Liebherr R954C

[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 I think it's a good thing my 385cl is still on the drawing board

[Rebekah_harper]

Well a short quick up date

This is what I am building in the right colours.


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.


The under carriage has been redesigned and so has the boom since getting the model.

[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/...p?f=15&t=33876

[Rebekah_harper]

Hiya,

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



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]

Originally Posted by 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?

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

[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=8l5Ft...e_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]

Originally Posted by Rebekah_harper

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

OK my appologies Sorry

[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/c...5/IMAG0007.jpg