Here are assembly instructions on building a levered puck grabbing
mechanism. It was designed to pick the foam pucks used in the Workshop3D
RCX challenges but will also work with the RoboSport pucks and even certain
Lego Wheels with Tires.
This mechanism is shown without a motor as it is mainly intended to
demonstrate how the mechanism works. On my puck gathering robots I
connected one end of the axle directly to a motor using an axle joiner.
This makes the grabbing mechanism very quick and the motors should only
be run for a fraction of a second. I also used low power to initially close
the grabber then full power to lift and throw.
Qty Color Description
2 Light-Gray Plate 1 x 2
3 Light-Gray Plate 1 x 10
1 Light-Gray Plate 2 x 10
3 Black Technic Brick 1 x 8 with Holes
2 Black Technic Brick 1 x 16 with Holes
6 Black Technic Pin with Friction
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4 Light-Gray Plate 1 x 4
2 Black Technic Brick 1 x 4 with Holes
2 Black Technic Brick 1 x 8 with Holes
2 Black Technic Pin with Friction
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1 Black Technic Axle 12
1 Black Technic Brick 1 x 4 with Holes
1 Light-Gray Technic Bush
2 Light-Gray Technic Liftarm 1 x 3
2 Yellow Technic Liftarm 1 x 11.5 Double Bent
1 Black Tyre Small
1 Yellow Wheel Centre
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2 Black Technic Axle 4
2 Black Technic Axle 5
2 Light-Gray Technic Axle Joiner
2 Black Technic Axle Joiner Perpendicular
3 Light-Gray Technic Bush
1 Light-Gray Technic Liftarm 1 x 4
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NOTE: The five axle is partially hidden. Together with the 4 axle and
Axle Joiner, it basically becomes a ‘7’ axle. This ‘7’ axle is centered
within the frame so that it does not contact the vertical beams.
2 Black Technic Axle 4
2 Light-Gray Technic Axle Pin
2 Light-Gray Technic Bush
2 Black Technic Liftarm 1 x 9 Bent
2 Light-Gray Technic Liftarm 3 x 3 L Shape
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2 Black Technic Axle Joiner Perpendicular
2 Light-Gray Technic Axle Pin
2 Light-Gray Technic Bush 1/2 Smooth
2 Black Technic Liftarm 1 x 7
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