trekman

http://www.brickshelf.com/gallery/mervyntomb/1CX/jcb1cx_pneumatics_scheme.jpg This is a basic schematic for the pneumatics of the 1CX Other images can be found here, after moderation. http://www.brickshelf.com/cgi-bin/gallery.cgi?f=561167

I have just finished building the truck with clam shell crane, and the first mod was to relocate all the pneumatic switches to the same side as the crane rotation. A bit fiddly, but worthwhile in that all main crane functions can now work from the one side. I also put proper spacing on the rear wheels and the proper wheel finishers on the front. (They are too much set in on the instructions.

Each motor provided pumped air flow in both directions through the switch. This allowed Infra Red remote control of the pneumatic cylinder. The cylinder is pumped out to a position or pumped back to a position. This allowed more accuracy on a pneumatic system than we would be used with. As normally it requires very fine adjustment of a pneumatic switch to create slight movement on a pneumatic cylinder. I am aware that performance has turned out to be poorer than I had hoped. But the significance is that the pneumatic system did work. The problem with one motor and six pumps, is that you have a lot of air, but little control. Linear actuators do offer the positional accuracy, but I did want to have the JCB 1CX to be as close to the real machine as possible. Thanks for the interest.

I present to you my effort in making a MOC of a JCB 1CX. The aim of this project was to incorporate a couple of features. 1. Motorised pneumatic switch compressor units 2. Transmit power to the "power slide" unit and backhoe rotation through 16L axles and sliding red 8T gears/ worm gears. Also to maintain the scale of the model as much as possible. Please bear in mind that the full size machine has an hydraulic pump which will fit within a 300x300x300mm space. In my MOC, a large part of the space below the seat and above the drive motor is consumed with the 6 mini pumps, 3 motors, and 9 switches. Being able to maintain the scaled dimensions even that this scale was a challenge, especially with all the functions. The basic principle of the pneumatic system is that three motors operate the 3 switches and power 2 pumps each. In rear mode this will operate the three cylinders on the backhoe. Moving the seat forward diverts the air flow in these six pipes to be sent to the front to operate the loader functions. The drive to the wheels was always kept on a separate IR channel, allowing the wheels to be driven when in front loader mode. After much trial and error, I did manage to get the powerslide on the backhoe working really well, This also allowed 170 degree rotation of the rear backhoe. However we are building in plastic, and as time progressed, and the addition of pipe work and additional weight, the rear backhoe does no longer function as well as intended. The powerslide frame has started to sag and struggle under friction. (The real machine would use grease here). The drive to the wheels was good intially, and could be further geared down through the horizontally mounted portal units. Due to the clearance required for the front lift cylinders, the bonnet is slightly narrower than normal. From a visual point of view, I am please with how the model worked out. Further improvements could be made to the pneumatics, but that required a major redesign, of which I am not prepared to do at this time. Your comments are welcomed.

Nice machine and well built. Before the days of power functions I built a MRT from mostly studded technic, it had only a few motorised functions whereas this build has everything. I do like the 3 steering modes and the overall clean lines of this machine.

Looking at the actual photos of the car, the wheel arch extensions are quite thin. Scaled down this would be near impossible with Lego. The use of the pneumatic hoses was a good choice. You have also captured the curves of the car very well. I like the use of the cheese slopes on the roof.

Quite a lot of stickers in my sets have not been applied. I am a poor lego builder, and the parts, particularly panels have to be reused elsewhere on other models. There is one thing having "lego soup" on a model, but it gets even more of an eyesore when it is lego soup with stickers. Excessive stickers as in the crawler have put me off purchasing, as the model looks too plain without them.

For a bit of fun I made a working lathe with working feeds. It had a 4 jaw chuck and was able to turn down a square block of oasis to round. Because I was working with LEGO, there was considerable deformation and deflection of the tool piece when cutting. I used a buggy motor to drive the chuck, with no gearing. There was a bit of load on the motor during cutting operations. I hope that you can do better.

Very good, and fast moving. We don't have to have a cup of tea while we are waiting on some of the rotations. A nice change from the crawlers, trucks and cars.

Despite what you think are flaws, that is a nice truck. I do understand that in Lego you are working with bulky items which are out of scale compared to what is used on actual machines. Nevertheless, I am glad that you posted it. Well done.

Oh No, now that is serious. Well done, great MOC

Just when I thought I had seen it all... Now that is a serious car. Well done.

If you use the technic cam, which has an odd 1 1/2 stud spacing, then you would be able to bring the cylinders back to back. The only downside is that you will need the thickness of 3-4 sheets of paper in between the bases as a shim. But it works for me and saves some space.

Really nice work to date. Much better than what I could do. Although I do find it hard to understand why some people would leave the building of the key attributes of the truck until the very end. Personally I always like to build items such as a crane early on, just to make sure that it will perform as expected.

If my MOC uses three PF receivers, to drive six motorised functions is that ok, or does it have to be the maximum of four functions? - I really could do with two S-bricks

Just like the others above, I do like the wing movement. Well done.

If you want to look at scale and proportions, then consider the Test Car, 8865. TLG didn't worry too much about the width between the wheels on that one. Instead they made sure that all features worked as they should. We should not get too hung up on exact scales. Despite the advancements in technic parts in recent days there are still limitations as to how narrow you can make a chassis and still get the front wheel drive and steering to operate.

Just when I thought I had saw it all, then this arrived. Amazing.

I had a good laugh when I saw the two models side by side. I think the main aim of the radical redesign was so that the parts, especially the lights and panels could be used to build a submarine as the B model.

I can understand that the model will be heavy, but it still is brilliant. Well done.

Great car and great video. It is good when we can have a laugh at some of these MOCs.

Very nice entry, it was worth the effort in the rework.

Very nice model, wheels are the right size and shape. Spitfire is very timely with 70th D-Day landing anniversary

I still use my older stuff. There are times when you will be glad of an older part - toothed toggle joint, or 24x43 wheels. Plates and studded beams will always be needed in my collection.

Now that is one nice tractor, with authentic working three point linkage and proper steering for the model. Well done, with very good notes and video.