19
votes
Accepted
Why are there many hidden holes in 'Monkie Kid’s Team Van' 80038?
This likely has to do with the cost to manufacture the set. It is logistically simpler, and therefore more cost effective, to add an additional element already present in the set rather than to add a ...
- 39.8k
10
votes
Accepted
Can one connect two technic pins end-to-end?
The canonical way of connecting two pins is using part 62462 "Technic pin connector":
Those are shown in step 89 in the instructions of that MOC.
I know there are rods that can fit inside ...
- 7,764
9
votes
Extend/retract speed of linear actuators
I found Sariels video here helpful:
https://www.youtube.com/watch?v=A23yh-enhyI
Sariel states that all 3 LA's extend and retract at the same speed.
Several sources state that the L linear actuator ...
- 10.9k
9
votes
Accepted
What is this yellow bulldozer set?
That looks like set # 856: Bulldozer
The same set was released in the US with set# 951
- 12.5k
7
votes
Cat D11 bulldozer - should the plough and the frame be connected?
Step 925 indicates there are four attachment points for the plow. I'd suggest checking your model against this, making sure each point lines up.
- 2,659
6
votes
Accepted
Error correction after building the D11
I made a major rebuild of the D11, opened the gearbox and found this orange little piece in a false position.
After the correction the D11 run fine.
- 111
6
votes
Accepted
What's inside a linear actuator?
There is definitely a worm gear and a clutch inside, as reported by the (now defunct, but luckily archived*) TechnicBricks blog:
The orange part is the input and engages with its serrated surface the ...
- 15.6k
5
votes
In the Ferrari 42143 build at Stage 85 should the yellow assembly be loose?
I haven't assembled this model, so my answer is based on online building instructions.
Here's the picture of Step 85 you have mentioned. I have added numbers (in lime green) just below connection ...
- 22.4k
5
votes
Accepted
Does LEGO make a electronically controlled pneumatic valve bank?
I don't know of any electronically controlled LEGO pneumatics.
However it's not too hard to get the needed functionality. I see two main parts to the equation :
Controlling the pressure in the system
...
- 2,712
4
votes
How much tension can I expect to get out of a LEGO chains before it starts to give way?
TL;DR (or Executive Summary, if you like): Between 620 and 1420 grams of mass (6.2 - 14.2 Newtons of force), depending on the pieces and their age.
Long version
So I decided to give this a shot and ...
- 15.6k
4
votes
What are the largest Technic-compatible tires on the market?
The largest (by diameter) tyre so far is Tire 139mm D. x 37mm Motorcycle Racing Tread
with Tire 132.6mm D. x 27mm Motorcycle Racing Tread Narrow coming next.
Both are included in following sets:
...
- 22.4k
4
votes
Accepted
Mistake with hook holder (steering arm with round socket) on Technic Helicopter 42145
As you can see from building step 66 and 67 the beam is held with a length 7 axle and a blue length 3 pin.
I'm afraid there is no easy way to flip that beam without partially deconstructing the model.
...
- 10.9k
4
votes
Can one connect two technic pins end-to-end?
Putting bars through pins is legal in my opinion, and is done in official Lego sets from time to time. Especially the "flick missile" is used in technic sets to extend pins with one more ...
- 10.9k
4
votes
Is there a Good Replacement M Motor?
If I understand you question correctly, you are currently using the Power Functions M motors such as this one:
I did a quick search on eBay, and most of the listings I see are not genuine LEGO PF M ...
- 39.8k
4
votes
Accepted
Please identify this green pin
I assume you mean this pin:
https://www.bricklink.com/v2/catalog/catalogitem.page?P=65826
Which was first introduced in the Spike Essential set, but is currently also present in a couple of other ...
- 10.9k
4
votes
Accepted
What is this part? Grey, 3 studs long, with two pins and an axle hole
That's part 4261, Technic steering arm.
It's a relatively old part (last produced in 2005 AFAICS), and it was used as part of the wheel steering mechanism in Technic vehicles.
The idea is to use two ...
- 7,764
4
votes
Size of packaging of Battery Box 88015
The packaging's dimensions are just slightly bigger than the battery box in it (it fits with little headroom, and room for a booklet). Specifically, 8 x 7.5 x 4.5 cm (ref. 88015-1 (Original Box Entry))...
- 2,712
3
votes
Correct axle rotation of partially built LEGO Cat D11 Bulldozer (42131)?
I don't have this set, so my answer is based on online instructions for this particular set.
TLDR: Brown axles are supposed to spin in opposite directions. Long answer below.
Step 105 has two sub-...
- 22.4k
3
votes
How can I build a Lego slope of a rough 50 degree angle with preferably legal building techniques?
You can always invert your "escalator piece" to use as a base as it will make exactly same angle. Then it is up to you how you want your guiding rail to be attached. Here's one idea:
Please ...
- 22.4k
3
votes
Lego D11 ripper cylinder
You can adjust the length (extension) of linear actuators manually in two ways:
The same motor would do - by rotating the axle on its end.
By rotating an extending shaft. Just make sure the other end ...
- 22.4k
3
votes
Is it possible to re-flash the LEGO Spike Prime Hub with Mindstorms Robot Inventor Hub Firmware while retaining all functionality? And if so, how?
There is no problem with switching between SPIKE Legacy and Mindstorms RI firmware.
But ...
Do not upgrade your firmware with the SPIKE 3 App.
After you will not be able to use your hub with SPIKE 2 (...
- 31
3
votes
Alternative to LEGO Education for Technic parts?
I'm not sure what your use-case is here, but LEGO Education is probably the most expensive way to simply buy parts. When you purchase from LEGO Education, you are also paying for access to a bundled ...
- 39.8k
3
votes
Does LEGO make a electronically controlled pneumatic valve bank?
There were a few sets with pneumatics and compressors available from the early '90's, my sister had the 8868 Air Tech Claw Rig which came with a 9V motor to keep the compressor working to provide the ...
- 19.5k
2
votes
Volvo Articulated Hauler (42114) doesn't operate the bucket
A video showing the dumper drive running forward (up) and backward (down) can be seen here. I didn't make the video but it helped me correct the problems I was having with my build. https://bricksafe....
- 21
2
votes
How to make a regular pentagon from technic bricks
Recently came across this problem again, so I'd like to post another answer (2 answers actually).
I figured out how to create an "exact" pentagram (no approximations) using only swivel ...
- 10.9k
2
votes
Accepted
Searching for a part like 48989 but without the pins
I have found the part on several marketplaces on aliexpress and bought it. I don't know if its from Cada or other clone company, but the parts are working fine.
- 191
2
votes
Cat D11 LEGO set won't start the calibration process
Most likely a mistake in step 87.
The two most common malfunctions are
clicking gears and no motion for the shovel, ladder and plow but tracks are working: redo step 87 meticulously.
Wrong engine ...
- 21
2
votes
How can I build a Lego slope of a rough 50 degree angle with preferably legal building techniques?
The bar elements in your step part are vertically separated 3 plates and horizontally 1 module which is 2.5 plates. So the exact angle (rather than approximately measured) is atan (3/2.5) = 50.1944289 ...
- 10.9k
2
votes
Lego 88012 hub socket type
Here's a photo of the hub:
It includes four Powered Up ports. These are compatible with peripherals (motors, sensors, lights, etc) from the lines branded as Powered Up, Control+, Boost, Robot ...
- 39.8k
2
votes
Are there any flat plates with beveled or sharp edges?
The thinnest curved lip I can think of is Panel Curved 2 x 1 x 1 :
You'd still have to accommodate for the axle hole, but there appears to be room for that in your design (possibly just held by ...
- 2,712
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