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Construction Equipment If it digs, pushes, hauls dirt "off road" post it here. |
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#61
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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 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! |
#62
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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. Last edited by Markus K.; 04-05-2014 at 11:34 AM. |
#63
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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
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#64
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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
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#65
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Re: 1/10 Liebherr Excavator R 984 Litronic
Painstaking work on them tracks Markus, but no doubt they work perfectly.
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?
__________________
Sharing knowledge is one thing that defies basic arithmetic logic --- the more you share, the more you get! Joe |
#66
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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. |
#67
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Re: 1/10 Liebherr Excavator R 984 Litronic
The 4th pic, is the tabletop a meter square?
__________________
Sharing knowledge is one thing that defies basic arithmetic logic --- the more you share, the more you get! Joe |
#68
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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.
Last edited by Markus K.; 04-05-2014 at 07:44 PM. |
#69
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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!
__________________
Nathan |
#70
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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. |
#71
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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! |
#72
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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. |
#73
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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
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#74
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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 |
#75
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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. |
#76
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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. |
#77
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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 |
#78
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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. |
#79
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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.
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#80
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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? All kidding aside you have done a great job on building this excavator. Ed
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