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Technic - rotating a liftarm - ideas?
I need to rotate a liftarm from a servo motor, in quite a small gap. Ideally I'd just attach the liftarm directly to the motor axle (I'm using a third party slimline servo, so can glue any connector onto the axle). However, using a friction pin is not going to allow enough torque in the rotation. What I really need is a liftarm with a x or + in the middle so I can use a + pin on the axle to rotate it. Has anyone got any ideas how to drive it. The best so far is to use a pulley wheel (with it's + hole) and connect the liftarm across it with two 1.5 length pins but this makes it a bit too bulky in the centre and obvioulsy increases the thickness. I've tried various combinations of thin liftarms too.
Any better solutions?
I really wish there was a liftarm with a + hole in the centre.
I know an alternative is to glue the friction pin in place, which is probably what I will end up doing.
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I'm then using a pulley wheel 4185 which connects to the centre of the liftarm with two 3/4 pins 32002 (not the 1.5 as mentioned earlier, I refer to a normal pin as a 2 as it has two sides). This works perfectly, but I'd rather lose the large pulley wheel if possible. It connects to the motor spindle with an axle pin, the axle into the pulley and the pin side glued to the motor spindle.
I just wish they made stright versions of this, I cannot believe I am the only person that has ever wanted to spin a liftarm around an axle in a controlled way!