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I'm not aware of an official LEGO Power Functions optical switch but considering that PF is based on simple electric components it could probably be hacked together at the cost of sacrificing an offic …

There are many kinds of LEGO string, which are compatible with pulleys, but they are not closed in a loop, but manufactured as a single thread. You could tie a knot on them to form a loop, but the str …

It is not spring loaded, meaning if you set a dial to a specific value it will stay there. There are two channels that can be controlled with the two dials, and either can be set in one direction ("fo …

This can have many causes, starting at the gearbox, followed by the transmission of torque to the turntable, the build of the turntable itself and as Joost wrote, the pneumatic hoses or other componen …

You have two of three right: One position is the Drive, where the wheels are connected to the engine via the gearbox The middle is the Neutral, where there is no connection between the wheels and th …

If you don't need the arm to be extendable then you might get some ideas from the various Technic sets that feature cranes or claws, like the 8868, 8479, 8436, 8110 or 9397. …

You can build your own trap door from System and Technic pieces. … Use plates for the surface and frame (maybre reinforced by bricks if necessary), and attach one or more (depending on the weight and size) Technic joints underneath. …

I was going to recommend lubricating the pistons, but seeing you already did exactly that, I can only say you should try to isolate the source(s) of the problem. Since you have at least one working c …

This depends on how deep engineering principles do you wish to teach. For simpler, shallower things, like the inherent stability of a triangle based construction versus a square based, the crawler cra …

The best way would definitely be to appeal to his already existing preferences and show him how LEGO Technic can integrate into that or even enhance that. Does he like cars? … approach the topic as a common learning process, where you both venture out to explore the world of LEGO Technic. …

First of all, let's get some basic questions out of the way: Do any of the functions work correctly in any directions? If only some functions fail to work, then we can narrow the search to those. Is …

One possibility is the Technic, Gear 8 Tooth without Friction. It was specificially designed to allow axles to slide through it. …

Another type of pullback motor has a detailed structural disassembly here: Imgur album. I think your motor should work mostly the same way, but I wasn't able to source such internal pictures. LEGO …

why are the Lego designers seemingly not aware of this and haven't they addressed this in later technic sets? …

Another solution, which, depending on your definition of "moderate torque", could be sufficient. Note the 1 stud long bush not being in click, in order to increase friction between the blue pin with …