[TC22] Backhoe grader - inspired by Hydrema 614

[jorgeopesi]

I have no words for this huge tiny machine...

[MP LEGO Technic creations]

  On 5/12/2022 at 5:35 PM, 1gor said:

Impressive amount of features in such small package

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Thank you!

  On 5/12/2022 at 7:17 PM, jorgeopesi said:

I have no words for this huge tiny machine...

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You're too kind!

[2GodBDGlory]

Yeah, this thing is sweet! Massive functionality, and good looks. I do think it looked a bit more refined before you added the rotating cab, with the pneumatic outriggers, but I think this unique function is worth it. If possible, I'd like to see the outriggers appearance change a bit, though. The arm itself on them looks a little too simple, so if you could add a foot or something, I think it would look better.

[Magical Duck]

This is simply incredible, well done!

[MangaNOID]

Jesus! besides lack of time this is why I wont enter TC22  This thing Looks incredible. Hope to see a video?

[MP LEGO Technic creations]

  On 5/12/2022 at 8:41 PM, 2GodBDGlory said:

If possible, I'd like to see the outriggers appearance change a bit, though. The arm itself on them looks a little too simple, so if you could add a foot or something, I think it would look better.

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I'm aware of this issue and admit I've also made better ones. But a problem is still there - the outriggers have to be able to fully retract when the cabin is rotated by 180° to fit in the box and any kind of legs at the end of the arm would stick out. However, as I'm not satisfied with that either, I'll have a look at it once more this weekend .

Edited May 13, 2022 by MP LEGO Technic creations

[Thirdwigg]

Thanks for the update. I like the outriggers myself, but I confess I am more team linear actuators than team pneumatic, so know that.....

I miss the black details on the cabin. I really liked cabin that was in the first draft as it looked very clean. I do like the rotating cab design that you added though, and integrating all the pneumatic functions to the cab turned our really well.

Keep it up.

[MP LEGO Technic creations]

Some other imrovements have been made, now the model is more or less completed.

The final dimensions are 33 (L) x 14 (W) x 21,5 (H) when fully folded.

I've redone the outriggers, which now have a rubber support for better traction on each side, added mirrors and taillights, made the interior and improved some other things.

The rear arm now uses two thick pneumatic cylinders as the thin one was completely weak and useless when actually digging.

The studded parts for the front arm were added for better looks and as a counterweight of the rear arm.

I'm quite satisfied how implementing all the pneumatic parts turned out.

 

 

 

 

 

 

 

 

 

 

 

Edited May 21, 2022 by MP LEGO Technic creations

[1gor]

Wow that should be official Lego set.

[2GodBDGlory]

Amazing MOC! Those outriggers look much more substantial.

[MP LEGO Technic creations]

  On 5/21/2022 at 4:40 PM, 1gor said:

Wow that should be official Lego set.

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Thanx!

 

  On 5/21/2022 at 5:48 PM, 2GodBDGlory said:

Amazing MOC! Those outriggers look much more substantial.

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Thank you, I agree with you that the outriggers are much better now.

 

Here's a quick overview of mechanical functions (rotating rear bucket excluded), there would have been a 56z turntable connected to 8z red gear, however it wouldn't be easy to see anything through it then.

The blue part is for the outriggers - connected to a small LAs.

Unfortunately, I'm not brave enough to try making a 3D model of all those pneumatic components and hoses... 

Edited May 23, 2022 by MP LEGO Technic creations

[GerritvdG]

This is really well done, congratulations on this outstanding MOC!

[2GodBDGlory]

I love your geartrain for the outriggers! You're using two unusual gears in there with the 14T (A personal favorite part of mine) and the 20T idler to make a very clever, compact mechanism.

[Magical Duck]

  On 5/21/2022 at 6:05 PM, MP LEGO Technic creations said:

Unfortunately, I'm not brave enough to try making a 3D model of all those pneumatic components and hoses... 

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If it's okay with you, I've already made some progress towards a 3d model using the pictures. I'm not the greatest at working with Stud.io, but I'll see how far I can make it! And once again, you have made a fantastic little backhoe.

[MP LEGO Technic creations]

  On 5/21/2022 at 7:20 PM, GerritvdG said:

This is really well done, congratulations on this outstanding MOC!

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I'm glad you like it!

 

  On 5/21/2022 at 8:40 PM, 2GodBDGlory said:

I love your geartrain for the outriggers! You're using two unusual gears in there with the 14T (A personal favorite part of mine) and the 20T idler to make a very clever, compact mechanism.

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Thank you. This took me some time to achieve as I didn't have any of those 14z gears before and had tried solving it again and again with standard, recently used ones. However, I like this very much (and there's no more space left for any other solution anyway).

 

  On 5/21/2022 at 10:46 PM, Magical Duck said:

And once again, you have made a fantastic little backhoe.

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Thank you very much!

  On 5/21/2022 at 10:46 PM, Magical Duck said:

If it's okay with you, I've already made some progress towards a 3d model using the pictures. I'm not the greatest at working with Stud.io, but I'll see how far I can make it!

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I'm perfectly fine with it. Eurobricks is for fun, sharing anyone's ideas and inspiring each other. Feel free to do everything you want with it 

In fact, I've also started making Stud.io model of it, here's what I've already done - all hoses and cabin are missing.

Special thanks to @Philo for adjustable LAs and pneumatic parts' files for Stud.io.

 

Edited May 22, 2022 by MP LEGO Technic creations

[Akassin]

  On 5/22/2022 at 7:37 PM, MP LEGO Technic creations said:

Special thanks to @Philo for adjustable LAs and pneumatic parts' files for Stud.io.

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Could you share a file with adjustable LA and pneumatic elements? I will be very grateful

[MP LEGO Technic creations]

  On 5/22/2022 at 10:15 PM, Akassin said:

Could you share a file with adjustable LA and pneumatic elements? I will be very grateful

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Those and many more can be found at @Philo's website: https://www.philohome.com/studio/packs.htm

 

Edited May 23, 2022 by MP LEGO Technic creations

[Thirdwigg]

It looks great! And I take back my comment about the black cabin details; the Dark Blush Grey looks great, and highlights the Yellow a little better.

It's crazy how all this fits in the box when the tractor contorts itself in that funny way. Great job!

[MP LEGO Technic creations]

  On 5/23/2022 at 6:08 PM, Thirdwigg said:

It looks great!

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Thanks!

  On 5/23/2022 at 6:08 PM, Thirdwigg said:

And I take back my comment about the black cabin details; the Dark Blush Grey looks great, and highlights the Yellow a little better.

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That was my intention - I'm happy you've made the same conclusion. I admit I also like the yellow-black clolour combination but that didn't look good enough for me at this model.

  On 5/23/2022 at 6:08 PM, Thirdwigg said:

It's crazy how all this fits in the box when the tractor contorts itself in that funny way. Great job!

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In fact, it's absolutely necessary to use all 10 functions to get into this pose (and took me some time to achieve the most effective and smallest one).

I hope I'll manage to make a video presentation on time.

[MP LEGO Technic creations]

As the model is finished, here's a demonstration video (I know it's not the best one but I hope it'll be enough):

Thank you for watching and any advice given during the building process.

[SaperPL]

The model looks beautiful - perfectly detailed, strong contender for the first place IMO. What is missing in this model is that it should be possible to turn the chair towards the back, even if only it would be made by shifting position of the backrest of it.

I like the trick with driving both linear actuators on the supports with one knob although for me this way of using the half stud gears is not perfectly clean when they are on the same level in a grid. Still a really cool use of that technique.

By the way - since you're not rotating the seat - why not route the HOG knob to the roof through the turntable? I don't like the idea of HOG knob being under the excavator arm.

 

Edited May 29, 2022 by SaperPL

[MP LEGO Technic creations]

  On 5/29/2022 at 1:25 PM, SaperPL said:

The model looks beautiful - perfectly detailed, strong contender for the first place IMO

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I'm pleased!

 

  On 5/29/2022 at 1:25 PM, SaperPL said:

What is missing in this model is that it should be possible to turn the chair towards the back, even if only it would be made by shifting position of the backrest of it.

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You're right but I didn't find any way how to make it possible, because the seat's backside is directly touching the triangular structure which secures the rear arm. Even if it was possible to rotate the seat backwards, there wouldn't be any space for the "drivers legs". In fact, I went through official backhoes sets and found none with this basic, yet necessary function.

However, I agree with you that it doesn't well (and is one of the worst things about this models, IMO).

  On 5/29/2022 at 1:25 PM, SaperPL said:

I like the trick with driving both linear actuators on the supports with one knob although for me this way of using the half stud gears is not perfectly clean when they are on the same level in a grid. Still a really cool use of that technique.

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I tried everything that came to my mind before used this gear combination but none of the others was acceptable for me. There doesn't seem to be any kind of stress, though.

 

  On 5/29/2022 at 1:25 PM, SaperPL said:

By the way - since you're not rotating the seat - why not route the HOG knob to the roof through the turntable? I don't like the idea of HOG knob being under the excavator arm.

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Well, yes. It isn't the most practical way to steer the model but I have a few reasons for that:

• There isn't any more space through the turntable - 3 hoses already routed there
• I didn't like an axle going through the seat (which would make using that panel impossible)
• The model's qiute rear-end-heavy, so when reversing, this solution would allow the front wheels to lose contact with the ground very easily

I hope I've answered all of your questions, if I overlooked something, please let me know. 

Edited May 29, 2022 by MP LEGO Technic creations

[SaperPL]

  On 5/29/2022 at 3:19 PM, MP LEGO Technic creations said:

• There isn't any more space through the turntable - 3 hoses already routed there

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Ah yes, silly me. I totally missed that part.

  On 5/29/2022 at 3:19 PM, MP LEGO Technic creations said:

•  I didn't like an axle going through the seat (which would make using that panel impossible)

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I've had builds where I did move the steering axle away from the centre of the turntable. But still managing the hoses around it would be cumbersome so it's understandable to not go that route at this scale.

Anyway, once again - great model and it seems like the competition will be really strong this time around where there's a lot of almost perfect models with just small shortcomings that you could pick on, and it'll be a hard decision with voting. Good luck :)