Ivan_M Posted September 6, 2017 Posted September 6, 2017 (edited) There seems to be a lot of crop sprayers lately so here is my WIP. It will be generic sprayer based on multiple sprayes I like, I take this pictures as reference: The features i would like to implement are: -Drive by one L motor - 3 modes of steering with two L motors. Motor for rear axle will switch direction with PF switch operated by M motor - Cabin on lead screw that can go up and down, operated by M motor - Pneumatic compressor with L motor - Pneumatic paralelogram - Pmeumatic folding of 2 section arm The scale is set by motorcycle wheels from BMW, approx 1:16 I love the rised wheels so I started with axles. To keep them as narrow as possible I decided to base them on worm gear so I can get each axle as high as necessary. Each axle is mounted to small turntable at top. I was surprised how stable the axles are. Since the pictures are not very good here is digital render how it works: WIP 4 by Ivan Moc, on Flickr And preliminary chasis with four of them: WIP 2 by Ivan Moc, on Flickr See the high ground clearance: WIP 1 by Ivan Moc, on Flickr Please note that the wheelbase is not final - it should be longer by 3 studs The last feature I have is cabin that can go up and down on lead screw: WIP 3 by Ivan Moc, on Flickr Edited October 20, 2017 by Ivan_M title Quote
mocbuild101 Posted September 6, 2017 Posted September 6, 2017 (edited) Those wheels suit it very nicely, but I think they need to closed off somehow... maybe with some dishes? Edited September 6, 2017 by mocbuild101 Tiny Typo Quote
Ivan_M Posted September 6, 2017 Author Posted September 6, 2017 21 minutes ago, mocbuild101 said: Those wheels suit it very nicely, but I think they need to closed off somehow... maybe with some dishes? Yes I will use 8x8 tile in white or 8x8 dish, whatever will come cheaper Quote
BrickbyBrickTechnic Posted September 6, 2017 Posted September 6, 2017 You have some really good progress, keep it up Quote
1gor Posted September 6, 2017 Posted September 6, 2017 (edited) Honestly your self propelled speayer looks better with narrow tires than my version with CLAAS tires. The only thing missing here is a suspension. All self-propelled sprayers have some kind of suspension. Keep up with the good work Edited September 6, 2017 by I_Igor Quote
Ivan_M Posted September 6, 2017 Author Posted September 6, 2017 58 minutes ago, I_Igor said: Honestly your self propelled speayer looks better with narrow tires than my version with CLAAS tires. The only thing missing here is a suspension. All self-propelled sprayers have some kind of suspension. Keep up with the good work Thank you! I wouldn't say that suspension is the only missing thing, I also miss variable track width and ground clearance. I already spent more than enough time developing these without aceptable sucess so I will pass them I'm always amazed how suspension works on real sprayers, incredible machines.. Quote
1gor Posted September 7, 2017 Posted September 7, 2017 (edited) I have managed to develope some kind of suspension which you can see here Perhaps it could be usefull to you... Variable width is more difficult to achieve and only with sprayers that have gray colored chassis so you can use gear rack from this years orange telehandler...container yard set if I remembered correctly Sprayer was done with wrong colors so I've decided to took it a part and make with motocross bike tires (when I buy additional). Edited September 7, 2017 by I_Igor Quote
Ivan_M Posted September 7, 2017 Author Posted September 7, 2017 I have of course seen you thread Mine suspension was quite similar, worm gear can slide over axle so I started there but I wasn't able to stay within 2 studs width and that is deal braker for me. Anyway, I have first design of arm: WIP Arm by Ivan Moc, on Flickr I made it too long just to test the design. It is 120 studs long, so it would mean total width ~33m and such arms are always with more than 1 hinge. The flex is very low, far end is only ~2-3 studs lower. The final arm will be 90 studs long on each side, representing the smaller arms that are ~24m wide. Quote
1gor Posted September 7, 2017 Posted September 7, 2017 I have also problem with width... Concept of arm design is good. Lets see what will be final solution Quote
Ivan_M Posted September 22, 2017 Author Posted September 22, 2017 I have a big update. I have been working on chasis and arms. I have addes L motor for drive, fake 4L engine and two L motors for steering. I have used the outer gear on small turntable at each axle to perform steering, but it proved to be too space demanding on place where I need the chasis to be narrow. So in the end I went wth 13L rack. The L motor drives worm gear -> 8t pinion and 12t bewel that moves the rack. Both axles uses the same setup. Gearing from drive motor is 8t pinion to 24t central differential and to each axle diff. The last motor I have added is M motor that runs pneumatic pump. I realized then that I'm running into some space isssues and there is no way to add motorized pneumatic valves. I may also sacrifice motorized PF switch for rear steering motor. I have micromotor that would fit, but I don't want to add such rare part because I intend to make instructions. The last thing I have been working on are arms. Obviously the first arm was totally useless as it was waaaay too thick. I realized the arms cannot exceed 3 studs when folded. That means the folding section must fold inside the first section. The initial design was 8 studs wide at the hinge, so I had to redesign it completely, making slight compromises to structural strength but I'm very satisfied with the result. Now the problem - the chasis as now can drive and steer but the axles are not very stable in parallel direction to each other. It means they make A shape after few turns due to small turntable tolerance. I guess this doesn't have solution, so the model will not be very playable, but the extreme ground clearance is one of the most importat feature the model has so I will keep it this way. WIP Arms by Ivan Moc, on Flickr WIP Chasis by Ivan Moc, on Flickr WIP Chasis by Ivan Moc, on Flickr WIP Underside by Ivan Moc, on Flickr WIP Chasis by Ivan Moc, on Flickr Quote
BrickbyBrickTechnic Posted September 22, 2017 Posted September 22, 2017 Wow, I quite like it so far. My question though, will the pneumatics be able to bend the tubing as much as it will need to (alot)? Also, the rear structure currently looks weak. Any chance that can improve? Quote
Paul Klop Posted September 23, 2017 Posted September 23, 2017 Looks good! I really like the solution with the driving. Do you also have the play on the wheels? (I had with the wheel hubs..) Quote
Ivan_M Posted September 23, 2017 Author Posted September 23, 2017 19 hours ago, BrickbyBrickTechnic said: Wow, I quite like it so far. My question though, will the pneumatics be able to bend the tubing as much as it will need to (alot)? Also, the rear structure currently looks weak. Any chance that can improve? Thank you, the tubing is not a problem, there is only one 90° bend, there is no tubing on 2nd section of arm. The rear will be strenghten more, I just have to add tank to figure how much space and where I have. 10 hours ago, Paul Klop said: Looks good! I really like the solution with the driving. Do you also have the play on the wheels? (I had with the wheel hubs..) Thank you, the play in axles is terrible The axles are strong in forward-backward direction and can hold a lot of weight, but they are weak in left-right direction. Driving straight is fine, but turning puts a lot of stress to them and they end in "A" shape. It is only lego, after all. You have to decide - high narrow axle like mine which is more for display or your solution (which I like, don't get me wrong) that is more playable... 9 hours ago, I_Igor said: Nice development Thank you! Quote
Paul Klop Posted September 23, 2017 Posted September 23, 2017 1 hour ago, Ivan_M said: Thank you, the play in axles is terrible The axles are strong in forward-backward direction and can hold a lot of weight, but they are weak in left-right direction. Driving straight is fine, but turning puts a lot of stress to them and they end in "A" shape. It is only lego, after all. You have to decide - high narrow axle like mine which is more for display or your solution (which I like, don't get me wrong) that is more playable... Yes, I understand what you mean... I tried to make the wheel hubs more with axles and that workes for my. I really like your design and maybe you can reinforce it with some 5L/3L beams instead of the bush... Also a beam between the gear racks.. Just saying, I don't tried it myself Quote
BrickbyBrickTechnic Posted September 23, 2017 Posted September 23, 2017 3 hours ago, Ivan_M said: , I just have to add tank to figure how much space and where I have. I'll give you a hint: not as much as you think Not kidding. Quote
Ivan_M Posted September 25, 2017 Author Posted September 25, 2017 I realized I can implement variable geometry paralelogram very easily, it was only a matter of replacing 9L liftarm with pneumatic cylinder, here is video showing it in movement. It is very helpful because I can tilt it to help arms to fold. The weight of the arms puts a lot of stress to the hinge and folding wasn't smooth at all. I'm overally happy with the back and I will probably leave it as it is. Maybe a dual cylinder for tilting would be nicer, but i have only 5 of them and as you can see, all are already used. Quote
1gor Posted September 25, 2017 Posted September 25, 2017 Variable geometry is nice idea, but now you have to hide this pneumatic hose spaghetti somewhere Quote
BrickbyBrickTechnic Posted September 25, 2017 Posted September 25, 2017 Good idea, though I'm not sure that it makes sense. Why would a crop sprayer have it? If you know why, please educate me Quote
Ivan_M Posted September 25, 2017 Author Posted September 25, 2017 1 hour ago, BrickbyBrickTechnic said: Good idea, though I'm not sure that it makes sense. Why would a crop sprayer have it? If you know why, please educate me I have seen it on various sprayers, I think its main purpose is to have more spraying options - sometimes you want to spray not directly from top but from side. I'm not entirely sure tho. I really need it to help with arm folding. 1 hour ago, I_Igor said: Variable geometry is nice idea, but now you have to hide this pneumatic hose spaghetti somewhere Yes that will be interesting, I have 4 pneumatic functions and running out of space Quote
Ivan_M Posted September 25, 2017 Author Posted September 25, 2017 Here is video showing how tilting helps with arm deploying and folding, it is necessary to work with valves quite preciselly but it works as I intended: Quote
Paul Klop Posted September 27, 2017 Posted September 27, 2017 On 25-9-2017 at 10:35 PM, Ivan_M said: Here is video showing how tilting helps with arm deploying and folding, it is necessary to work with valves quite preciselly but it works as I intended Try to make a stop block so it cannot tilt to much.. Hope that helps Quote
Ivan_M Posted October 20, 2017 Author Posted October 20, 2017 It is done, I was waiting a long time for 8x8 tiles to cover wheels. As you can see from the progress the only thing that was left to do was finsh the bodywork. So the final pictures and one crappy video: IMGP5059 by Ivan Moc, on Flickr IMGP5061 by Ivan Moc, on Flickr IMGP5062 by Ivan Moc, on Flickr IMGP5063 by Ivan Moc, on Flickr IMGP5064 by Ivan Moc, on Flickr IMGP5065 by Ivan Moc, on Flickr IMGP5066 by Ivan Moc, on Flickr IMGP5070 by Ivan Moc, on Flickr IMGP5071 by Ivan Moc, on Flickr IMGP5074 by Ivan Moc, on Flickr Quote
1gor Posted October 20, 2017 Posted October 20, 2017 It looks nice. With those dishes it looks finished Quote
BrickbyBrickTechnic Posted October 20, 2017 Posted October 20, 2017 I have no words. This is simply fantastic! Quote
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