CAT330D-L full hydraulic

[Erik79]

Hi everyone, i start showing some photos about the beginning of the construction.

The undercarriage by milling from a full piece of aluminium...

http://i.imgur.com/NgC2OHL.jpg

http://i.imgur.com/nGLcaBm.jpg

http://i.imgur.com/BrfuLBS.jpg

http://i.imgur.com/dQ3ey5G.jpg

http://i.imgur.com/raSMIQC.jpg

The rotary hydraulic manifold...

http://i.imgur.com/uiG8u8z.jpg

http://i.imgur.com/2bdnG3X.jpg

http://i.imgur.com/LVia9Ag.jpg

http://i.imgur.com/QTYS4u7.jpg

http://i.imgur.com/kUgxUSr.jpg

http://i.imgur.com/JbxwIQx.jpg

http://i.imgur.com/tPvEiq7.jpg

http://i.imgur.com/quRmEsa.jpg

The freewheel with its pin and sliders...

http://i.imgur.com/leIdkRt.jpg

http://i.imgur.com/DzxgjwX.jpg

http://i.imgur.com/SymwqCi.jpg

http://i.imgur.com/jk6g5eH.jpg

http://i.imgur.com/E9eDEA2.jpg

The freewheel support with the chain tension springs...

http://i.imgur.com/RvEPyor.jpg

http://i.imgur.com/CmJBM86.jpg

http://i.imgur.com/K6oj8WM.jpg

http://i.imgur.com/BwWzCdS.jpg

http://i.imgur.com/Hthgukc.jpg

http://i.imgur.com/IK0EPXn.jpg

http://i.imgur.com/Xng4wi3.jpg

http://i.imgur.com/Rr8Qp40.jpg

http://i.imgur.com/99BHikP.jpg

http://i.imgur.com/t47pQ8K.jpg

http://i.imgur.com/Zc94XvN.jpg

http://i.imgur.com/zQjv2iu.jpg

[Erik79]

And now the assembly...

http://i.imgur.com/4RkdLY1.jpg

http://i.imgur.com/fSn3uMR.jpg

http://i.imgur.com/mGunBIe.jpg

http://i.imgur.com/nYMpcOn.jpg

http://i.imgur.com/g54qWO3.jpg

http://i.imgur.com/ZSSTHdm.jpg

http://i.imgur.com/gEJ4pec.jpg

In the following the rotary Platform with only the main machining...

http://i.imgur.com/1K3H2ML.jpg

http://i.imgur.com/1K3H2ML.jpg

http://i.imgur.com/ZtLWi9L.jpg

http://i.imgur.com/8NVZbQi.jpg

See you soon!

[cabs]

Very nice work

[Dieselchopper]

Looks really good, keep it coming!!!

[liftmys10]

Amazing!

[Bo Wallen]

Great Clean Super Build......I will follow this job for sure. Where on the earth are you located ?

[avel]

WOW! Are you a professional CNC operator? Or just have one for personal projects?
Also who makes those hydraulic fittings?

[Erik79]

Thanks a lot to everyone...
@Bo Wallen: i'm from Florence.
@avel: i have been a manual/CNC machinist (mill and lathe etc.) for several years and begin to work with a lathe for hobby when i was 13 thanks to my father's mini lathe. But the work you see in photos is made by my personal manual lathe and mill (more heavy machines). The hydraulic fittings are made by SMC corporation in Japan. They sell all over the world and in the USA is more simple to find and buy it than in Europe. In Italy instead is a big problem... like for everything! Price is crazy!
You can buy it from www.smcpneumatics.com or even on Amazon. Search for "smc miniature fittings M series".

A few minutes and i'll send other photos...

See you soon!

[Erik79]

I'm here again with the model of the chain/shoe....

http://i.imgur.com/20bgaGU.jpg

http://i.imgur.com/WU3UFKK.jpg

http://i.imgur.com/q9SrerF.jpg

http://i.imgur.com/W2Id3Dj.jpg

http://i.imgur.com/Etuavc4.jpg

http://i.imgur.com/tDWM2di.jpg

http://i.imgur.com/1jIHPb2.jpg

And the beginning of the cylinders construction...

http://i.imgur.com/5eBfiV0.jpg

http://i.imgur.com/LZI6Td7.jpg

http://i.imgur.com/QPTA1kr.jpg

The first prototype of the hydraulic motor...

http://i.imgur.com/mryKWXm.jpg

http://i.imgur.com/SxpMTzI.jpg

http://i.imgur.com/cwPVOP5.jpg

http://i.imgur.com/aob4teg.jpg

http://i.imgur.com/KLFfmAk.jpg

http://i.imgur.com/IQhyZuP.jpg

http://i.imgur.com/roYQCJL.jpg

http://i.imgur.com/G28OmCW.jpg

http://i.imgur.com/wEuYCxQ.jpg

http://i.imgur.com/Bo4bkTf.jpg

http://i.imgur.com/EnP6StR.jpg

Goodbye!

[avel]

OK thanks, and keep the pictures coming.

[kerst]

Impressive!
How does the wheel motor work?

Kerst

[Cooper]

Yes I'm interested it that too, next time you have the wheel apart so us some pics of the way the hydraulics work. Very impressive build so far!

[robcakes]

very impressive build

[diesel950]

very nice work

[Hemi1966]

Great job:)
I'm also very interested of how you made the hydraulic motor, more details and video please.

[Erik79]

Hi everyone, thanks a lot.
The motor is of the orbital type and it has 7.8 cubic centimeters of capacity. This is the first attempt to build it and the torque is too low even if in general it works well. I have now to receive the special profiled rotor-stator coupling from an external laboratory that work with CNC mill and reassemble the motor for the tests.
Then i make a video....

[Erik79]

Thanks thuangs.

In the meantime some other photos...

The mini test bench for the hydraulic sistem,

http://i.imgur.com/1HHXY6g.jpg

http://i.imgur.com/5mBmiuq.jpg

http://i.imgur.com/vqcTHhu.jpg

http://i.imgur.com/7AwmdwL.jpg

The motor in place and the shoes on the motor,

http://i.imgur.com/SKEc1wB.jpg

http://i.imgur.com/GcCkfKd.jpg

http://i.imgur.com/QxNOlOS.jpg

And the hydraulic cylinders with some piping work,

http://i.imgur.com/Kfm8eDS.jpg

http://i.imgur.com/RizrDFN.jpg

http://i.imgur.com/vFWDF1M.jpg

http://i.imgur.com/eOEkZLE.jpg

http://i.imgur.com/yJwqdEH.jpg

See you....

[avel]

Beautiful!

[SmallHaul]

Very nice machine work.

You are displaying great patience and bravery for making the hydraulic rotary manifold and making hydraulic motors for the drives.

[Exclusive RC]

gorgeous! trully a work of art!

[thercfreak2012]

Nice work mate

[Erik79]

Thanks everybody!;)
@SmallHaul: Yes, the patience is a "must" for this kind of works on manual machine. The hydraulic motors has needed a lot of study too. Hope with the new CNC components it works well and has a lot of torque!:)

Now some other photos of the machine.
The arm painted with epoxy primer....

http://i.imgur.com/K8p2kzB.jpg

http://i.imgur.com/mjKACFD.jpg

http://i.imgur.com/M9Uje6j.jpg

http://i.imgur.com/Bzb2YLp.jpg

http://i.imgur.com/guvRQXO.jpg

http://i.imgur.com/EcOCYaS.jpg

Is made by aluminium sheets of 3 and 1,5 millimeters brazed together, so is box-shaped.

[Stuart]

WOW this is superb! will be watching this one for sure. What scale is it in? or did I miss that bit?

Stu

[Espeefan]

Wow! Beautiful machining. Hydraulic track drive motors too. Very cool. Everything looks great so far. This will be a nice build to keep an eye on.

[Erik79]

Thanks Espeefan and Stuart.:)
@Stuart: it is in 1:14,5 scale.

Here some photos of the chain rollers in stainless steel...

http://i.imgur.com/lfh3JAl.jpg

http://i.imgur.com/sArOIRW.jpg

http://i.imgur.com/ybtra7B.jpg

[Erik79]

Hi everyone, now i got the chain links just molded.
I put some of them under the model to see how is the first impression...

http://i.imgur.com/zgoELY8.jpg

http://i.imgur.com/yMpXBlO.jpg

http://i.imgur.com/2xj3cPk.jpg

http://i.imgur.com/GsAKFsK.jpg

http://i.imgur.com/hcYAbkC.jpg

http://i.imgur.com/uS7YRef.jpg

http://i.imgur.com/823AbCv.jpg

http://i.imgur.com/HLCPl0q.jpg

I have to drill the holes, to turn the pins and the rollers and to assemble all the parts with e-clips. Another patience work....

[RCKiwi]

Exceptional workmanship indeed. Keep the photos coming! :)

[anthonymcc]

Flawless machining and build work.

[JLTrinity]

Wow, amazing work. Congrats!

[cosworth34677]

wow that thing is crazy!!!! great work

[liftmys10]

Awesome job. Keep up the amazing work.

[Erik79]

Thanks a lot to everybody, i'm happy that you enjoy the model.

In the next photos the chain completed, only one side.

http://i.imgur.com/pFPERPL.jpg

http://i.imgur.com/iDydLSq.jpg

http://i.imgur.com/Cbv5edb.jpg

http://i.imgur.com/cFlZSIS.jpg

http://i.imgur.com/kQBXV6Z.jpg

http://i.imgur.com/n78v36K.jpg

http://i.imgur.com/BFqPnfp.jpg

See you soon...

[avel]

Wow! Nice tracks!

[RCP57]

This is looking so great! Did you cast the track pads yourself or????

Reg

[Erik79]

Hello everyone,

@ Rcp57: I have designed the scaled model of the pads on 3D CAD, built the model piece on my milling machine and find a factory that made the copy of the model by molding.

@Thuangs: The real machine has the options between 700mm, 800mm, and 850mm. This is the 800mm and in 1:14,5 scale is around 54,5mm (half millimeters lost due to the molding retirement). The inside Groove of the links is made for a wheel of 6mm and so is 6,5mm. Pins diameter is 3mm.

My greets,

Enrico

[Ramon]

Hi Erik,
Really nice work, I like the precision of your CNC parts. The hydraulics looking good as well. Do you have a drawing/sketch of the hydraulic motor?

[Erik79]

Thanks Ramon, but nothing that you have seen in the photos is made by CNC. Is made by manual lathe and mill. The part made by CNC is only the coupling of rotor/stator that i am waiting for complete and test the hydraulic motor. This coupling has a complex profile that can not be built by manual mill and the profile i have used for the first construction, only to test the overall working, is approximated and manual milled.
The motor is of the orbital type, has a 7.8 cubic centimeters of displacement, the distributor valve is of the disk type and the motor has no drain.
For now i still have to definitive test it and prefer to not publicize the particulated drawings, i'm sorry.

[Azonic]

Very clean build, if I were you I would make holes in the track pads where the dirt can escape from the idler and sprocket, if dirt packs up it can make the tracks skip or slip off, just a heads up! :)

[Erik79]

Thanks for your intervention Azonic, in effect the problem that you analize is well known. The reason for the decision to don't make that holes is mainly structural: the shoes are made to be as strong as possible and the holes in that position makes the middle section a little too thin. This is the same reason why i have choosen to don't make the holes that pass through the flank of the chain. Instead i have changed a little the design of the chain links in another zone to minimize the problem that you notice: if you carefully watch the point in which one shoe is coupling and slide with the following one (in the bend the chain makes around a wheel) you can see that there is an opening that (i hope) helps the dirt to not stuck in. In the past set of photos this detail is not so simply to observe but in the next you will clearly see it. Other further solution to the problem could be the lowering of the profile of the teeth on the sprocket.
Finally ther is a thing to say about this problem: the typical weight of this reproduction models is so low to amplificate a lot some limits in the functionality of the chain-shoes, so it seems to be a must to provide to a spring that makes the freewheel slides back to prevent the lock of the chain in the case a little stone is stucked in between.
I hope to have made the right choises and the chain works well, but i'll can say that only after some tests.
Any other constructive critical intervention from you and each others will be greatly appreciated.....;)

Bye!

(sorry everyone for my english, i'm not a mothertongue like you can see)

[ricm]

100% insane build - AWESOME......

stunning

:jaw::jaw::jaw::jaw::jaw::jaw::bounce::bounce:

[gipicarto]

... one of the best buildings ever seen, Congrats !

:cool:;):cool:;):cool:

[Erik79]

Many thanks to ricm and to gipicarto....
Per qunto riguarda gipicarto... scriviamoci in italiano visto che sono di Firenze!:D
Tu non mi conosci ma io conosco molto bene il tuo lavoro e... in un certo senso mi sembra di conoscere anche te. Siccome non ho mai avuto l'occasione di complimentarmi lo faccio adesso anche se è un piccolo O.T.. Non ho ancora avuto il piacere di vedere la tua macchina in movimento e mi piacerebbe moltissimo.
Grazie dei complimenti, faccio solo del mio meglio.

Goodbye everyone, see you soon!

[Old Guy]

Erick 79
Nice build very interested in your Hydraulic motors and how they will work, The only thing I've built is the hydraulic pumps to run my models

Earl

[Erik79]

Thank you Old Guy, i hope to show you the running motor in video as soon as possible.

Bye...

[JAMMER]

Erick 79 your pluming work is excellent especially the tight turns I have tried them before and I know how hard they are. The rest of your machine also is superior also. Ed

[Erik79]

Thanks Jammer, the plumbing work is less simple than it seems, it's true.
For the more tight turns in fact i have choosen to use the copper tube than the brass one. Moreover i have used some little brass wheels built by lathe with the same radius of the bend on the external and the radius of the tube in section; this is to prevent the buckling of the tube.
The problem on this kind of model is that we have to use tubes of bigger dimensions than the real machine and is very hard to find the way they have to pass through... :)

[Erik79]

Hi, i am here again with another little step...

http://i.imgur.com/wRVUzCX.jpg

http://i.imgur.com/ThUTVS1.jpg

http://i.imgur.com/EoDcQ3e.jpg

http://i.imgur.com/KURrFgq.jpg

http://i.imgur.com/5sXiZGN.jpg

This counterweight is only the model to cast the real piece with aluminium and first it has to be fed up, sanded, smoothed and Painted.
For now i only have started to fed it up...

Bye...

[Erik79]

Hi everyone, on monday i finished to prepare the model of the counterweight and i painted it. I have done some modification to the shape of the hooks for casting requirement.

http://i.imgur.com/bIzeTlf.jpg

http://i.imgur.com/8367mJd.jpg

http://i.imgur.com/10fZ5uA.jpg

And today i have got the casted piece...:D

http://i.imgur.com/usxMe6W.jpg

http://i.imgur.com/tPOLJrV.jpg

http://i.imgur.com/nreabFR.jpg

http://i.imgur.com/MAR4gaf.jpg

http://i.imgur.com/5DUzWvh.jpg

http://i.imgur.com/rf7NTzd.jpg

Goodbye everyone.:)

[avel]

Why aluminum for the counterweight?

[Erik79]

Hi avel,

I have choosen to build the model without iron parts because it's made for the work and by time is unavoidable that paint wear out and i prefer to don't have rust. So the project is born mainly with aluminium, brass and stainless steel.
In this configuration the center of gravity is very close to the axis of the swivel flange because the full metal undercarriage and platform plus the ni-mh batteries already helps to draw back the CoG. On the other hand the aluminium boom and stick are not so heavy. So i have no reason for trying to draw back more the CoG maybe with iron counterweight. :)

See you, my greets.

Enrico

[Erik79]

Hello, here some other photos of the assembly only to see the general appearance...

http://i.imgur.com/hNQRfDT.jpg

http://i.imgur.com/q5dtFV0.jpg

http://i.imgur.com/Ic7Rrc9.jpg

http://i.imgur.com/qlzGkJa.jpg

http://i.imgur.com/dQR9X9u.jpg

http://i.imgur.com/dQR9X9u.jpg

See you....:)

[avel]

Very nice!

[cosworth34677]

wow!!

[dabears]

Stunning work!!! I am definitely going to follow this one!

[Espeefan]

That counterweight is beautiful. It looked like a very clean casting, even before you smoothed and finished it. Great work!

[Erik79]

Thanks everyone!
Yes espeefan, the piece is well casted by the guys that have done the work. I have not the possibility to do a work like that from myself.
Now the next challenge is to build the opened center valves and more difficult is to put nine of them into the width of the cabin in an in-line assembly. The space available is 200mm of width and 59mm of height. I'm not a fan of the accessories like tong or quick tool change but i prefer to have the possibility to add them in the future.
I have already start to build the prototype of the valves and in a few days i'll test it and know if it works well or not.

See you soon.:)

Enrico

[Hofabooz]

Hi Enrico

This is a great build thank you for sharing with us all on the forum.
The quality is of the highest order.
keep up the good work.

Regards

Mark

[Erik79]

Hi Mark, many thanks!
Hope to have news soon...

[Erik79]

Hi, like i said i have worked on the open center valves and now i have done the prototype and started to test it.

The system working pressure is 22 Atm, relief pressure is 2-3 Atm with a current drain of 1,5-1,8 Amps and the pump at 20% of "gas". The valve has a dead-zone of 4° per side and in the center position the cylinder is well locked.
The proportionality is very good and the effort needed to rotate the valve is not much, but i have to measure it. In the video below i test 3 different rates, normal, high speed and something like an "inching mode" and it seems to work well in all the ones, so i am quite satisfied.

http://i.imgur.com/VG7mc0E.jpg

http://i.imgur.com/XWqKsrD.jpg

https://www.youtube.com/watch?v=6rOSZWjEAQI

My greets,:)

Enrico

[Rvjimd]

Very fun to watch the progress.

How do you make the tight bends in the small tubing and kink? The pictures are very nice!

Jim

[avel]

The tubing is very pliable but you can also immerse it in hot water and then bend it and once it cools it will hold it's shape a lot better.

Erik79, When you say open center valve do you mean that when the valve is closed the fluid is allowed to circulate through the system so that the pump runs more efficiently?

[Rvjimd]

Thanks, I meant to say NOT kink, and I should have also indicated the copper and aluminum tubing. I did a lot of aluminum tubing when I built my RV6 but it was all quite a bit bigger diameter than the stuff on the excavator and I was not going for the tight radius that I see here, and even that was trouble in a few spots.

Jim

[Erik79]

@avel, yes, exactly. In the video you can see when the valve is in the center position system pressure and current drain drastically decrease. In this condition the pump does not wear and produce the minimum of the heat, nevertheless the overall efficiency increase and so the autonomy become longer. In the center position with the MiMh 10 cells battery i have chosen the system can run hours and hours.

@rvjimd, the brass and copper tubes are not much simple to bend, but with some tools it's possible. I use some little metal wheels with the radial section of the same radius of the tube you have to bend. Next time i show you some photos.

Enrico.

[Erik79]

Hi everyone!:)

Recently i'm working to design and build the cabin of the model.

Some pictures from CAD...

http://i.imgur.com/e4volzw.jpg

http://i.imgur.com/EwAz7BE.jpg

http://i.imgur.com/91GtoEK.jpg

http://i.imgur.com/s9HUDjT.jpg

See you...

[Rimrock]

This is a great project) I see the advantage of milling the undercarrige from one piece, as one save quite much hours compared to build it the traditional way with plates. Gets a bit more heavy to carry around, but the machine will sit more stable, so I guess it is mostly an advantage. Eletric motors for the tracks are quite more efficient than hydraulic ones, but I guess you like to experiment to see if it is possible to make hydraulic motors work on a model excavator) From an technical point of view, it is more interesting and challanging to install hydraulic motors, I agree to that;) Look forward to see the finished machine, keep on the good work)

[Themonty73]

Wow this is an amazing project, please keep the pictures and videos coming, keep up the great work.

:bounce::bounce:

[Erik79]

Hi verybody!

@Rimrock: many thanks, i think you have perfectly understood my philosophy, agree with you on all the points.:)

@Themonty73: thanks, i try my best to show you something new as soon as possible...:)

Enrico

[Erik79]

Hi guys,:)

Now i have to show you some parts of the cabin, still under construction...

The console on the side of the seat,
http://i.imgur.com/Xha8nPP.jpg
http://i.imgur.com/66zyng3.jpg

The armrests,
http://i.imgur.com/S6Tz6iK.jpg

And the joysticks,
http://i.imgur.com/RqewiG9.jpg
http://i.imgur.com/zGYDT5I.jpg
http://i.imgur.com/hE3gbuK.jpg
http://i.imgur.com/RiOF7N8.jpg

Pretty soon the seat and the bellows on the bottom.

See you...

[Erik79]

Hy all,

I send you the first short video of the hydraulic motor running and, for who has not noticed the previous link, the open center valve video.

http://www.youtube.com/watch?v=8Bh3Zmr4MxM
http://www.youtube.com/watch?v=6rOSZWjEAQ

Bye...

Enrico

[jack van]

well this is a buetifull build your skill and attention to detail is amazing keep up pics wow

[Snowman3725]

Absolutely incredible. Any updates?

[Erik79]

Many thanks to Jack Van and Snowman, hope to have some new things soon.
For now i am still developing the internal of the cabin...

[Erik79]

Hi everyone,

Well, after a long long time away from the forums i'm here again...
And i'm happy for that. :)

Today i'm going to show you my recent project of a new hydraulic open center valve. I was searching for a valve with the best compromise between very low leakage, low actuation force needed, compactness, smoothness and the higher the possible lifespan.
So i built it a small scalaeproduction for me and some friends, and the final product seems to me very good.
I had in my mind something that could be fitted in a wide range of models, starting from the very small and up to models that weight 40-50Kg, so there was the needing for the valve to work well even with a quite high pressure. The result is a valve that can handle a pressure up to 50-60 Bar with the Hitec HS82, but until 30-40 Bar the Hitec HS 81 is enough.
To get a near-zero leakage and a good reliability over time i chosen to build it in alloy steel, hardened and ground with extra tight tolerances.
Here is a demo with 50 Bar of pressure but i tried with 60 Bar and it works very well too (but my actual brushless is not happy with that pressure and became quite hot).
The proportionality and smoothness seems to be very good even at the higher pressure, and this is not an easy thing to achieve.
These valves are already at work on a Cat 365 of a friend That weight 40Kg and has a pressure of 45 Bar. The model has done some months of various hard testing on natural compact soil and two days at the "ModelGame Bologna" in the past december: Sathurday and Sunday around seven hours a day with almost no stops and working hard with no issues.
So i'm quite satisfied.:)


http://youtu.be/OVUPcK1UuFo

[Azonic]

Nice to see you're back posting progress, went through the thread again and it amazes me, hope to see more pics and videos! :)

[Hofabooz]

Hi Enrico

Great to see you posting again cannot wait to see your progress on this amazing project.

Thanks

[Rimrock]

45 bar is still quite much for a 1/14 machine, the 365? The machine must slide often when trying to dig in to hard soil, with so much power? I try to stay at max 25-30 bar, to not have my machine move around too much, reduce the noise and heat, get longer battery life. But with open center it's less problems as the pump do not need to work at max pressure when valves in center, as with the standard closed center valves used.

[Erik79]

Hi Rimrock,:)
remember that this model is loaded with weights in the undercarriage, it's 40Kg.
There are a lot of working condition in wich the excavator has a very good grip on the tracks, for example when the tracks are partially stuck in mud or soft earth. In certain condition, trust in me, this model take full advantage of this pressure and in some cases i might push it to 50bar and is not too much.
With 45bar the excavator dig quite well in constipated earth with stones and small roots.
This CAT had the bore of cylinders of 15mm, so quite small, and the forearm plus the quick bucket change plus the bucket itself lead to a long negative lever to operate.
So raising the pressure to 45bar and with my custom built forearm cylinder with 18mm of bore, it becamed well balanced.
My open center valves help to save an estimated amount of energy between 10 to 25%. The leakage is near to zero and so the amount of electrical energy wasted in heat is very low. In this model, with an environmental temperature of 20celsius, the oil never overcome 40celsius neither after 8 hours of constant work. Moreover the open center bring the current drain at a very low level when the model is in standby. Another very important thing to do during the overall setup is the optimization of the radio mixing in order to get the best compromise between autonomy, power, speed of movements, etc. Finally, the battery lasts from 2.5 to 3 hours with lights, fan, cabin display and leds, double sound module; all switched on.
To go over is very hard...

Here is a video....
http://youtu.be/T-F4kJgpII8

[Erik79]

Sorry, i've done a mistake...

http://www.youtube.com/watch?v=T-F4kJgpII8

[trucker1970]

Is the full hydraulic CAT 330 complete? I just joined the forum and found this amazing build and when I saw it was from 2014 and the updates I was excited to see the final masterpiece! I did just watch a great video on thr hydraulic tracks that was super!! more more more ��

[Erik79]

Hi trucker 1970, thank you!:)

I'm working at the same time on various project, one of them is the hydraulic motors for the 330, so i hope to have it run with three motors on tracks and rotation very soon.
The problem is that I Always want to do little improvements on the motors and never be satisfied....
But little by little the performance of them became good.
Waiting to show you something new in a short time...

See you.

[Erik79]

In the meantime the links to another video of the Cat 365 at work and the hydraulic motor (latest version) running...

http://youtu.be/KAFrNXdCKX4

http://youtu.be/ThN9p7tunOM

[trucker1970]

Hi trucker 1970, thank you!:)

I'm working at the same time on various project, one of them is the hydraulic motors for the 330, so i hope to have it run with three motors on tracks and rotation very soon.
The problem is that I Always want to do little improvements on the motors and never be satisfied....
But little by little the performance of them became good.
Waiting to show you something new in a short time...

See you.

EXCELLENT!! I will gladly wait. After watching the most recent video of your tracks on youtube and the power and speed I know this build it going to be the best one ever! I will keep an eye on this thread and youtube. 👍🏻

[Azonic]

Wow! The track's looks great, speed seems perfect, this is a masterpiece!

How much tourqe do the track's have?

[DavidF]

Erik, what size and Kv motor is that running the pump, and whose pump is it?
I need one for my project....

[trucker1970]

Erik, what size and Kv motor is that running the pump, and whose pump is it?
I need one for my project....

Paolo may be able to assist as well

http://www.rctruckandconstruction.com/forumdisplay.php?f=117

[trucker1970]

Erik, what size and Kv motor is that running the pump, and whose pump is it?
I need one for my project....

here is a link he posted, but he says you need to special order they don't list it http://www.vivoil.com/en/

[DavidF]

Thanks trucker1970. Im working on making my own for now, but having trouble figuring out what motor to use. Thinking something in the 300Kv range to get the right flow, but not sure if it will have the torque to get the pressure. Hate to spend money on the wrong part. I have a thread started on the forum,http://rctruckandconstruction.com/showthread.php?t=12595

[trucker1970]

Thanks trucker1970. Im working on making my own for now, but having trouble figuring out what motor to use. Thinking something in the 300Kv range to get the right flow, but not sure if it will have the torque to get the pressure. Hate to spend money on the wrong part. I have a thread started on the forum,http://rctruckandconstruction.com/showthread.php?t=12595

oh NICE! I'll check it out

[Erik79]

Hi guys,

Thanks to trucker1970 and Azonic!

@ DavidF:
The pump shown on video is by an italian brand: "Vivoil, oleodinamica Vivolo" with a displacement of 0.25cc, max 9000 RPM. The brushless motor is a 1000Kv 25A outrunner and work with a 3s LiPo.

See you soon....

[DavidF]

Hi guys,

Thanks to trucker1970 and Azonic!

@ DavidF:
The pump shown on video is by an italian brand: "Vivoil, oleodinamica Vivolo" with a displacement of 0.25cc, max 9000 RPM. The brushless motor is a 1000Kv 25A outrunner and work with a 3s LiPo.

See you soon....

Thank you Erik79

[Erik79]

Hi guys,

Forgotten to answer to Azonic; the hydraulic motor setup like you see in video has a wheel torque of about 24-25 Kgcm at 25 BAR and can hold, without be backdriven at all, a torque of about 22 Kgcm.
But in this version the displacement is 15 cubic centimeters (for a wheel turn), so around twice the one of the first prototype.
Not a huge value, but is already proportional to the scaled torque of the real machine: the Cat 330D has a thrust equal to its weight, 30 Tons, and the model has a thrust of about 12 Kg like its final weight.

See you....

[550166681]

How do I get the drawing of a hydraulic motor?

[Erik79]

Hi 550166681,

Drawings of a real scale motor/reducer are easy to find on the net, search for excavator hydraulic final drive, excavator wheel drive, excavator wheel reducer, or something alike.

But in the case of a reproduction in 1/14,5 or even in 1/12 the drawings you can find are quite worthless. You can't downscale and replicate the complex design of a real motoreducer in a model. You have to make your own project symplifing a lot, reducing the number of components in the assembly and fixing your attention on efficiency.
And it's very hard, both the design and the build.

[skeeter]

A phenomenal build you have there. Great build skills, & an excellent engineering feat is the end result. You've got great talent for this stuff.

[Erik79]

Hi skeeter,

Wow, many thanks!!
I'm very happy that you like my work!

I saw some of your works too; really not bad.
You look interested in hydraulic, have you ever tried something alike?

Goodbye friend...

[skeeter]

Hi skeeter,

Wow, many thanks!!
I'm very happy that you like my work!

I saw some of your works too; really not bad.
You look interested in hydraulic, have you ever tried something alike?

Goodbye friend...

For now, the hydraulic stuff is a little out of my budget. Some day, I will have a hydraulic excavator.