[MOC REVIEW] Grove GMK6400 Mobile Crane

[Dafgek81]

This is one insane crane.

What TLG sets have a high percentage off useful parts for this monster besides 42009

[kisper]

Sorry how do I get a part list it and also which sets to build this beast ?

Edited December 4, 2015 by kisper

[Dafgek81]

Or do one have to buy multiple sets of 42009

[Karle]

I've built the Grove using one 42009 kit and ordering the rest of the parts from Lego and Brick Link. There was a parts list for the first version that was "mostly" accurate. I found it on Brick Shelf, unfortunately, I'm not sure of the link. The hard copy has \Grove GMK6400 New.bsx printed on it. The prim mover of version 1 is a little under powered, the steering's a little vague, and there is a tendency to leave gears and 2.5 axels in its wake. The MK II is now being rebuilt into a MK III. Good luck with your build.

Edited August 31, 2016 by Karle

[xsysiek]

I've built too GMK. I used 3 sbricks to control it:

1. Carrier movements

2. Carrier lights

3. Superstructure

Carrier version is MK II (no suspension). I used my own 3D print parts instead of part #6571. It works very fine except gear for fake engine is too high. I change "24t->8t" to "20t->12t". There was so much torque that liftarm holding axle with 20t and 24t moved from side to side. Otherwise there were crunchy noises.

Superstructure was built in version 3 (firgelli actuators). Although it looks fine, it movement are not. It wobbles when rotating also go up and down when moving boom. Also boom angle is not realistic enough (around 65 deg, when it should be 80 deg). Compared to designer han Dragline Excavator, which is solid as steel, it behaves like giant jelly. I will try to rebuild superstructure to something similar to version 4, but with firgelli and added stability. I will also use 6 panel boom.

[Mitchster]

I recently got back into Technic and built the 42009 a couple months ago. Since then I have rebuilt it following the Ultimate 42009 plans and am now building the Extended boom. I've spent even more time reading these forums and studying these incredible MOCs. I want to build the Grove 'draft4' soon, but I am pacing myself to learn what all is going on here. One question, has anyone tried making the boom in 4 sections instead of 3? It would be wider of course, but is there some technical restriction?

Thanks!

[Karle]

I don't believe so. With all sections extended, the model is on the edge of stability and disaster as it is.

Edited December 13, 2015 by Karle

[Siyba]

Hello,

I'm new on this site because I want to relive a childhood hobbie. I was impressed with the standard 42009 I saw and decided to buy one. But before I started the build I stumbled upon this forum and I am blown away by the Grove GMK6400 conversion. I already downloaded several plans and decided to build the MK3 chassis with the superstructure with the actuators and extended boom. Everything is clear to me except one thing. Why did you choose for 2 smaller firgelli actuators? Isn't it easier to choose the L16-140-150-12 ?

http://www.active-ro...16-140-150-12-s

It has a bigger stroke, has almost twice the power of the smaller actuators combined and cost less than 2 and I think 1 actuator looks better. I don't think it's very hard to make a custom bracket to fit it in the lego structure. Or is there something I miss?

regards

Siyba

[AFOLegofan66]

Hi Siyba think you need to read this entire post to get all the info!!

[Scapuc]

Finally done!

After few months to have all parts I started to build this moc and this is one of the best moc I have ever built.

Amazing, big, full remote control...I really enjoy to build it with my son.

I've made few errors while I was building it, but it's a part of the game

Thanks to all works for this and for realize instructions (FREE), I'm your fan!

[daJones89]

Hello guys,

I'm new in this forum and my intention is to build the Grove GMK6400.

My question is: Where can I find the finally instruction for this model inclusive the part lists?

[AFOLegofan66]

I finally finished this terrific model and it works perfectly. Thanks again for the plans. As mentioned above this MOC is a bit wobbly because of the weight. Otherwise it works great. The crab steering is awesome on such a large model!!

[flyboy01]

I am looking forward to having enough parts to build that behmoth of a technic model.

[nerdsforprez]

I don't believe so. With all sections extended, the model is on the edge of stability and disaster as it is.

Where exactly is the instability? In the boom (does it bend?) or because the actuators can't hold the boom firm enough? If the weakness is in the boom itself, one could try to add a Y-guy arrangement. Such as this:

Yes, the boom should should hold itself without bending, like a real crane, but because we are working with ABS and not steel special adjustments have to be made. Doing something like this would make a four stage boom possible.

[Kumar]

Hey guys just want to say thank you for all that you have done with the instructions and the variations that everyone has provided. I finally purchased a 42009 mobile crane of my own and I would like to mod it into the Grove GMK6400. I have the instructions for the carrier and lifting structure my question is does anyone have a rebrickable parts list they can provide so that I may know what extra parts I need to purchase to start and complete my build.

Thank you in advance.

[Kumar]

Can someone help me? How do I view the following file... http://www.bricksafe...thout_42009.bsx.

[Jay Psi]

Download Brickstock and use it to open the BSX file, it will show you the (Lego) parts you need to build the Mk3.

[Aleh]

Does anybody have the full partlist? Looks nice to build it.

Edited January 23, 2016 by Aleh

[RickDangerous]

https://www.dropbox.com/s/0muklztzzt43a61/GMK.csv?dl=0

Csv for rebrickable

Someone can explain to me how to move the third section of the Boom? . With the wire comes out together with the second section but comes in only by gravity . It's normal?

Thank's

[Karle]

There is a drawing that shows how to rig the boom sections to retract the third section. Look under Ultimate 42009, the post was by" therealjustin. Sorry! I don't have the post number"

[RickDangerous]

Sorry but I can not find the discussion, someone can be more accurate?

Thank's

[Beard]

Ever since i saw the BWE, I just want to recreate everything with a turntable, by using the new Quarter Circle Turntable. Although that would be out of my league. How many parts needed for a mobile crane? 50 000?

[rcbricks]

amazing crane, very nice job!

[Swwoodburn]

Where can I find plans for this? Thank you

[emielroumen]

I had a go at it last year and I liked building this mammoth. Because of the sheer weight (and the lack of shock absorbers and fitting wheel hubs) I opted for the carrier without suspension. I tried the extended 42009 boom but did not like it and had to obtain quite a few parts via bricklink to finish the extended boom. The counterweight prices were not to my liking and used a bottle of water (1/2 l.) which actually worked quite well. I also replaced the servo steering motors with a heavily geared down M-motor as I did not like the jerky steering. I had to adjust the model as a result, as another axle had to go almost full length to accommodate the single motor steering (instead of 2 servo motors).

Attached are no pictures at this time - I'll add these once they are uploaded to brickshelf.

Edited March 4, 2016 by emielroumen