauricio (who runs iLegos store at eBay), with his own ideas about the subject. Look at his awesome designs too, despite being just a preliminary test exercise. It's great to see a LA, with such a long rod and PF powered. :)
Something tells me, that after this test, there is more to come in the short term... ;)
...and since we are talking about LAs, take a look on a few more designs copied below and taken from here.
Below also a small video from a TBs reader (Karl Kangur), where he shows its own application for the usage of a LA device.
However I guess most of you are willing to put your hands on the upcoming, integrated LEGO TECHNIC Linear Actuators, like those we can preview on the new Excavator (8294). ;)