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Hello, A very simple way to produce an elliptical motion is to start with a circular motion and use a lever system to increase the travel on one axis but not the other. Here are a couple of links to some walkers I've made as illustrations: (URL) (...) (20 years ago, 25-Aug-04, to lugnet.technic)
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| | Re: Review: 8436 Truck
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(...) Heheheh. When I wrote the review 1999 was nostalgic enough for me, even though I do have two sets (8855,56) from 1990s. I must be in my second life. :) Keith (20 years ago, 25-Aug-04, to lugnet.technic)
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| | Re: How to get non-circular movements?
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(...) as used in the legs of the [LEGOSet 9754] I have reproduced a basic version: (URL) ROSCO (20 years ago, 24-Aug-04, to lugnet.technic, FTX)
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| | Re: How to get non-circular movements?
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"Joe Strout" <joe@strout.net> wrote in message news:I2x55x.Dt6@lugnet.com... (...) to my (...) this (...) some multiple joins allow to create what you want there are many examples how to create sophisticated moves using joined vectors (for me they (...) (20 years ago, 23-Aug-04, to lugnet.technic)
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| | Re: How to get non-circular movements?
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(...) In a stange tie in, I remember seeing a elliptical lathe on an episode of the New Yankee Workshop (a PBS woodworking show). A quick google search turned (no pun intended) up the following: (URL) (20 years ago, 23-Aug-04, to lugnet.technic)
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| | Re: How to get non-circular movements?
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(...) question at any of them, as far as I can see. Could you elaborate on how this applies? Thanks, - Joe (20 years ago, 23-Aug-04, to lugnet.technic)
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| | Re: How to get non-circular movements?
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(URL) regards pixel (20 years ago, 23-Aug-04, to lugnet.technic)
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| | Re: How to get non-circular movements?
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(...) Ah, I see. The pivot point must be free to slide on the arm (er, vice versa) as well. I think that's the key bit I was missing last night. (...) devices in my Technic models. Best, - Joe (20 years ago, 23-Aug-04, to lugnet.technic)
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| | Re: How to get non-circular movements?
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(...) (rather than operated by hand) will be nontrivial. But should be possible. Thanks for the pointer! Best, - Joe (20 years ago, 23-Aug-04, to lugnet.technic)
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| | Re: pneumatic help
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(...) Hi Vineet, I'll see if I can help. Your desciption "control four pneumatic pistons individually, and simultaneously having them controlled by one master switch" does not seem to match the second diagram. The primary reason is that you have (...) (20 years ago, 23-Aug-04, to lugnet.technic)
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| | Re: How to get non-circular movements?
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(...) Greetings, An "elliposgraph" aka "elliptic trammel" should be just what you need. (URL) (20 years ago, 23-Aug-04, to lugnet.technic)
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| | Re: How to get non-circular movements?
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(...) Have an arm attached off-center on a gear, running through a fixed pivot point (that is free to rotate!). As the main gear rotates, the distance between the driven end of the arm and the pivot point changes as the off-center attatchment point (...) (20 years ago, 23-Aug-04, to lugnet.technic)
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| | Re: why won't my biped walk?
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(...) Congratulations! Always happy to help out a biped fan. I love them. Make sure you take a picture and post it here, so you can be added to the "Walker Madness" list. (...) For me, building is about experimenting and exploring. Each of my MOC's (...) (20 years ago, 23-Aug-04, to lugnet.technic)
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| | How to get non-circular movements?
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Short question: how can I combine technic gears, arms, cams, etc. to make a motor-driven part that does not move in either a straight line, a circle, or an arc (i.e. part of a circle)? Long question: I'm trying to figure out how to drive an arm so (...) (20 years ago, 23-Aug-04, to lugnet.technic)
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| | Re: New MOC: large crane
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(...) Hi ROSCO, The slew ring uses a roller bearing based on the what-you-ma-call-it-...big-wheels wheels. For some strange reason it did not occur to me to use one wheel and then have a flat surface on the bottom of the upper works, so the ring is (...) (20 years ago, 23-Aug-04, to lugnet.technic)
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| | pneumatic help
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Kevin- I am in the design phase of my crane (the Demag AC 500-1 SSL) and currently I am working on the control system for the pneumatics. Following Ross Crawford's idea, I came out with something like this: (URL) am trying to control four pneumatic (...) (20 years ago, 22-Aug-04, to lugnet.technic)
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| | Re: New MOC: large crane
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(...) finished! I like the use of technic turntables for the crawler sprockets. Did you also use a technic turntable for the slew ring? ROSCO (20 years ago, 23-Aug-04, to lugnet.technic)
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| | New MOC: large crane
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Hi, After working on it for one year (on and off), I've finished a large, crawler crane. Read all about it here (scroll past my minifig crane to the bottom of the page): (URL) (20 years ago, 23-Aug-04, to lugnet.technic) !!
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| | Re: why won't my biped walk?
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(...) Just a follow-up -- all I had to do was slightly redesign and reattach the feet, with the cam-driven connection on the outside and the stabilizing connections on the inside. It now walks quite reliably! Very cool. This bot is cute in a sort of (...) (20 years ago, 23-Aug-04, to lugnet.technic)
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| | Re: why won't my biped walk?
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(...) I think you're right. For the record, I tried simply shifting the foot plates in one stud each -- and this does sort of work; the bot now wobbles a lot but, most of the time, actually transfers from foot to foot. But I think your analysis (...) (20 years ago, 23-Aug-04, to lugnet.technic)
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