[WIP] Tractor

[Mechbuilds]

I'm gonna build a tractor. 

Yeah. Woo. 

It's going to be pretty large. I ordered big tires with those 3 stud wheel bearings. 
I'm thinking about what functions to add and how to implement them. 
Basically, i'm going to add a piece that you can attach stuff in the rear like a normal tractor. And add a drive shaft that you can connect another driveshaft into. 
Since the scale is going to be larger, i'm probably going to put the battery box under the hood and power everything with a large motor.. 

What i'm currently going with is:
Big motor and geared down so it's very slow but torquey. 
Steering will be operated by twisting a knob. Maybe on the roof disguised as a work light. 


Should i keep the tractor itself only having two functions? (Manual steering and electric rear wheel drive) and just add the rear axle piece so i can attach a custom tool to the tractor? 
What i'm thinking about is having a big log saw mill that's powered by the tractor accessory drive shaft. 

[Mechbuilds]

WIP pictures:






The hood is halfway done and it'll stay open!

[Imanol BB]

Looks like a very promising project, i like the scale; considering its size, you could try to make it manually steered and driven, and keep the PTO and other functions motorized, and see which kind of tractor would be the best option, decide which would be the best combinations, articulated or with steered wheels, equally sized tires or the rear ones bigger, tracked or wheeled, to have rear PTO, front PTO or both, this may also have some effect in the final model, so far it looks good, i am looking forward for more updates.

[1gor]

First of all tell us which (real) tractor is your inspiratiom?

[Mechbuilds]

23 minutes ago, I_Igor said:

First of all tell us which (real) tractor is your inspiratiom?

I actually don't have a tractor for inspiration. I'm making this completely on the go. Let's see what wacky thing i come up with. 
We could pretend it's a futuristic tractor

31 minutes ago, Imanol BB said:

Looks like a very promising project, i like the scale; considering its size, you could try to make it manually steered and driven, and keep the PTO and other functions motorized, and see which kind of tractor would be the best option, decide which would be the best combinations, articulated or with steered wheels, equally sized tires or the rear ones bigger, tracked or wheeled, to have rear PTO, front PTO or both, this may also have some effect in the final model, so far it looks good, i am looking forward for more updates.

That's a nice idea. I'd like to think that the tractor has attachment points at least on the rear that you could attach pretty much anything that you can attach to a tractor and make it run by it. 
Well i did order bigger rear tires than the front but both are at the scale where you need those 3 pin bearings. 

The front will be steering and i'll add a steering rack that'll be operated trough the tractor cab. It'll either be the steeringwheel itself or a work light on the roof that you manually twist to turn it.. 
I'll probably add the accessory shaft behind the rear tires and have a switch that'll either move the tractor forwards or spin the accessory shaft.. I might add an additional shaft to the front. 

My biggest problem here is that i only have one set which was the bucket wheel excavator. But i've been ordering specific parts from brickowl and i'm slowly building a chassis. 
The hood was the easiest part to build though. It has a very slim appearance and it covers the battery box nicely. I might modify the grille a little bit and add more lights to it though.. 
I haven't decided how to do the exhaust yet. And to be honest, i don't have the right parts to even build an exhaust for this. 

I'll just keep building till i need more parts. 

[BrickbyBrickTechnic]

I assume this is gonna be pretty big! The hood is reminiscent of the 42054's.

[Jurss]

Maybe put battery as a gasoline tank in the back (some older tractors had them in back), and put fake engine under the hood.

[Mechbuilds]

30 minutes ago, Jurss said:

Maybe put battery as a gasoline tank in the back (some older tractors had them in back), and put fake engine under the hood.

Nah, the BB makes a convincing modern engine.. Maybe we could pretend that it's an electric tractor of the future. 

8 hours ago, BrickbyBrickTechnic said:

I assume this is gonna be pretty big! The hood is reminiscent of the 42054's.

Yeah the hood is inspired from it but not completely 100% copied. 
The hood needs to fit between the wheel arches.  

It's not going to be a very high quality moc but it'll be a good big project. 
I'm working with what i have. 

[1gor]

13 hours ago, Mechbuilds said:

I actually don't have a tractor for inspiration. I'm making this completely on the go. Let's see what wacky thing i come up with. 
We could pretend it's a futuristic tractor

Then I give you an idea for this futuristic tractor 

At least I'm planing to make it in future

[Mechbuilds]

Here's an update!



Here we can see the hood a little bit modified, the seat which is still a work in progress... The rear differential coming together. And the front steering mechanism starting to build out.. 
Still waiting for parts in the mail. 

Here's a rough "slap them together" of what it'll start to look like:

Edited October 26, 2017 by Mechbuilds

[1gor]

Good idea to use 24 tooth gear at the rear 

[Mechbuilds]

What i want now is: Select from driving wheels or driving external shaft.. 
Problem is: If i squeeze the motor right under the BB construction, i'll only have enough room to just directly attach it to the wheels.. I could just put an external shaft attached to the differential but then my wheels would be turning at the same time. 

If anybody can give me a tip here, it'd be great. 

Front wheels and tires:
41896 + 45982
Rear wheels and tires:
44772 + 54120


EDIT:
I can also extend the chassis a little bit to fit the construction. 
The rear axle should be 1 stud higher than the front due to the difference of size on the tyres. If i put them at the same height, the front will be lower than the rear. 

Edited October 26, 2017 by Mechbuilds

[Mechbuilds]

Update!

Bottom half of the frame midway complete. Try not to cringe at the amateur job of the gearbox.. It's not completely finished but the motor drives the rear wheels.. I think the ratio is 1:2,5 or 1:3.. Haven't done the calculations yet.
The frame is already a tad too long to my taste but i can make it work. The part that makes me sad is that i couldn't figure out how to make a functional tractor front suspension.. (The front axle hangs from the middle with no springs) <-- The steering might be harder to built. 
So it's currently a suspensionless tractor.. But hey.. The seat has a suspension so it's all good right? 

Here are some pics:




Yeah... The gearbox is pretty cringy i know.. 
Any pointers how to attach the selector to the side? 

[Mechbuilds]

Update! 

It's starting to take shape. I'm still kinda fiddly with the gearbox and the hood situation but it's coming together..
I just hope that the rear tires are one stud higher because otherwise we'll have a tractor that has the front end slightly lower and the rear end higher.. 

Pics: