Re: 1/10 Liebherr Excavator R 984 Litronic
 

Thanks for the #number, Ed!

Markus

Re: 1/10 Liebherr Excavator R 984 Litronic
 

Good morning,

today the first boom pictures. I choose the short one for the model. It measures from main bolt mounting to stick bolt mounting 780mm.
It's not only a foursided housing, there is some structure inside to stiffen the whole thing. As you can see, the drum inside is made with two halfs whitch were welded together. The outer diameter is 74mm.

Re: 1/10 Liebherr Excavator R 984 Litronic
 

some more...

it came together very well, all parts got mounting noses and holes like a puzzle again for easier setup. Then the noses were welded at the outside to avoid warpage. Michael did an amazing job on the mill and fabricated the massive steelpart. It will take the two stick cylinders.
The stickside of the boom were doubled up with some lasercut parts and after this I wrapped a belt strap around the sandwiched parts.

Re: 1/10 Liebherr Excavator R 984 Litronic
 

Wow Markus....really like this build !! Great ideas, excellant workmanship and a larger 1/10 scale...looking forward to seeing more..well done!!

What is the size of the bucket??

Re: 1/10 Liebherr Excavator R 984 Litronic
 

thank you guys for your comments. I'm looking forward to show the stick today.

About the bucket, well, it fits to the machine ;-) it is a massive HD Bucket for digging rocks. Sure I'll need some other ones for digging in sod and topsoil, the Rock bucket will be rather ineffective for this. For easy changing there will be a hydraulics operated quick coupler. The bucket needs some more welding, but I ran out of gas for the tig.

greets Markus

Re: 1/10 Liebherr Excavator R 984 Litronic
 

Hi guys,

here some stick work. I made two of them, one fits to Michaels R9100. The lathe bcame more and more useful, here I did the slope on the frontend parts of the stick. It comes together very well, but due to double cylinder action I did a little line boring and reaming on my lathe.

Re: 1/10 Liebherr Excavator R 984 Litronic
 

Here are both together

Re: 1/10 Liebherr Excavator R 984 Litronic
 

And the last ones including the levers and the pushrod. The first picture shows a bushing, it will be loctited in. Markus

Re: 1/10 Liebherr Excavator R 984 Litronic
 

Markus I will have to say it again excellent work. Your getting closer to the dig. Ed

Re: 1/10 Liebherr Excavator R 984 Litronic
 

Thank you, Ed. But I've to go a long way to the end, remember, this project started in September 2011. But I think it's going down the hill!

We come closer to the bucket but first I'll show up with the OilQuick120 quick coupler. Fortunately I was supported from the manufacterer with a drawing and some really good pictures. For this I had to made some really small double-acting cylinders. First tests with compressed air were successful.
Half of the parts were lasercut parts, the others were milled/ premachined by Michael. First I drilled the 1mm holes up to 1.3mm for tapping with 1.6mm (I'm proud to tap 48 holes without breaking that little sucker). Later there will be screwed covers whitch will hold the bolts in place.
The cylinders are simple brass tubes with the head soldered in place. Then I did some internal lathe work for the o-rings on the front and for the lockring on the backside. Really simple made.

Re: 1/10 Liebherr Excavator R 984 Litronic
 

After this a lot of tig-welding and some sandblasting. The last picture shows how the locking bolts locks the bucket.

Re: 1/10 Liebherr Excavator R 984 Litronic
 

That planetary is a thing of beauty. Keep the updates and pictures coming.

Re: 1/10 Liebherr Excavator R 984 Litronic
 

Hi folks,

@Avel: thanks for your comment!

@all: I know you're all waiting for bucket-pictures. Well, here they are, but it´s not finished yet. There´s a little more welding to do, but I think it´s recognizable.
The teeth are sandwich-made using two halfs of lasercut sheetmetal, each 10mm thick. Could be the canines of a grizzly :D The knife is 12mm and needs some milling first (like the teeth).

Re: 1/10 Liebherr Excavator R 984 Litronic
 

and the next ones. The bucket without the knife is for my college Michael, he's got some different teeth (toothcarrier and crown). Anyway, he did a great milling work.

Re: 1/10 Liebherr Excavator R 984 Litronic
 

Here the last ones, just a simply size comparation.
Have fun while watching!

Re: 1/10 Liebherr Excavator R 984 Litronic
 

What a monster this going to be. You have done some great work on the buckets lots of fine detail. Great work. Ed

Re: 1/10 Liebherr Excavator R 984 Litronic
 

It's just incredible that you can fit a gallon jug into the bucket... that model is gonna be just massive! I can't wait to see the pictures of you standing next to the finished model! :cool:

I thought your colleague Michael was building a front shovel? :confused:

Re: 1/10 Liebherr Excavator R 984 Litronic
 

thanks for your comments!

it's even more than a gallon! Today I was a little scared by myself :eek:, I put the stick on the bucket. The phone right next to it is a usual size.

No, Michael builds a backhoe attached R9100. Here two pictures showing the stainless steel laser-sintered toothcrown and the knife. Markus

Re: 1/10 Liebherr Excavator R 984 Litronic
 

Your 1st pic with the stick & bucket, drop that assembly on a scale, let's see what it weighs... then how about a pic with you standing beside it for a size reference? :D

Re: 1/10 Liebherr Excavator R 984 Litronic
 

Wow this thing is going to be massive! Very nice looking build so far:D

Re: 1/10 Liebherr Excavator R 984 Litronic
 

Hi there,

long time nothing new and sorry Joe for don't answering your question earlier. About the weight of this assembly, I didn't use a scale but CAD says round about 15.2Kg :eek:

I wanna continue with the chains, they are already finished several month ago. Each chainlink is made of 14 parts: a right and left side part, a small tube, a second tube used as a roller, the bolt, the shoe, four screws and four selfmade! 4-sided nuts. The side-parts and the shoes did my buddy Michael, I did all the tubes, bolts and nuts on my lathe (200 bolts, 400 tubes and 800 Nuts). Simply check out the pics!

Re: 1/10 Liebherr Excavator R 984 Litronic
 

the small tubes were pressed into the side-parts, receiving the roller-tubes first. Then connected with the bolt through the small tubes, the bolts were loctited into the left side parts. The last bolt is secured with a little worm screw placed under a chain shoe (1.st picture). As a reminder for the invisible chain lock there is a small center boring in the lock bolt.
The shoes were made of steel while the side parts were made out of aircraft aluminum.

Re: 1/10 Liebherr Excavator R 984 Litronic
 

Markus the bucket weighs 33.5 Lbs you are going to need a crane to lift it and move it when it is all finished. Excellent work and a lot of detail it's coming along well. It ought to be able to move some dirt when finished. Ed

Re: 1/10 Liebherr Excavator R 984 Litronic
 

Ed, the bucket is 'just' about 16 pounds, 33.5 pounds includes the stick, cylinder and quickcoupler together. Remember pic no 1 in posting #66. Markus

Re: 1/10 Liebherr Excavator R 984 Litronic
 

Painstaking work on them tracks Markus, but no doubt they work perfectly. :cool:

What tell tale mark did you make to find the connecting link bolt within the tracks to find it easily after entire assembly has long since been completed?

Re: 1/10 Liebherr Excavator R 984 Litronic
 

Joe, this last bolt received a small drill mark with a center drill on the lathe. Just find this one and remove the pad.

first i cut off all cubes (4.5 by 4.5mm) with a parting tool; then I used a homemade chuck for finishing one ofter the other. It took me round about 2 minutes/ average per nut - over 26 hours total! The tubings and bolts were a piece of cake compared to this!

The chain is just thrown over the beams for the picture, the rollers are missing here. With rollers in place the chain got more tension, there is less hanging as you can see here. But it's recognizable.

Re: 1/10 Liebherr Excavator R 984 Litronic
 

The 4th pic, is the tabletop a meter square?

Re: 1/10 Liebherr Excavator R 984 Litronic
 

no, it isn't. The side you see in pic #4 is 80cm. The tracked beam is about ~650mm in length. The table in this picture got a tabletop length of 125cm.

Re: 1/10 Liebherr Excavator R 984 Litronic
 

Wow, this a big project! By big, I mean massive model! Incredible metalworking. Your attention to detail is amazing. The time consuming process of machining the track components alone is crazy. Definitely a labor of love. I'll never complain about having to make duplicate parts of 4 ever again!

Re: 1/10 Liebherr Excavator R 984 Litronic
 

Hi Folks,

it´s hard for me to find some time for working in the excavator-shop, but I did some construction work for the tubings and hoses to find out, what I've to order. All of them are needed for hydraulics except the one on top of the other. This is just for show, originally it's used for the lubrication/ grease line.
Here some results... I hope I can fab those parts. Markus.

Re: 1/10 Liebherr Excavator R 984 Litronic
 

Hi Markus, to comment this work a word is enough.... AMAZING!
I like in particular the project and the construction of the transmission.
My compliments!

Re: 1/10 Liebherr Excavator R 984 Litronic
 

Thanks guys!

here my solution for the hydraulics inside the upper structure. I'll use a 3 section main valve, whitch handles the boom, stick and bucket. Exactly it is a double section valve (stick and bucket) and a single section valve (hoist) in one housing, it has two oilsupports and can be operated with two pumps..
This valve is mounted to the main distribution block, whitch also carries a smaller valve on the right side for operating the quick coupler. This block lowers the amount of hoses and helps cooling the oil. And it gives a clean look.
To support all valves with oil I constructed a pressure relief valve with 3 outputs, each seperated from the other with a check valve. A 4th output is for the pressure gauge.

Re: 1/10 Liebherr Excavator R 984 Litronic
 

here some more; the pump is direct driven and if my math are correct it will deliver round about 2 Liters/min under full load whitch will be set at 35 Bar/ ~500 PSI

Re: 1/10 Liebherr Excavator R 984 Litronic
 

There's no gear reduction in the pump. The Motor has 353KV when taking 10 amps; the revs lowers for each more amp about 4KV.
The hydraulic power output (35 Bar at 2 L/min) is 117W. For the pump I calculated 50% efficiency, so it need round about 235W on the shaft.
Due to the pump size (0.6cm³/rev) there must be a torque of 0.67Nm to reach 35 Bar. Control calculation brings ~3350 revs.

Those pumps are used very often in models, it is small and an industrial one. Markus

Re: 1/10 Liebherr Excavator R 984 Litronic
 

Kevin, I'll use 4s LiFePo, that's about 13V.

The pump itself can take revs up to 8000 (shortly) and 4000revs for a 100% running time (with HLP46 fluid). Feel free to find the data sheet for the IPZ1-HR-10 (0.6cm³/Rev)

If you know the size and efficiency of your pump you can calculate the torque it needs on the shaft:

1.59 (a fixed factor) x 0.6cm³ (amount of oil at exactly one rev) x 35 Bar (difference between input and output pressure) : 50 (efficiency) = Nm (Newtonmeter)

This torque is needed for 35 Bar at any speed! To calculate the input power for the pump you have to go this way:

Revs x Torque : 9550 (a fixed factor, also) equals Power (in Kilowatt)

Now you've to find a motor whitch generates the right amount of torque running at the right speed. My choice is a Torcman 350-20 with 14pole and 28 windings. This company fabricates the motors in a standard program, but also they make them special to fit your project (amount of windings over 30).

Anyway, I didn't check this out yet but I believe Torcman's answers and datasheets. If I start testing the hydraulic I'll let you know and post the result.

Re: 1/10 Liebherr Excavator R 984 Litronic
 

Hi Kevin,

I wouldn't do this. Better you make a drain to the suction side of the pump to get rid of leak oil. Markus.

Re: 1/10 Liebherr Excavator R 984 Litronic
 

Hi

I must say that it was a very good looking 984.
I can not believe how you make all the parts. Do you have the original drawings or do you have an excavator disassembled that you copy?

To my next question. I have repaired a 984 many times and my brother drives one at the job. He is totally in love with it.
So I have planned to do a small copy of the counterweight to his birthday, but I have problems with the drawings. then I saw that you've just made one of those, and one that looked very much like the original.
So I was thinking of doing a little long shot and hear if you stil have the cad drawings and if you want to sell a copy to me.

I would be very grateful if you could. I'm a little tired of climbing on the machine with my measuring tape :)

Best regards, Joel Sundstrom

Re: 1/10 Liebherr Excavator R 984 Litronic
 

Hi Folks,

long time passed by and for some reasons i couldn't work real much on the project. Hopefully this will change in the next weeks. Anyway, a little work was done. First I made some drawings for more lasered and waterjet cut pieces for doing the pipework on the boom. Parts are made from steel, brass and polyamid/ nylon.

First some parts for keeping the bolts in place. The bolts with the rings are screwed together. The main bolt takes a endcap and those parts clamps the ring - just simple. The locking assembly is screwed with m1.6 screws to the frame. For setting the thread at the right place I used some drilling jigs.

Re: 1/10 Liebherr Excavator R 984 Litronic
 

Next was some work on the motor housing. Drawings were made for lasercutting and bending. For welding I used a big chunk of aluminum to draw out the heat. After welding I did some filing work. The whole cover is screwed together, I won't use hinges for single opening the lids. In case I take of the whole mounting.

Re: 1/10 Liebherr Excavator R 984 Litronic
 

Hello Markus K great job on the tracks I really like them so I will take 600 hundred links how soon can you have them done?:bounce: All kidding aside you have done a great job on building this excavator. Ed