Zerobricks Posted October 9, 2014 Posted October 9, 2014 This model is a direct evolution of the wolf. Here's a lil something I've been cooking up so far in LDD: So far the lower part should be functional. The legs are built in such manner, they are always parallel to the ground/each other. The four LAs are for lifting and lowering the entire machine: In order to walk the special system of cams is set in suc hammer that the legs are always 180 degrees apart: In order to steer and help by walking each of the feet also has a turntable in order to rotate the whole model in its...erm toes? And to keep the model balanced the (here not connected) 9L links tilt the upcomming body in such manner the weight is aways at the extended leg. The tilting is controlled by forward moving functions of the legs and cannot be out of sync: So far I used 5M motors for 3 functions: 1M motor to walk 2M motors to lift both legs 2M motor to rotate feet - they dont have to be independent as usually there is always one feet on the ground I still plan to use 5 more M motors for: 1M motor for rotating the upper superstructure 2M motors to lift/lower arms 2M motors for the arms upcoming functions (grab/shoot) So what'ya guys think? Quote
Edwin Korstanje Posted October 9, 2014 Posted October 9, 2014 This is one great idea Zblj, can´t wait too see more off it. Quote
BusterHaus Posted October 9, 2014 Posted October 9, 2014 I'm pretty sure the 3L half beams (marked with orange arrows) will have too much stress applied to them, especially if you are planning to add battery boxes and 5 more motors on top. They'll either flex the axle or slip off it. From my experience there the joints on large bipeds require a lot of reinforcement. The alternative is to build as light as possible, which limits the number of functions you can have. Quote
jorgeopesi Posted October 9, 2014 Posted October 9, 2014 This is one great idea Zblj, can´t wait too see more off it. Same here . Quote
HorcikDesigns Posted October 9, 2014 Posted October 9, 2014 Looking forward to see it, but I have to agree with BusterHaus . I'm pretty sure the 3L half beams (marked with orange arrows) will have too much stress applied to them, especially if you are planning to add battery boxes and 5 more motors on top. They'll either flex the axle or slip off it. From my experience there the joints on large bipeds require a lot of reinforcement. The alternative is to build as light as possible, which limits the number of functions you can have. Quote
Zerobricks Posted October 9, 2014 Author Posted October 9, 2014 Looking forward to see it, but I have to agree with BusterHaus . There arms are reinforced on the other side... So there are in total of 4arms/leg Quote
BusterHaus Posted October 9, 2014 Posted October 9, 2014 The Z axis looks quite strong because of the 4 links, it's the lateral strength that's a bit of a concern to me. I guess this will get answered once you build it. Quote
grum64 Posted October 9, 2014 Posted October 9, 2014 My God! Where on earth do you start with a build like this? I can't wait to see the finished result I don't know how I missed your incredible Cheetah until now. It's an astonishing build. Hats off to you Zblj Quote
Zerobricks Posted October 19, 2014 Author Posted October 19, 2014 I just ordered some missing bricks and should be starting building this thing next week Quote
nerdsforprez Posted October 28, 2014 Posted October 28, 2014 Best of luck, but after only admittedly a cursory review of the model, I think that there will be too much weight on the actuators for any real functioning. Quote
Zerobricks Posted October 28, 2014 Author Posted October 28, 2014 Best of luck, but after only admittedly a cursory review of the model, I think that there will be too much weight on the actuators for any real functioning. I think that too, I will need more gearing, 1:1 ratio for 2 LA's isnt going to be enough... Will keep you guys updated. Quote
Zerobricks Posted October 31, 2014 Author Posted October 31, 2014 If anyone is interested here's today progress... As you can see the arms are still missing, but its getting there. Quote
Fissl Posted October 31, 2014 Posted October 31, 2014 looks nice so far! does it allready walk? Quote
Zerobricks Posted October 31, 2014 Author Posted October 31, 2014 No not yet because the body is not heavy enough to act as a counterweight. But it can lift itself. Quote
Milan Posted October 31, 2014 Posted October 31, 2014 Great! How is the stiffness? Is it woobly? You could build these legs, and I could mount upper section of my Bodybuilding Terminator :) Quote
HorcikDesigns Posted October 31, 2014 Posted October 31, 2014 Wow, it looks great so far, but I see you have reached the limit of maximum of PF motor powered independent functions. So, are all motors you plan to use mounted on it, or not? Quote
Zerobricks Posted October 31, 2014 Author Posted October 31, 2014 There are 2 more motors coming. Lifting and leg rotation will be common for both sides. The legs are incredibly stiff, thanks to the LA's which are rock solid. I just hope the body will provide enough counterweight for walking. Quote
MajklSpajkl Posted October 31, 2014 Posted October 31, 2014 How will you ensure transversal moving of the centre of gravitiy, or is it possible, that this puppy will not fall when one leg is lifted and the centre of gravity doesn't move to the oposite side? Otherwise - good progress so far :) Cheers Quote
Lucio Switch Posted October 31, 2014 Posted October 31, 2014 I seem to see the basis of a ED-209!! Very interesting!! Quote
Zerobricks Posted October 31, 2014 Author Posted October 31, 2014 (edited) The center of gravity is linked to the leg movement so when one leg moves down the upper body tilts in a way to help shift the center of gravity. At the moment the body is not yet finished and doesnt have the full mass, but the shift is effective enough for this puppy to walk already: Edited October 31, 2014 by Zblj Quote
Zerobricks Posted October 31, 2014 Author Posted October 31, 2014 Yeah its funny at max speed... Thats good because it means there is more than enough power left to make a nice body, etc... Quote
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