42167 Mack LR Electric Garbage Truck

[Jundis]

50 minutes ago, R0Sch said:

See the link in my first post. And no, it's not done. Just the bits I could reverse engineer from the images.

Very cool reverse engineering so far! Can you guess, why the rear axle is black (two 4L?), while the middle one is a LBG 9L?

[1gor]

2 hours ago, Jundis said:

Very cool reverse engineering so far! Can you guess, why the rear axle is black (two 4L?), while the middle one is a LBG 9L?

Or perhaps two of those?

[R0Sch]

2 hours ago, 1gor said:

Or perhaps two of those?

No, that wouldn't make sense since black is with friction ridges. I guess it's just two 4L axles held with a 3L axle connector. But that would mean the 3x19 frame would shift towards the front and interfere with the steering. Strange...  In conclusion there is no 3x19 frame included. Just two 13L flip-flop beams. Something like this:

Edited December 4, 2023 by R0Sch

[Outdoors02]

To me this set offers a good balance of price and piece count while having great playability.

[Thirdwigg]

Yeah, I'm liking this set a lot. Thanks for the mocup @R0Sch, this is helpful to better understand the design.

[SNIPE]

6 hours ago, R0Sch said:

In conclusion there is no 3x19 frame included. Just two 13L flip-flop beams. Something like this:

Surley you mean 15L or 11L flip flop beams?

Edited December 5, 2023 by SNIPE

[R0Sch]

38 minutes ago, SNIPE said:

Surley you mean 15L or 11L flip flop beams?

Yes, 15L. Sorry.

[Moz]

That's amazingly quick reverse engineering, well done!

[1gor]

15 hours ago, R0Sch said:

No, that wouldn't make sense since black is with friction ridges. I guess it's just two 4L axles held with a 3L axle connector. But that would mean the 3x19 frame would shift towards the front and interfere with the steering. Strange...  In conclusion there is no 3x19 frame included. Just two 13L flip-flop beams. Something like this:
 

That makes more sense indeed

[SNIPE]

11 hours ago, R0Sch said:

Yes, 15L. Sorry.

I *might* forgive you

[Zerobricks]

18 hours ago, R0Sch said:

No, that wouldn't make sense since black is with friction ridges. I guess it's just two 4L axles held with a 3L axle connector. But that would mean the 3x19 frame would shift towards the front and interfere with the steering. Strange...  In conclusion there is no 3x19 frame included. Just two 13L flip-flop beams. Something like this:
 

I would flip and move the 15 stud flip flop beams one stud forward so that you get a better attachment point. Other than that, good job!

[Timewhatistime]

I really wonder why the designers chose a brown 5L axle with stop (and a half bush in order to shorten the part which sticks out at the bottom end) for the rear half of the grabber... a dbg 4L axle would have done the job, too - without the extra half bush and without the part which sticks out.

 

Does anyone here have an explanation or probable reason for that decision?

[Zerobricks]

15 minutes ago, Timewhatistime said:

I really wonder why the designers chose a brown 5L axle with stop (and a half bush in order to shorten the part which sticks out at the bottom end) for the rear half of the grabber... a dbg 4L axle would have done the job, too - without the extra half bush and without the part which sticks out.

 

Does anyone here have an explanation or probable reason for that decision?

Better clutch power, since the whole axle passes through the part. You have to realize axles are rounded, reducing their effective clutch power + a stop reduces the already low usable length by 0,8 mm. Same reason wheels are almost always attached to "too long" axles.

[R0Sch]

Update on the model since better images were revealed. I even got the part count of 503 right. Probably 97% accurate. 42167.io

[Timewhatistime]

18 hours ago, Zerobricks said:

Better clutch power, since the whole axle passes through the part. You have to realize axles are rounded, reducing their effective clutch power + a stop reduces the already low usable length by 0,8 mm. Same reason wheels are almost always attached to "too long" axles.

Thank you, I never thought about this effect of the rounded axles - but always wondered why there are so many "too long" axles for wheels.

(I'm not sure about the effect of the stop on the length: The stop slides into the pinhole, so there should be no shortening effect;  however, when inserted into an axle hole (i.e. cross), there would be the shortening effect.)

So in the case of the Mack garbage truck, a 5.5L axle with stop would have been a better choice for the front grabber - and besides the better clutch power at the bottom end, the stop would prevent it from sliding down as a whole.

[gyenesvi]

19 hours ago, Zerobricks said:

Better clutch power, since the whole axle passes through the part. You have to realize axles are rounded, reducing their effective clutch power + a stop reduces the already low usable length by 0,8 mm. Same reason wheels are almost always attached to "too long" axles.

I think in this case, the stop part would go into the pinhole of the 2x4 L beam on the top, so there would be no shortening of the axle if a 4L axle with stop would be used. Second, the other arm of the gripper is mounted on a 5L axle without stop, so its bottom end is exactly where a 4L axle would reach. So I don't get either why the asymmetry. If it works on one arm, it should work on the other as well. Or if they made the axle of one arm longer, why no make the other one longer as well using a 5.5 axle?

[Zerobricks]

22 minutes ago, gyenesvi said:

I think in this case, the stop part would go into the pinhole of the 2x4 L beam on the top, so there would be no shortening of the axle if a 4L axle with stop would be used. Second, the other arm of the gripper is mounted on a 5L axle without stop, so its bottom end is exactly where a 4L axle would reach. So I don't get either why the asymmetry. If it works on one arm, it should work on the other as well. Or if they made the axle of one arm longer, why no make the other one longer as well using a 5.5 axle?

Agreed, I'd use a 5,5 axle on the driven side too - it's symmetrical and most fixed solution.

Edited December 6, 2023 by Zerobricks

[SNIPE]

Only thing missing with this model is either:

Small micro scale engine driven by a pair of bevel gears on the rear axle

OR

A compactor  in addition to the tipper to empty the truck.

And since its an "electric" truck , no engine :)

Other than that, its a good model

[R0Sch]

5 hours ago, gyenesvi said:

I think in this case, the stop part would go into the pinhole of the 2x4 L beam on the top, so there would be no shortening of the axle if a 4L axle with stop would be used. Second, the other arm of the gripper is mounted on a 5L axle without stop, so its bottom end is exactly where a 4L axle would reach. So I don't get either why the asymmetry. If it works on one arm, it should work on the other as well. Or if they made the axle of one arm longer, why no make the other one longer as well using a 5.5 axle?

I believe the reason they chose a longer axle only on that side is because the rubber band is pulling considerably more on that side of the assembly and the 2x4 liftarm could wiggle out after a few clamping and turning plays if using only a 4L axle. The other side also has no space to fit a longer axle. 5.5L would almost touch the ground so too long.

The thing that bugs me about this model is a lot of axles sticking out without a half bush to cover it up. Just look at the rear. So ugly.

[Timewhatistime]

On 12/4/2023 at 10:37 PM, R0Sch said:

No, that wouldn't make sense since black is with friction ridges. I guess it's just two 4L axles held with a 3L axle connector. But that would mean the 3x19 frame would shift towards the front and interfere with the steering. Strange...  In conclusion there is no 3x19 frame included. Just two 13L flip-flop beams. Something like this:

Be it 13L liftarms or 15L liftarms... why don't you use "normal" liftarms instead of the still rare flip-flop configuration?

As far as I see in the image, none of the vertical holes is engaged with a pin - so simple liftarms (i.e. no flip-flip) should fit as well.

Edited December 6, 2023 by Timewhatistime

[Lipko]

Do we have a knob gear with 45° axle orientation?

[msk6003]

30 minutes ago, Lipko said:

Do we have a knob gear with 45° axle orientation?

Yes. I can confirm.

[R0Sch]

On 12/6/2023 at 8:49 PM, Timewhatistime said:

Be it 13L liftarms or 15L liftarms... why don't you use "normal" liftarms instead of the still rare flip-flop configuration?

As far as I see in the image, none of the vertical holes is engaged with a pin - so simple liftarms (i.e. no flip-flip) should fit as well.

Yes, I know. That screenshot is old. You can check out the latest model linked here:

 

[Timorzelorzworz]

Again another confusing title for a model. "Electric" let new and inexperienced customer assume that it comes with electric.

[Maaboo the Witch]

32 minutes ago, Timorzelorzworz said:

Again another confusing title for a model. "Electric" let new and inexperienced customer assume that it comes with electric.

It's modelled on an electric vehicle, which basically means "model with no exhaust pipe".