APlanimeter can calculate areas of shapes, it is just what this creation do but it is built with Lego Technic pieces, one more of the machines and devices [ 1, 2, 3, 4, 5] that Nico71 has built.
As video description says:
"Modified polar planimeter of pritz concept.When the tracer point moves along a line (here the surface), the wheel follows a tractrix. Note that the path of the wheel is always tangent to the planimeter (here is the integration phenomen) The angle between the initial and final positions of the wheel is roughly proportional to the area of the surface. The constant of proportionality is the square of the length of the planimeter. The longer the planimeter, the more accurately the area is measured."
The MOC contains:
- 2 NXT units
- 6 NXT motors
- 1 Ultrasonic sensor for spotting movement tot start the program
- 1 Touch sensor for starting other programs
As written by Barman:
"De hand moves by 2 motors. 1 For moving the hand up and down en the other for rotation the hand. It can rotate 360 degrees, but the 4 not so flexible NXT cables make that difficult.
To hold the heavy hand, the wrist needs to be very strong, but also compact. I order to do that. I finally came up with a U-shape wrist section that holds a rotating tube with 2 pressure rings. This is the fourth version that finally works.
The rings are motorbike wheels (BL 88517), which can be connected to a Technic studless beam on the outside. The first wheel holds pressure on the turntable. Without it the turntable would detach from it's base, due to the weight of the hand. The second wheel conducts the weight of the hand to the rest of the wrist construction.
The hand holds 4 NXT motors to control the fingers and thumb. The 4 fingers are controlled by the 2 outside motors, that are attached to the index finger and pinky. All fingers are connected to a sliding beam, so that the middle and ring finger can also move. This system makes the hand compact, because you don't need 4 motor for each finger. The drawback is that the fingers can't be move separately. Anyone who has seen this always asks if it can give 'the finger', the answer is NO :)
The middle motor has 2 functions. It moves the thumb from and towards the hand. When the motor rotates further it touches the construction that make the fingers spread. So the thumb first moves a bit and the last past of that movement the fingers spread as well. The last motor moves the thumb in and out. It give a nice impression as a palm of the hand.
This hand was made for showing hand movements and not for grabbing. The construction isn't strong enough for grabbing.
In the near future I will reprogram the hand to make other movements."
Sorting large amounts of technic parts is usually boring, but some technicians use to make this work much easier, like the PIN SORTER of Itchy4000 or this astonishing machine made by Akiyuky, casually mentioned in the previous post, this machine is able to classify and sort all existing axle lenghts, all with only one LEGO PF XL motor and as usual a clockwork precision and smartengineering.
Philip Verbeek has uploaded a video featuring a Lego GBC, mixing pneumatics and mechanic sequences, so smart details, ideas and mechanism uses, it makes me remember the creations of Sqiddster, the ball factory of Akiyuky or the creations of Superbird28. Quite nice loop.
I just realized that this blog has just reached the two years old!!!
Thanks to all subscribers in blogger, rss, youtube playlist, Facebook, all the blogs and sites who link here and for all the readers, this blog is for all of you and it seems that you like it so it will keep showing funny and interesting content related mainly to the Lego Technic.
I would make contests and celebration parties but my pocket is empty... for now, so just stay tuned to the blog and the upcoming 2nd Technic weekend, soon more information ;-)
