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AndyCW

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Everything posted by AndyCW

  1. AndyCW
    The manner in which you mount the springs to the axles will cause issues. They are likely to slide of of the pin. I would recommend putting the 'spring axle mounts' in double shear. It also looks like you will have problems with the 9l links popping off of the balls or the ball pins popping out of their location. They should be trapped. v/r Andy
  2. AndyCW
    Four links can come in two varieties. Triangulated and non triangulated. Here is a link to some triangulated four links on a Lego rock crawler. (The pics are too big to post here.) The links are of the 9l type with upper links narrowing on the axle and lower links narrowing on the chassis. http://imgur.com/a/5wB1X Non triangulated four links need panhard bars or a watts linkage to center the axle. The suspension in 9398 is a torque arm suspension.
  3. AndyCW
    Effe, Thanks for the suggestion. I ordered a set of the drive shafts and the new 8880 style wheel hubs. v/r Andy
  4. AndyCW
    Effe, Could you create a 'female universal joint adaptor for piece 2907' with a slide akin to your u-joint with slide parts? This plus the slide part from this This will allow strong telescoping drive shafts and support peculiar lengths. very respectfully, Andy
  5. AndyCW
    NICE! Triangulated 4-links are the way to go for extreme articulation.
  6. AndyCW
    You can make that truck 4x4, but it won't perform all that well due to the differentials, CV joints, and independent suspension. If it were me, I would craft a 4-link live axle chassis and place that body on top of it, but then I would realize how heavy the body was and where I could remove weight and then I would re-evaluate the gear ratios I needed due to the new lower weight and on and on in a never ending cycle of change. v/r Andy
  7. AndyCW
    Awesome. I'm not a big fan of the rear suspension setup, but other than that it seems pretty lively and entertaining. You mentioned greasing the axles. What do you use for grease? v/r Andy
  8. AndyCW
    There is potential in this design, but you do need to lower the suspension and lower the chassis. What's the pole reverser for? v/r Andy
  9. AndyCW
    Looks amazing. The front overhang looks a little terrifying. It reminds me of the Top Gear episode where they struggled to get the Pagani Zonda out of the parking garage. Maybe you could make a street version with slightly less aero. v/r Andy
  10. AndyCW
    It's good to see another Texan on the forum building crawlers and this one looks like it is pretty capable. You may be able to use less gearing with the torque of the xl motors and gain some wheel speed. In conjunction with a move to the Lipo battery it might really 'fly'. v/r Andy
  11. AndyCW
    I am one of the AFOLs who use 3d printed parts, s-bricks, modified pieces, and a robotics grade motor controller/2.4 ghz receiver. I try to do it in moderation in order to get the best reception within the community and as a challenge to myself. I'll turn a module around and around through numerous iterations trying to avoid the use of such elements and sometimes I succeed. Other times, the non-lego solution provides a unique functionality that becomes the base of a MOC. Each MOC is founded on something that I think is unique, I enjoy seeing other peoples builds and deriving inspiration from them, but have little interest in building someone else's MOC. That path involves discovery, not innovation and I can discover through pictures and this forum. It appears that third party tires and S-brick have a fairly high level of acceptance here as opposed to other options. Also the question of legality and what not may not be a black/white dichotomy, but exist along a grey scale. People argue about what counts all the time, if there were no argument, then the dichotomy may be true. I am puzzled by people who assert that once you have deviated the slightest bit from some 'ideal' you might as well abandon the Lego system. That smells of, "You're either with us or against us", but only Sith deal in absolutes v/r Andy
  12. AndyCW
    That looks fearsome. Hoping for a video soon or at least a report. Make sure you test it to failure so we know where the weak points are. v/r Andy
  13. AndyCW
    My experience is that the differentials will not break, the 3l diff may slip from the pinion gear. The problem comes from the bevel gears inside of the differential and how they are abused. Total forces imparted matter, but so does shock loading. I had a differential that if the power was applied slowly would stall out two 5292 motors before it broke anything, but if there were shock loads, like when there is wheel hop, the the gears could shatter. If you can keep the wheels one the ground, then they should last longer. The same holds true for regular automotive drive trains, wheel hop or chatter can break things just as much as total forces involved. v/r Andy
  14. AndyCW
    I also use that motor controller. It's good stuff. Building structures for this power level is a new challenge. You might want to investigate using small turntables for the pivot points on the rear swing arms so that the drive axle isn't also load bearing. Otherwise; I foresee bad things happening to those 5.5 stud axles and their mates on the front side of the swing arm. Looking forward to videos. v/r Andy
  15. AndyCW
    This looks promising. 4x 5292 motors at full throttle will suck that battery dry very fast. Hopefully the structure and gears hold together. Keep us posted with what happens when you out in the motor controller. BTW which controller are you getting? v/r Andy
  16. AndyCW
    Ahhh.... the joy of breaking u-joints with rc lego vehicles. Their strength with depend greatly on how they are implemented. Place them inside of the 'ball joint' and they are pretty strong. Keep the angle of them to a minimum and they are stronger. Try to place them upstream of the most forces in the drive train. Mount them securely. Lastly; avoid shock loads. Congrats on finding a weakness in your design. It means that you have more fun ahead of you correcting it. v/r Andy
  17. AndyCW
    Looks great. It seems that you have a 'leg up' on the rest of us in relationship to our first MOCs. Looking forward to more of your creations. v/r Andy
  18. AndyCW
    Nice! The scale is nice and the fact that it is an every man car is another reason to like it. It has a ' ' vibe to it. I'd drive the hell out of that.v/r Andy
  19. AndyCW
    Looks great. Reminds me of the yellow model team jeep that I had as a kid. v/r Andy
  20. AndyCW
    9.6v will be ok. https://social.sbrick.com/forums/topic/184/chip-tuning-feature v/r Andy
  21. AndyCW
    The old part was loose. I was worried that they would deform under load and cause the joint to fail. I had an 'old ball cup' fail, but don't know why. The new part is tighter and more rigid than the old ones. The friction is noticeable, but after some use they should wear in. A drop of lubricant should help. Hopefully the rigidity helps with the strength. Initial testing confirms this hypothesis, but final results will have to wait until more in depth testing can be undertaken. Here is the folder of pictures of my test chassis. It has changed quite a bit, but the overall idea can be seen. The 24t clutch gear had been replaced. Words of wisdom, the female part is much stronger than the male part. The printed axle stub is weak and can twist off with little stress. The Lego axles are much stronger in torsion than the printed axles. v/r Andy
  22. AndyCW
    Wow! They have so much detail for something that performs so good. I'll jump on the new rc motors bandwagon. I also like the ascetics of the tube chassis picture. v/r Andy
  23. AndyCW
    At the speed that most Lego crawlers operate, there is little need for shocks, but there is a need for articulation and that can come from linked pendular axles. Some builders use flex axles as leaf springs. v/r Andy
  24. AndyCW
    Wow!! Designing lego to handle these kinds of forces is no small undertaking. I love the capability. With that much torque per wheel is there any chance of trying 12/20 gearing in the portal hubs? It also would circumvent the weak point of the 8t gear. v/r Andy
  25. AndyCW
    It's cool that you shared the math behind the kinematic equations in your build. The one and only kinematics course that I took made my head spin. Matrices make everything easier and faster, but it's no fun to work out on your own. Yikes! The math in that course almost turned my brains into tater tots. It's also nice to see something other than a vehicle even if that's all I build. v/r Andy
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