42157 - Skidder John Deere 948L-II

[R0Sch]

9 minutes ago, TeamThrifty said:

@R0Sch Thanks, i didn't realise there was a different one! I've been away from lego for a few months due to work commitments.. Need to buy some yellow diffs!

If the pivot point is exactly central between the axles then no central diff is needed as the axles always travel the same distance. Same in big articulated tractors. No central diff. Where as the Xerion does due to its steering modes as each axle may be travelling at a different speed, so central is needed

Good to know. Thanks! Well, the pivot point is almost central here. 14M rear and 13M front axle. I guess the gears have enough backslash to compensate that.

[gyenesvi]

1 hour ago, R0Sch said:

It was specifically designed for the Liebherr crane to handle the weight.

That's an interesting proposal, never heard that before. Where do you get that from? It isn't unbelievable, but I guess that would mean that the drivetrain is fundamentally different from that of the Liebherr excavator and the Cat dozer (even though the Cat did have a differential, it did not have to take significant load as it was only for driving the fake engine). So I guess a heavy duty differential would only make sense if the drivetrain would be more sophisticated, for example using an adder mechanism, like in reality. But that would mean that one motor would be used for drive, and one for steering, which would put a lot of stress on that one motor and the drivetrain for such a huge model. So I am curious how that could work out.

[Kenrevo]

The Lego site has different release dates for different countries.  The UK is the first of June and the US is the first of August, I haven't seen Lego do that before.

[kbalage]

12 minutes ago, Kenrevo said:

The Lego site has different release dates for different countries.  The UK is the first of June and the US is the first of August, I haven't seen Lego do that before.

It's not uncommon to have a 1-2 month delay in the US for certain summer releses, Brickset has an article on this. 

[Kenrevo]

18 minutes ago, kbalage said:

It's not uncommon to have a 1-2 month delay in the US for certain summer releses, Brickset has an article on this. 

Thanks kbalage, I haven't bought anything at release recently.  I am excided for the skidder, hope it will be as good as the tow truck. 

[HydroWorld Outlook]

7 hours ago, Maaboo35 said:

This set is releasing in June, so we should be seeing reviews later this month.

Maybe it will be releasing June in other countries, but according to the United States version of the LEGO website, its quite clearly not releasing until August 1, so most of us west of the Prime Meridian still have a few months to go before the set launches. See below attached image.

Edited May 4, 2023 by HydroWorld Outlook

[arijitdas]

54 minutes ago, kbalage said:

It's not uncommon to have a 1-2 month delay in the US for certain summer releses, Brickset has an article on this. 

Sorry to sway a bit off topic. The good part is the folks in US gets the sets but I am in India and we often do not see all the sets. Not sure why Lego India often feel that some sets are not worth releasing in India. Like we haven't got many technic sets like the 42136.

[allanp]

2 hours ago, gyenesvi said:

That's an interesting proposal, never heard that before. Where do you get that from? It isn't unbelievable, but I guess that would mean that the drivetrain is fundamentally different from that of the Liebherr excavator and the Cat dozer (even though the Cat did have a differential, it did not have to take significant load as it was only for driving the fake engine). So I guess a heavy duty differential would only make sense if the drivetrain would be more sophisticated, for example using an adder mechanism, like in reality. But that would mean that one motor would be used for drive, and one for steering, which would put a lot of stress on that one motor and the drivetrain for such a huge model. So I am curious how that could work out.

Does the Liebherr use an adder mechanism in reality though?

I don't think the large modulus gears are needed in the skidder, they only drive the fake engine and the red diff is very strong anyway. But it's nice to be able to get two of them in a cheaper set than the Ferrari and I think the yellow colour fits much better than the red of the other diff.

[R0Sch]

5 hours ago, gyenesvi said:

That's an interesting proposal, never heard that before. Where do you get that from? It isn't unbelievable, but I guess that would mean that the drivetrain is fundamentally different from that of the Liebherr excavator and the Cat dozer (even though the Cat did have a differential, it did not have to take significant load as it was only for driving the fake engine). So I guess a heavy duty differential would only make sense if the drivetrain would be more sophisticated, for example using an adder mechanism, like in reality. But that would mean that one motor would be used for drive, and one for steering, which would put a lot of stress on that one motor and the drivetrain for such a huge model. So I am curious how that could work out.

It's not difficult to conclude that this diff was not needed specifically for the Ferrari nor for the Skidder and since the LR 13000 crane was delayed we got to see it first in the Ferrari. Maybe they want to recreate the 2 engines driving 2 transfer cases in parallel.

Already over 900 parts assembled... I can still finish the cabin, but the rest is almost impossible to guess from the images alone.

[1gor]

@R0Sch usage if panels and frames looks very good (and plausible) on your (virtual) build

[SNIPE]

8 minutes ago, R0Sch said:

It's not difficult to conclude that this diff was not needed specifically for the Ferrari nor for the Skidder and since the LR 13000 crane was delayed we got to see it first in the Ferrari. Maybe they want to recreate the 2 engines driving 2 transfer cases in parallel.

Already over 900 parts assembled... I can still finish the cabin, but the rest is almost impossible to guess from the images alone.

I actually tried reverse enginering a little bit of it last night but since I came across your effort I probaly don't need to bother now :D

Any .io/ldr file once you're done?

It would allow me to start modding it.

[R0Sch]

2 minutes ago, SNIPE said:

Any .io/ldr file once you're done?

It would allow me to start modding it.

Yes, I keep updating the first .io file link I posted in this thread every time I post a picture.

[gyenesvi]

17 hours ago, allanp said:

Does the Liebherr use an adder mechanism in reality though?

That's what I wanted to ask as well. Maybe better in the Liebherr thread.

14 hours ago, R0Sch said:

It's not difficult to conclude that this diff was not needed specifically for the Ferrari nor for the Skidder and since the LR 13000 crane was delayed we got to see it first in the Ferrari. Maybe they want to recreate the 2 engines driving 2 transfer cases in parallel.

Well I agree that it was not needed neither in the Ferrari nor in the skidder, but that does not automatically conclude that it was designed for the Liebherr crane. My guess was that it would be required for a faster RC car, like the upcoming Audi (if that's motorized), because for slower stuff, the red one would work as well.

[Zerobricks]

6 minutes ago, gyenesvi said:

That's what I wanted to ask as well. Maybe better in the Liebherr thread.

Well I agree that it was not needed neither in the Ferrari nor in the skidder, but that does not automatically conclude that it was designed for the Liebherr crane. My guess was that it would be required for a faster RC car, like the upcoming Audi (if that's motorized), because for slower stuff, the red one would work as well.

I agree, Audi would be a better fit too IMO. I see no sense of using adder mechanism for any model, it's very inefficient and unrealistic. Back to topic, I think the model uses a stronger CV joint instead of a U joint inside the articulation point.

[SNIPE]

14 hours ago, R0Sch said:

Yes, I keep updating the first .io file link I posted in this thread every time I post a picture.

Ah I got it.

thx.

[R0Sch]

8 hours ago, Zerobricks said:

 I think the model uses a stronger CV joint instead of a U joint inside the articulation point.

Yep, already changed that 2 days ago. But there are a total of 6 universal joints used for the blade movement alone.

[Jundis]

On 5/4/2023 at 8:54 PM, R0Sch said:

Already over 900 parts assembled... I can still finish the cabin, but the rest is almost impossible to guess from the images alone.

First of: Thanks for the work you put in here!

What I find curious is this pic of the front axle If we zoom in a bit, the hubs aren't held in place by pins but axles?

IMHO this looks like they used the perpendicular connector instead of the 3L liftarm

[TechnicRCRacer]

Does anyone see any green 11L beams in this set? They are super hard to get and I hope they will be remade soon.

[R0Sch]

3 hours ago, TechnicRCRacer said:

Does anyone see any green 11L beams in this set? They are super hard to get and I hope they will be remade soon.

No, it doesn't seem to include 11L green ones.
 

3 hours ago, Jundis said:

First of: Thanks for the work you put in here!

What I find curious is this pic of the front axle If we zoom in a bit, the hubs aren't held in place by pins but axles?

IMHO this looks like they used the perpendicular connector instead of the 3L liftarm

I noticed that too. It's probably more likely the 32184 connector though because it has to connect to the 7x11 frame too.

[zoo]

4 hours ago, TechnicRCRacer said:

Does anyone see any green 11L beams in this set? They are super hard to get and I hope they will be remade soon.

Unfortunately, it looks to me like there aren't many green beams at all included. Apart from panels and frames, there are mostly some smaller parts and 7L flip-flop beams visible. Hard to know for sure before we can take a look at the parts list though.

Edited May 6, 2023 by zoo

[R0Sch]

4 minutes ago, zoo said:

Unfortunately, it looks to me like there aren't many green beams at all included. Apart from panels and frames, there are mostly some smaller parts and 7L flip-flop beams visible. Hard to know for sure before we can take a look at the parts list though.

I disagree. There are a lot of green beams of different length: 3L, 4L thin, 5L, 7L, 9L, 15L, 2x4, 3x5, 1x9 (6-4). There is no 7L flip-flop included.

[Maaboo the Witch]

2 minutes ago, R0Sch said:

There is no 7L flip-flop included.

That surprises me, honestly. I though there'd be at least a couple after Dragon.

Edited May 6, 2023 by Maaboo35

[zoo]

8 minutes ago, R0Sch said:

I disagree. There are a lot of green beams of different length: 3L, 4L thin, 5L, 7L, 9L, 15L, 2x4, 3x5, 1x9 (6-4). There is no 7L flip-flop included.

According to the pictures from your io-file that you've posted earlier there's at least one 7L flip-flop visible or am I seeing things? Anyway, you've probably right about the other parts. Hard to tell from the pictures. It just feels like the beams Xx1 actually included are like 2 of each for the most part. Not very impressive for such a large model if that is the case.

Edited May 6, 2023 by zoo

[R0Sch]

26 minutes ago, zoo said:

According to the pictures from your io-file that you've posted earlier there's at least one 7L flip-flop visible or am I seeing things?

Sorry, you are right. 3x 7L flip-flop in green included.
Here's the front axle fix as @Jundis pointed out, in fact the whole front got extended 1 module to fit the cabin properly.

[1gor]

Now you can make parts list (or inventory) on bricklink