Boxerlego

Now the hydraulic control valve is starting to take shape. What you see here is a hollowed out 2x4 brick with a hole that has a rubber grommet inserted in it to seal against the 4L bar. The control valve still needs more work but it is looking great.

This can have a double use if the proper spring inside the piston is able to be compressed by the air system pressure then the piston could maybe used as a . Sounds great. Until you got to drill the small holes in the piston seal. This part would require testing but due to the fact that your making shocks that means you got to make at least four shocks the same and it is all internal modification so if you wanted to test another size hole you would have to distinguish that shocks between other hole sizes. How small does the hole haft to be for this to work as desired?

@TwentyLeggedHen: Thanks! To clear things up the Hydraulic control valve will be made mostly out of Lego parts because the integral function will be much easier to be connected up the system. It is true I have made some modification to some Lego parts such as the 1/2 pins and pin connectors but not every Lego part will need modification for example the 4L Bar is left as is. Edit: Also I am going to use rubber O-rings to seal the 4L bar with the valve body. If the O-rings are installed correctly the hopefully the mineral oil wont leak out. I use the small pneumatic cylinder as an example as how the control rod function will be.

Here is a simple mockup of the hydraulic control valve in function. The pictures show the range of travel. The Idea with the hydraulic control valve lever is to make it of thin liftarms so it can incorporate several positions to function from. Recently I've manages to minimize the complete valve travel to 8mm now.

That is a very clever solution and nicely built too I must say. Great job!

I have no idea the amount of shear force the Lego pins/axles can survive. In order for the spool valve to handle the pressure I plan to put some type of glue on the connections. Also the spool valve travel is based on the valve body I plan to use. Another idea I've been thinking is to use rubber O-rings around the spool to have a better seal with the cylinder but there is no guide for the O-rings to sit on so I'm not sure about using the rubber O-rings. The spool size and the cylinder are pretty close I did some calculation and if the spool is in the exact center of the cylinder there would be a .06mm gap between the two parts.

Great point. I been thinking about this from the start and I came up with a idea that is based entirely on lego parts as the sliding spool valve. In order to minimize leakage between valve body components I went and sought out a proper size brass tube that can fit over a pin connector . This is where things get tricky. In order to save space with the design, I saw the pin connector in half and join the two end a main bar with 1/2 pins like this . Now this is not some thrown together part to look like a spool valve there is precise measurements here going on. Right now I will say that the complete valve travel is 10mm. That was a great question I also want to say that I got a Idea to make the control lever return to neutral or center position and hopefully the lever function wont be stiff as the pneumatic switch.

Making this spool valve on the Lego Scale is the main challenge for hydraulic control. My goal is to use only Lego parts and see where it goes from there. Once the spool valve can be made the hydraulic system will almost be complete, but for now this spool valve is the main hurdle and it will be down hill from there.

I built quite a bite of models with out the instruction book. I know that with the Droid Developer Kit that there was models that could only be built by the picture.

I agree mineral oil is the best but you have to be careful as to what mineral oil your going to use because some mineral oils out there have perfume in it and that will ruin the ABS plastic /Lego. Here is a great video about mineral oil.

Well It appears that Alasdair Ryan is correct. Was it that obvious This wood bearing I am making is still in the prototype production phase due to the fact that the bearing is measured in metric and all my wood drill bits are standard. My goal is to be able to press fit the bearing in the hole and secure the bearing in place that way. Once I get a metric wood drill bit then I will be able to further continue making.

Here are two pictures of a wood part that I made for something that I have been constructing. Can you figure out what goes inside this wood hole.

Thanks Brick Queen for your helpful insight on this matter. After 6 long days, the video still does not turn up in the search results. However One out of the Three videos I had uploaded did make it in to the search results after a week or so. I want to point out that I had bunch of problems around that video on the day it was uploaded, most noticeably is that team of monkeys error page came up several times when I tried to open that video up in the video manager. It was very frustrating, It felt like roadblock that was preventing me to from accessing the video. And due to the issues I was having with the video, I initially gave an entire day to see if things started to function properly for the first upload, but the problem persisted and so I deleted the video and re-uploaded it to see if the problems will be resolved this way. However all the problems I was having around the first video were still persistent in the second video but shortly with in the hour the problems stop and everything started working properly with in the video except for the fact that the video still did not exist in the search results filters.

A couple of months ago I started a thread about Hydraulics and gave some of my thoughts about it. Now I want to show you some of the parts. In Lego Scale! :laugh: This is the Hydraulic Gear Pump. It is powered by a small DC Motor. The black gear has a notch that fits over the dc motor drive shaft. Here is the accumulator. This is device that will pressurize the system. Note: that the tubing can fit easily right in the Technic hole.

Sounds Great. I cant wait to see. Make sure the motor drive shaft is 2.0mm in diameter and you will be good to go. The upgraded XL motor rpm is around 240- 260. Good Luck!

did you see how youtube went in to full action with this video... Note: that this happen the very same week I notice youtube suppressing my video.

For stubborn axles I like to push it out with this part and then use some pliers to finished it off. You can put tape around the tips of the pliers If you think your going to do damage the axle end. If I have no Pliers around I will gradually push the axle out with another axle.

The XL motor is difficult to take apart with out breaking the small flat clips at the end of the case. The only tool you will need to have is a small flat head screw driver that can completely fit over the dark gray clip. You are going to need to carefully chisel away some of the surface over the dark gray clip so you then can press the adjacent sides and pull apart. In the beginning of this video here shows how to press the sides together to take separate the motor case . When the motor is dissemble you then can use a file to smooth up the dark gray clips and make the edge so the two motor case can clip together. To extend the case you can either cut the light grey case in half and extend it with a equal size plastic pipe as the case, then rejoin the two halves together with fast drying super glue or you can cut out a hole in the back of the case so the motor can poke out the back. It is important for the motor to fit inside the case and lock together so the motor does not turn around. With 3D printer it would be awesome to make custom motor case that fit over the XL planetary gearbox and have bigger motor inside.

I believe it should take an hour, there is a specific search designed for that. Well I am just going to wait and see. Plus I got more videos to put up of Ed. I guess both of you did not see it either. Thanks.

Hi Eurobricks, I need a little Help! Yesterday I uploaded a video on youtube about Edward Leedskalnin and I did a video search on the complete title of the video... here is a link http://www.youtube.c...=week&lclk=week and the video does not appear in the weekly search results. The title of the video is "Edward Leedskalnin Magnetic Current". I know that YouTube is suppressing my video and it is making me MAD . Why is youtube doing this to me is there something they dont want you to see in my video. Can any one confirm or disprove my suspicion just do a search for yourself or click that link above and see if my video in the results... I'm going to keep uploading this video weekly and see if YT persist on suppressing my video on magnetic current.

I just got a Motor that does not need to be geared down to handle the load of Lego. :D

I actually like being able to plug the electrical connection in to the motors; however, it is understandable that keeping up with the electrical connection and motor separately can be quite the effort.

That is a Excellent Design of a Steam Traction Engine. I give it ☆☆☆☆☆.

Well let me tell you that the XL motor is not nearly as long as the L motor. So if we consider that every winding loop of the copper wire on the armature in the XL motor is reduced because of the small Length in armature size vs the longer armature length in the L motor, Which result in more length of copper wire to be used to warp the L motor armature. Then it can be establish that the XL motor is in fact more cost effective on copper then the L motor is just due to length of the armature. Now if that still does not make any sense to you can just dissemble your L and XL motor and pull the copper out for yourself and weigh it. Also the L motor has two magnets while the XL motor has one. As for the Servo motor if you were to go and compare prices on servo motor you will see that it is a fair price for it.

The servo motor price seems fair. That is much I thought it would go for. Well The XL Motor is New for starters. And for the rest of the reason the XL motor is more cost efficient above all others.