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  1. powerwindows83

    [HELP] Open vs Locked Differential

    also i would like to get my hands on some of those torsens to do some strength and deformation testing, but at $11 a pop thatd get expensive quickly :/
  2. powerwindows83

    [HELP] Open vs Locked Differential

    it appears from the pitch of the worms that it requires a helical gear and thus cant handle any lego ones... efferman would have to reply to confirm that though
  3. powerwindows83

    [HELP] Open vs Locked Differential

    as someone who really only makes prototype off roaders, i can tell you you want diffs in as many spots as you can fit them, and as many of them lockable as you can reasonably manage. if you need to delete them for design reasons, take the center out first, then the rear, then the front. suspension: easy rule of thumb: the more flex you have, the more diffs you want. the less flex you have, the more diffs youre gonna need to remove. a suspensionless chassis should have no diffs, while an unsprung pendular setup should have all of them. center diff: make a simple 4wd chassis with 3 diffs (locking center) and drive in a wide circle on carpet. note the motor smoothness and speed. then engage the locker and listen to the motor immediately start having to work. on top of that, notice how the circle starts getting much wider... very different handling characteristics, and thats just with the one diff removed. if your steering angle is down in the CV joint range then honestly dont bother with the center diff, but if you plan on significant steering angles on high grip surfaces then you definitely need one. also more diffs = happier U joints :) front/rear diffs: the axle diffs are quite a bit harder to make lockable, but it can be done and there are many designs on here that can be used or drawn from. the easiest and cheesiest method is using pneumatics. a slightly harder but more reliable way is to use a telescoping U joint setup to send drive from the locking motor in the chassis to the mechanism on the axle (assuming live axle setup. its much easier on an independent setup if width isnt a huge issue since the whole drivetrain is fixed). lastly, if space allows just stick the locking motor and mechanism directly on the axle. piece o cake! LSD options: i usually dont like using friction to do things with lego since its unreliable. but if you put all of your reduction between the center diff and the front/rear ones, the friction from the spider gears in the center diff is multiplied and can have a slight limited slip effect between the axles. this can also be noticed if theres enough reduction from portal axles, since they multiply the friction force from the axle diff gears. and if you desire all the LSD-ness, put a clutch and a regular 24t gear tied together across the outputs of a diff. youll be pretty hard pressed to get that stuck... extra info on diffs: when using the old 4L diff under load, always always always put something solid around the case to hold it together, like a thick key ring or something. the sides bow outwards really easily when torqued hard and will cause the spider gears inside it to skip. i find this diff type to be so irritating because of that ive pretty much stopped using them altogether in high torque applications. when using the new 3L diff always always always put a second 20t gear on the opposite side of the 5x7 case from the driving one. under very high loads the ring gear will slightly bend away from the 20t and cause it to skip. putting the second 20t on the other side eliminates this effect entirely so far as ive tested it. for exactly this reason, never use 92910 as a diff carrier if the model will see high torque since you cant put a secondary gear on it, and the force required to cause the diff/20t skip is enough to demolish the gears after just one skip. sorry for the wall of text :P
  4. powerwindows83

    MOC (RC) Hummer H1 Humvee

    ummm why not? nice build! how did you get the drive to the wheels with that small a center section?
  5. powerwindows83

    Articulated truck question

    you could make the motor easily removable from the rear section and the wire from its connector, then just pop the motor into the next rear section and thread the wire back through possibly? also try messing around with half beam triangles and the U bracket (4558692 this thing...) with pins connecting them. with fairly little effort you can make a steering system with a u joint, and steering system thats only a little bit floppy (i care a lot about steering flop and i consider this design passing). the ground clearance under the design im referring to is pretty much the most you can possibly achieve, with just over one stud below the center being the lowest point. im at work thus not near LDD so i cant draw it for you, but the only issue i can imagine you might run into will be the overall height. but hey! engineering! :D
  6. a little off topic, but it would be nice if TLG made air springs (airbags) like trucks have. just a short-throw high-volume flexible rubber accordion with a port on it
  7. brilliant idea using the treads for the seats man! also hows the overall strength of the suspension? it looks like there are a lot of build techniques used that will separate after a small amount of use
  8. powerwindows83

    [HELP 8366 Steering Issue

    do this at your own risk, but if you pour out a little tub of rubbing alcohol and just dunk the thing (no power sources in it obviously) it will clean out anything thats sitting where it shouldnt. swish it around a little to make sure its thoroughly rinsed out. alcohol evaporates and doesnt leave anything behind so no worries there. you might want to do a quick once-over and make sure theres grease/oil where there should be afterwards, but that should do the trick if the problem is actually on the vehicle side of it :)
  9. powerwindows83

    [MOC] Motorised 4x4 Pick-Up

    theres gotta be some amount of separating/binding in the driveshafts with that kind of geometry mismatch, right? also how are you avoiding axle wrap? i only see two links per axle.. nice job on the bodywork! :D
  10. powerwindows83

    Adjustable tank suspension (Strv 103)

    i cringe when they twist, but then i remember they go through heck every time i use them in a drivetrain so i suddenly stop caring so much about their wellbeing... also theyre pretty inexpensive here in the us so if i do deform or break a few i can just buy more
  11. powerwindows83

    MOC [WIP] CH-53E Super stallion

    its time for me to flyyyyy :D does it have functions or is it purely aesthetic? even if no part of it moves thats still quite impressive :o edit: im at work so the video doesnt work :P
  12. powerwindows83

    Lego Gear Mesh Calculator

    ah yes, sariel is gonna have to update his calculator now :)
  13. powerwindows83

    Pneumatic Switch

    that makes sense. the real question is why didnt they make the slider a normal lego connection of some sort... blown opportunity imo :P
  14. powerwindows83

    Driving newer turntable with worm gear

    im with whoever said just using the right gear with a turntable is probably the best idea :P
  15. ive ordered a good many of these wires, and honestly i would give up on the original wiring entirely. very time the casing starts to go i just cut the wires flush with the 2x2 case and then solder new ones directly to the studs on top. you lose some or all stackability of the connectors but thats not really a big deal considering pf extension wires can do that job perfectly fine. lego needs to remanufacture them for a while just for the great number of us who still have old technic electrical systems and railroad components... i know this sounds like a somewhat defeatist answer but if it happened once itll happen again. and if youre gonna be marking up the 2x2s anyway to get into them, soldering to the studs isnt really all that scary. just dont leave the iron on them forever of course :P