Cubix Posted March 22, 2011 Posted March 22, 2011 I still have very few experience with this forum, so sorry if there already was a thread like this(which I do not expect). My question would be: Is it possible to build a perfect circle, that is split into 6 sections? What I mean is a circle made of 3 parts on the one half, and three on the other one. The gaps must be parallel...any ideas? Hope you can help me out... Quote
grindinggears Posted March 22, 2011 Posted March 22, 2011 I don't think that is is possible to build a perfect circle but there are many good examples for nearly circular geometry, e.g. this one: http://technicbricks.blogspot.com/2010/02/tbs-techtoc-08-racing-bike.html To get a six-segment-circle you might want to start with two of these parts: Or maybe this one will help you: It might help us to better understand your problem if you could explain it in more detail or with photos. Feel free to send me a PM if you want to contact me in German. I'm curious what you are about to build! Quote
freakwave Posted March 22, 2011 Posted March 22, 2011 I still have very few experience with this forum, so sorry if there already was a thread like this(which I do not expect). My question would be: Is it possible to build a perfect circle, that is split into 6 sections? What I mean is a circle made of 3 parts on the one half, and three on the other one. The gaps must be parallel...any ideas? Hope you can help me out... A lot depends on how you define the perfect cricle. Makeing a 6-segment thing in Technic is no issue as there are plenty of parts that give you a 60 degree angle. How large you want to make the circle? How many studs should the radius be? How smooth should be the outer side? Should it look like a hexagon or do you want the sixth to be further divided? Think of those and then take Phytagoras and do the math Have a look my smaller ferris wheel. It is quite close to a circle having 43 sections. Now this does not divide very well by six but if you take 13L Liftarms instead of 15L Liftarms you will end up with 36 sections. I make a spreadsheet for the calculation to find a good match in terms of Lego-Units/studs (+/- 0.05 studs) in order not to stress the construction too much. But be ware! this IS parts intense, 516 thick liftarms (5, 7 and 15L), 334 thin Liftarms (5 and 7L) and finally 516 long technic pins. Keeping the two halfes together are a few axle 12L and technic pins with bush fW Quote
DLuders Posted March 23, 2011 Posted March 23, 2011 @ Cubix: As discussed at the very bottom of this Eurobricks post, one could make a 6-spoke central hub using these parts: 2695 "Wheel 30mm D. x 13mm (13 x 24 Model Team)" x241 "Hinge Cylinder 1 x 3 Locking with 1 Finger and Technic Friction Pin" 30561 "Hinge Cylinder 1 x 2 Locking with 2 Fingers and Axle Hole On Ends" 2 ea. (typical) Technic axles, such as the 3737 "Technic, Axle 10" 6538c "Technic, Axle Connector (Smooth with x hole + orientation)", placed between the two axles Then, on the ends of each of the six Technic Axle "spokes", one could attach a 32013 "Technic, Axle and Pin Connector Angled #1": Stick 2 ea. 4274 "Technic, Pin 1/2" into the 32013 parts, with the short end pointed towards the center of the 32013 piece: Finally, get some Soft Axles and insert the ends into the Technic 1/2 Pins. You have a (near) perfect circle. Quote
Cubix Posted March 23, 2011 Author Posted March 23, 2011 (edited) @ Cubix: As discussed at the very bottom of this Eurobricks post, one could make a 6-spoke central hub using these parts: 2695 "Wheel 30mm D. x 13mm (13 x 24 Model Team)" x241 "Hinge Cylinder 1 x 3 Locking with 1 Finger and Technic Friction Pin" 30561 "Hinge Cylinder 1 x 2 Locking with 2 Fingers and Axle Hole On Ends" 2 ea. (typical) Technic axles, such as the 3737 "Technic, Axle 10" 6538c "Technic, Axle Connector (Smooth with x hole + orientation)", placed between the two axles Then, on the ends of each of the six Technic Axle "spokes", one could attach a "Technic, Pin 1/2" into the 32013 parts, with the short end pointed towards the center of the 32013 piece: Finally, get some Soft Axles and insert the ends into the Technic 1/2 Pins. You have a (near) perfect circle. Thanks to all of you. Unffortunately, that was not exactly what I was searching for. I don't want to build a kind of cheese made of 60-degrees parts, but a circle, that is first split into two halfs, and then each half is split into 3 segments - but only using parallel cuts...I don't know how to describe it... Imagine you take 6 squares and put them together so you get a 2x3 plate. Now you draw a circle so this circle is cut into 6 parts by these squares. I will try and make a picture later if I still didn't describe well enough... anyways, thank you! Edited March 23, 2011 by Cubix Quote
DLuders Posted March 23, 2011 Posted March 23, 2011 So, if you cut the 4750 "Fabuland Plate, Round 13 2/3 Stud Diameter - (Ferris Wheel Side, Merry-Go-Round Type 2 Base)" (pictured below) with a jigsaw, so that the cuts are ALONG or PARALLEL TO the rows of studs, you would get 6 pieces? Quote
Cubix Posted March 23, 2011 Author Posted March 23, 2011 So, if you cut the 4750 "Fabuland Plate, Round 13 2/3 Stud Diameter - (Ferris Wheel Side, Merry-Go-Round Type 2 Base)" (pictured below) with a jigsaw, so that the cuts are ALONG or PARALLEL TO the rows of studs, you would get 6 pieces? Yes! But nor I've got this piece neither I want to cut my Legos :( But thats the idea, exactly... Quote
allanp Posted March 23, 2011 Posted March 23, 2011 How big would you like the circle? How strong would you like it? What funtion is it to perform? Quote
Cubix Posted March 23, 2011 Author Posted March 23, 2011 oh you're right. Well, the size should be small - 14 knubs or less as the diameter would be perfect. The circle should be a real circle, not an egg :). Also, the six parts must be stabil individually(and must not have to be connected to the other ones). As you may expect, it has to turn inside of - or around - another circle(this second one does, of course, not have to be perfect). Not that easy to explain what exactly I am willing to build. Quote
grindinggears Posted March 23, 2011 Posted March 23, 2011 So you want to build a rubiks cube? This is nearly impossible with Lego at all. On Brickshelf I found this one: The corner pieces have to fit in a circle in three dimensions! Maybe this piece might help you: Honestly I am a bit sceptic whether such a model can be realised with Technic elements Quote
freakwave Posted March 24, 2011 Posted March 24, 2011 oh you're right. Well, the size should be small - 14 knubs or less as the diameter would be perfect. The circle should be a real circle, not an egg :). Also, the six parts must be stabil individually(and must not have to be connected to the other ones). As you may expect, it has to turn inside of - or around - another circle(this second one does, of course, not have to be perfect). Not that easy to explain what exactly I am willing to build. Can you add a sketch of what you would like to build? Kannst Du eine Zeichnung von dem was Du bauen willst hier reinstellen? Quote
Cubix Posted March 24, 2011 Author Posted March 24, 2011 http://www.pic-upload.de/view-9350257/Erkl-rug....png.html I hope the link works... That's around what I am willing to build. Btw, thanks, these pictures on bricklink look nice, so I am going to try and build this version of the cube that I didn't know! Quote
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