THIS IS THE TEST SITE OF EUROBRICKS!
Search the Community
Showing results for tags 'bracing'.
Found 4 results
-
One for the structural engineers out there... I am building a structure to support my latest GBC module. I have vertical supports, and a horizontal cross-member. I am using a 12-long brick to form a 6-8-10 triangle to maintain the right angle between the support and the cross-member (thank you Pythagoras!). But which is the best way to do it? In the red version (on the left), the 6 side is horizontal, and the 8 side is vertical. In the blue version, it's the other way around. Which one should I use? Or are they equivalent? Under which circumstances should I use one over the other? In this case, the brace will be under compression (holdling something up). Would the answer be any different if it was under tension (holding something down)? Thanks Owen. P.S. The forces involved are not great, so I'm certain that either one would suffice. I'm just curious about whether one is better than the other. I'd settle for which one is more asthetically pleasing. -
Hi all, i have moded the Mobile crane 8421 so the slewing is now driven by gears. On the one hand it works actually ok but on the other hand i discover that the upperstructure of such a big crane is quite heavy so this slewing drivetrain is obviously under stress. I have tried to keep it simple and i have also tried to brace all axles and gears as good as possible (e.g. the grey axle above the worm gear is only for bracing/bearing the 8 teeth gear at the right end (otherwise also a axlepin without friction could be used but i thought this could be weak).... but i'm not a pro... so the question / plea is: Could you please take a look at the following picture which shows all this stuff: The red line shows the drivetrain for slewing; at the worm gear a double beared vertical axle goes to the large technic turntable which drives the upperstructucture via the inner ring. left bottom in the picture you see the zoom for the lower bearing ... left top you see the upperstructure from underneth, how the vertical axle is mounted there and how it is braced. so: Is this drivetrain well braced or with other words: where do you see weak points? In general now i have a suspicion: TLG doesn't drive slewing by gear trains because the upperstructures of their big mobild cranes are simply to heavy so the slewing can not being guaranted save without cracking gears or at least this needs too much effort in construction/design... Am i right, what do you think? The small mobile crane 8431 is an exception because its upperstructure is way lighter than 8421 or 42009.... Thanks a lot! -
I just had a "Eureka" moment. I have recently been spending a fair bit of time re-designing the power transmissions for some of my GBC modules. I made sure that everything was properly braced, all the axles were supported in at least two places, etc. I also took the opportunity to include one of the torque-limiting clutch gears, in case something goes wrong and the mechanism binds. My realisation was that if I'm going to put in the clutch gear, I don't need to go overboard re-inforcing the structure - I only need it to be strong enough to withstand the amount of torque that the clutch gear can provide, rather than being able to withstand the torque of the driving motor. The clutch gear will slip before the bricks come apart. I guess my point is that bracing and structural soundness is all well and good, but it is certainly possible to make it far sturdier than you need. Owen.
-
In my car MOC, I braced both sides of most of the driven axles so when moving the axles won't wiggle out of the beams from the torque. In the example pictures below, I was wondering if the first picture, with the brown 3L with stop is good enough for use, or if I should always place a beam in front of it to prevent the 3L from pulling itself out (as shown in the second picture). Do I need to always prevent axles from pulling themselves out or is it fine without doing so? Any thoughts would be appreciated.
