DizzelHondo

https://www.bricklink.com/v2/catalog/catalogitem.page?P=18939c01&name=Technic, Turntable Large Type 3 Base with Black Technic Turntable Large Type 3 Top, 60 Tooth (18939 / 18938)&category=[Technic]#T=C Is this the lego turntable your referring to or the one your superstructure is built with? I have built the crane with your superstructure using the directions in gmk topic. I wonder how change I’d have to make using the 60t turntable. can you please provide me a link to your turntable supports?

I ordered the xl actuator for my grove 6400 crane with efferman boom. I’m excited to try it out. @efferman do you have a turntable for this? I suppose the whole superstructure will have to be rebuilt. The large boom puts so much stress on that little turntable.

I have a close friend that is CNC machinist and has a 3D printer. Would you be willing to send me your design? - I would pay you for it.

https://share.icloud.com/photos/0ac7P5e2GMsEJEIeXoUYjrhKQ I have started on the gmk6400 with no suspension. It’s becoming quite a beast! Building the @effermansuperstructure and going to use his xl actuator. Would it be possible to make it out of aluminum?

I did some research on both the sbrick and buwizz. I own the buwizz as it’s far better in my opinion. Huge limitation with the stock battery pack as there is current limiting built in from LEGO. So even if you sbrick it for ir you will get slightly improved performance you are still limited on the LEGO battery. The buwizz is all in one both ir and a battery. I power 5 motors with it and the app works great. The performance is impressive. If you are using a single xl motor you find the limitation of it pretty quick from this model.

That is going to make it a little more difficult to try and and finish but I'll give it a go and report back with pictures if I do. Thanks Jim.

Hey Guys, Building this now and was wondering if anyone including Jim has any updates to this. Tested with two motors by taking the engine out of installing in front. Huge difference in off-road power. Just started to rebuild the whole chassis like Jim did. It's going to be a little difficult because some parts are hard to see what is going on inside the chassis with the gears. Anyone got added pictures? Thanks.