Liebherr R954C

[Rebekah_harper]

hiya,

just thought I'd start my build thread for the R954.

I am building it for a friend as a fully hydraulic 1/14 scale machine.

Most parts I will be making my self other than the Hyd Pump and Hyd Rams.

the rest such as the Hyd motors for tracks and slew ring, Control valves and the slew joint are amongst those I will making in my shed of wonder and mistery.

it's a bit of a beast at around 16 Kg and a full length at stretch being just over 1000mm.

I will add the first pictrues on sunday. :)

[Rebekah_harper]

Here are some pictures

http://i526.photobucket.com/albums/cc346/rebekah3505/a6277e1e.jpg

http://i526.photobucket.com/albums/cc346/rebekah3505/4ac07753.jpg

http://i526.photobucket.com/albums/cc346/rebekah3505/4f649915.jpg

[Azonic]

Nice, looking forward to this!

[jtroyer06]

I can't wait to see more of this build!!!

[RCP57]

Cool, more scratch built excavators! I like it!

Reg

[pumptech]

Nice start,looking forward to this !!

[Rebekah_harper]

Just a little more done.

http://i526.photobucket.com/albums/cc346/rebekah3505/a633fbcc.jpg

Time is spent more on angles and making sure they are spot in.

[Pippoe]

A huge project and challenge!

Good luck. There's somebody building a 954 in a German forum (http://www.modelltruck.net/showthread.php?36935-Liebherr-954C-Litronic-1-14-5) too.

Impressive. This is going to be a beast.

Cheers

Pip

[Rebekah_harper]

Thank you. At 1/14 it's on the large side. But it's going to be fully hydraulic. I think I've seen the German build. Is it with electric tracks?

[dirtpusher9]

Wow, this is going to be a monster. I read that you were going to make the hydraulic motors and valves. I'd like to see that step by step as I would like to build my own. Great start on the build.

[Pippoe]

Hi there!
I think the German build has electric tracks, planetary drives with brushless outrunners. There's a picture on the last page of the thread.

How do you plan to get the hydraulic oil from the upper to the lower section of the excavator?

Cheers

Pip

[Rebekah_harper]

The transfer from body to undercarriage is done via a slew joint.
Alot of the the new parts are going to be made as the original.

Its long to explain but it's the easiest part out of the 3 hyd components I'm making. I'll post pictures when I have completed it. But it's a barrel system.

Bex

[Rebekah_harper]

Hiya,

Here you can see how the hydraulic components are being made.
Hyd motor, valve block and slew joint
http://i526.photobucket.com/albums/cc346/rebekah3505/59b36af4.jpg

Here is the barrel for the axial hyd motor.
http://i526.photobucket.com/albums/cc346/rebekah3505/cd40f4a1.jpg

[9W Monighan]

HMM, Pistachio nuts, graph paper,pencils. This build is getting interesting.
Oh, I forgot to mention shop built cigarettes too.

[Rebekah_harper]

All key components to successfully building a R954C lol

[JensR]

May I ask why you are going for an axial piston motor and not radial?

Axial machines typically have considerably higher RPMs than radial ones for a given power and hence lower torque on the shaft - are you using a gear between motor and chain wheel?

[Rebekah_harper]

Yeah I'm using a reduction gear box like in the real final drive.

[ihbuilder]

great work so far . I'll be watching the hyd. motor build ;) my dad has a hydash pulled appart for 1 of our koerings 6605 excavators , I've been tempted to build some mini 1's . It'll be a few years yet till I get all the equipment aquired :( unless I get a brain storm :D

[Rebekah_harper]

Just a little update:
The axial piston motor now has one piston.

http://i526.photobucket.com/albums/cc346/rebekah3505/87c799c2.jpg

http://i526.photobucket.com/albums/cc346/rebekah3505/b28febce.jpg
It does look wonky but that's because it's right on the end of it.

[ihbuilder]

Rebekah , you are a genius :D . I've been trying to figure out how to do the ball on the end of the piston . Thats a great idea ;)

[Rebekah_harper]

They are ball joints from a remote controlled Heli. Trex I think. M3 thread and 4mm ball. Piston is 5mm dia. Length is about 15mm

The cylinder barrel is about 25mm dia with 9 cylinders. Centre for drive output is 6mm

[ihbuilder]

you have my gears a turnin now :D;)I think it's a good thing my 385cl is still on the drawing board :D

[Rebekah_harper]

Well a short quick up date

This is what I am building in the right colours.
http://i526.photobucket.com/albums/cc346/rebekah3505/7c0645a2.jpg

The main effort has been designing parts.
This is the final drive unit. Possed a big head ache. But got in the end. Will require learning/making internal gear rings. And nope can't buy what I need, I've looked. Lol but if any one finds a 31mm ish dia and 15mm deep with a 0.5 mod then let me know other wise tips on making one would be awesome.
http://i526.photobucket.com/albums/cc346/rebekah3505/6d6a69cd.jpg

The under carriage has been redesigned and so has the boom since getting the model.
http://i526.photobucket.com/albums/cc346/rebekah3505/2940f25d.jpg

[ihbuilder]

only suggestion is to look at drill planetaries I have looked high and low for a source of internal ring gears . making them would be done on a shaper or if someone knows of a newer process I'm all ears . My dad just put a hy-dash for a koering 6605 back together (I didn't get pics of it :( ) it has 2 walking plates driven by 3 cams . All the parts for that setup except the cams could be made on a mill . I could make the cams on the lathe with a 4 jaw . this is quite a project that I want to attempt some day :) your doing a great job so far .

[wheelie]

Hi All.. I'm just an admiring lurker here but I like to help in finding solutions.. don't know if this information would be of any help .. http://www.sketchucation.com/forums/viewtopic.php?f=15&t=33876

[Rebekah_harper]

Hiya,

I thought I'd share this. It is one of the track, final drive hub.

http://i526.photobucket.com/albums/cc346/rebekah3505/1b3ca9a6.jpg

Doing things on manual machinery does take some thought but getting there.

[Izzy]

Nice find - those are sweet!

[Madda]

I look at your drawings and wonder - how is the motor connected to the sprocket? Could you explain or show a pic of it?

[Rebekah_harper]

I look at your drawings and wonder - how is the motor connected to the sprocket? Could you explain or show a pic of it?

Inside there is a double planetary gear box providing reduction and torque.

[Espeefan]

Wow! Seriously? An axial vane motor, in miniature? That's incredible. Kind of takes builds like these to a whole new level. There must be a lot of thought that goes into building something like this. Did you figure out the displacement of the motor, the pressure it would be run at, and the flow of your pump, in order to get a realistic operating speed? That's amazing.

[Rebekah_harper]

Yeah it's taking alot of planning to achieve this and I'm nearly ready for the prototype.
The one but last post on page one shows two parts of the motor. Once the prototype has been completed and tested I'm going to apply it as a pump too. The pump will then have three of these. 1 for tracks, 1 for boom and 1 for slewing.

[doodlebug]

Hi Rebekah, are you including a case drain line on the pump's and motor's, to deal with internal leakage? Same as full sized motor's and pump's. Just curious! That affect's how many port's are included in the rotary union.
Look's great so far.

Cheer's, Neil.

[Rebekah_harper]

That's a fair point. I'm leaving that option open. The port you're reffering to is on that's going up the middle.
Am not sure if I'm going to need it but will see what happens during testing.

[Rebekah_harper]

Just to give you an idea of size. This is the design of the upper body. It's 380mm long

http://i526.photobucket.com/albums/cc346/rebekah3505/f2aed7f0.jpg

[Izzy]

Very nice planning - easily understood that you have a pasion for this model - great to see - and great to learn from - thanks so much for sharring your journey! I am interested to see how the vane motor / pump turns out for you.
Q - do vane motors have a tendancy to cavatate on start up due to lackof pressure on the indiviual vanes?

I've like vane motors since they do self adjust for wear - at least on the vanes that is....

another place for planetaries are air tools - drills specifically - they use vane motors as well which inherintly need high RPM due to being pneumatic.
- check out a low RPM but large chuck hand drill.

Izzy

[Rebekah_harper]

The vane motor is something I will be making for some of the attachments. This is to provide rotation to the grab and shears.

Planning is key, I'm an ex digger driver and I haven't lost the love of diggers.

There are companies that build rc diggers but I believe only one does hydraulic tracks and slew control.

The motor is a scaled down version of the real thing. This is the best video that discribes the workings
http://www.youtube.com/watch?v=8l5FtW2E4_A&feature=youtube_gdata_player
Great thing is that it works for both pump and motor.

[ihbuilder]

Rebekah , don't you mean axial piston pump/motor ? or are you switching to a vain style ?

[Rebekah_harper]

The track and slew motors are going to be axial piston type. The vaine is for attachments.

[ihbuilder]

The track and slew motors are going to be axial piston type. The vaine is for attachments.

OK my appologies :o Sorry :o

[Rebekah_harper]

Just another little update.

I've just got the first run of bearings in just the second to go.

http://i526.photobucket.com/albums/cc346/rebekah3505/IMAG0007.jpg

[Rebekah_harper]

A quick video of the final drive with the double run of bearings

http://static.photobucket.com/player.swf?file=http://vid526.photobucket.com/albums/cc346/rebekah3505/VIDEO0002.mp4

[Rebekah_harper]

Just thought I'd show my under carriage. Welding aluminum is certainly a skill. Lol
http://i526.photobucket.com/albums/cc346/rebekah3505/IMAG0014.jpg

[dabears]

looking good!!

[Rebekah_harper]

Stated the hydraulic motor

http://i526.photobucket.com/albums/cc346/rebekah3505/IMAG0064.jpg