Posted June 6, 201410 yr This is the sixth LEGO tank i've build. Technically it's very similar to my Mark 5-2 except that i included a turret-ring this time. I did that to give extra stability to the turret: in the previous build the turret was a little too unstable. I also tried to make the turret even smaller. I think this turret is about 30% smaller that the previous one. The hull is also quite a bit smaller. I believe this is about as small as it can be unless i manage to make the firing mechanism even more compact, which I seriously doubt. Finally, I tried to detail the model a little, and made it a little less blocky, although I still have to learn a lot about that.
June 6, 201410 yr Looks good, but the hull looks too wide. I might use your shooting mechanism in a Sturmtiger.
June 6, 201410 yr Author Thanks for your feedback. Would be nice to see my shooting mechanism in another tank :).
June 7, 201410 yr maybe make the hull <30 studs wide and smooth the hull out with tiles. That should make it less chunky, and possibly add equpment (tools, spare road wheel) and sideskirts.
June 7, 201410 yr Very smooth turret mechanism and accurate targeting, realistic suspension, neat bodywork, this tank has it all, Makes me wonder if the ev3 gyro can be used to stabilize the gun on rough ground, like in this video.
June 7, 201410 yr Author Very smooth turret mechanism and accurate targeting, realistic suspension, neat bodywork, this tank has it all, Makes me wonder if the ev3 gyro can be used to stabilize the gun on rough ground, like in this video. Thanks! Yeah those self-stabilizing guns are fantastic :). I wish i had ev3 to play around with. I am sure it would open up a lot of new possibilities!
June 7, 201410 yr Thanks! Yeah those self-stabilizing guns are fantastic :). I wish i had ev3 to play around with. I am sure it would open up a lot of new possibilities! It could be possible with hockey springs or counter weights. Edited June 7, 201410 yr by Tommy Styrvoky
June 7, 201410 yr Author It could be possible with hockey springs or counter weights. Yes, using counter weights is possible indeed, i had something like that in my Mark 3. Only the pivot point in that tank was fixed, to make a system that can be aim remotely the pivot point will need to be movable. Which is far from impossible. BTW, pardon my ignorance, but what are hockey springs?
June 8, 201410 yr Yes, using counter weights is possible indeed, i had something like that in my Mark 3. Only the pivot point in that tank was fixed, to make a system that can be aim remotely the pivot point will need to be movable. Which is far from impossible. BTW, pardon my ignorance, but what are hockey springs? It's a return to center spring that is a compact 3x2x1
June 10, 201410 yr It's a return to center spring that is a compact 3x2x1 Yeah, he means this part: http://www.bricklink.com/catalogItem.asp?P=x928cx1 . Edited June 10, 201410 yr by matthewclso
June 10, 201410 yr Author Looks like an interesting part, never used it yet. But like Tommy said, it could be very useful indeed.
June 11, 201410 yr It's a very versitile part, it can be used for return to center steering, toson bar suspension. Here is a example for stabilizing some gun sway for heavier barrels, I have used this technique in some of my builds and it works very well. I'm not sure if you want the barrel to stabalize with the ground when moving or to prevent barrel sway up and down. http://www.mocpages.com/image_zoom.php?mocid=266873&id=/user_images/75123/1304490298m https://m.flickr.com/#/photos/100480897@N07/9986473564/ Edited June 11, 201410 yr by Tommy Styrvoky
June 11, 201410 yr Author Well ideally you'd want the gun to stay on target regardless of the angle of the hull, just like The Centurion MK III tank does in JM1971's video. As i envision it, that can partially be accomplished with a balanced free floating barrel, you can change the balancing point or just shift some weight from one side to the other to aim it up and down, possibly supported by a gyro as JM1971 suggested. Although it is a very versatile part, i don't see a way of accomplishing that with x928cx1.
June 11, 201410 yr Well ideally you'd want the gun to stay on target regardless of the angle of the hull, just like The Centurion MK III tank does in JM1971's video. As i envision it, that can partially be accomplished with a balanced free floating barrel, you can change the balancing point or just shift some weight from one side to the other to aim it up and down, possibly supported by a gyro as JM1971 suggested. Although it is a very versatile part, i don't see a way of accomplishing that with x928cx1. If you mounted them on the pivot point it could prevent unneccicary sway of barrel when going over small bumps and if the barrel and counterweights are heavy enough to move the springs. Also sariel used a counterweight system in his leopard 2 but the barrel couldn't elevate.
June 11, 201410 yr Author If you mounted them on the pivot point it could prevent unneccicary sway of barrel when going over small bumps and if the barrel and counterweights are heavy enough to move the springs. Also sariel used a counterweight system in his leopard 2 but the barrel couldn't elevate. The barrel on the Mark six doesn't really sway even when going over bumps. In the video near the end is seems as if the gun sways up a bit but it's actually the whole tank that is climbing elevated terrain. Actually what i would want is that it would sway in a particular way. What it should do it sway down when the chassis hits the bump and sway up when the chassis exits the bump. In such a way that the gun always stays on the target. Just like in JM's video. Like so: I just noticed the gyro JM1971 was tanking about is a sensor, which could also be useful as it would be able to detect the elevation of the hull and compensate for it. Thanks for the picture, those look interesting, though it's a bit hard to see what function x928cx1, actually plays. You'd think that based on the setup the barrel is connected to the pivot point on one side and the linear actuator on the other. And that the system is rigid. But i guess the barrel is actually connected to x928cx1 first and only then to the brace which is connected to both the pivot point and the linear actuator, thus dampening the movement of the hull for the barrel. Right?
June 11, 201410 yr The barrel on the Mark six doesn't really sway even when going over bumps. In the video near the end is seems as if the gun sways up a bit but it's actually the whole tank that is climbing elevated terrain. Actually what i would want is that it would sway in a particular way. What it should do it sway down when the chassis hits the bump and sway up when the chassis exits the bump. In such a way that the gun always stays on the target. Just like in JM's video. Like so: I just noticed the gyro JM1971 was tanking about is a sensor, which could also be useful as it would be able to detect the elevation of the hull and compensate for it. Thanks for the picture, those look interesting, though it's a bit hard to see what function x928cx1, actually plays. You'd think that based on the setup the barrel is connected to the pivot point on one side and the linear actuator on the other. And that the system is rigid. But i guess the barrel is actually connected to x928cx1 first and only then to the brace which is connected to both the pivot point and the linear actuator, thus dampening the movement of the hull for the barrel. Right? yeah it provides a constant tension on the axis of the barrel so it eliminates lash with the linear actuator , I might have to mess around with a system for a stabalizer.
June 25, 201410 yr I built a similar mechanism for my Sturmtiger, all thats left to do is to add a magazine. Edited June 25, 201410 yr by Tommy Styrvoky
June 25, 201410 yr Author I built a similar mechanism for my Sturmtiger, all thats left to do is to add a magazine. [media=899x500]https://flic.kr/p/o6T9LJ[/media] Very nice! I see you managed to make it more compact and nice use of the LEGO springs. Well done! Edited June 25, 201410 yr by Kelkschiz
June 25, 201410 yr Very nice! I see you managed to make it a lot more compact and nice use of the LEGO springs. Well done! I added 2 more springs and its making around 25 ft shots with 5 and 3 beams at head level.
June 25, 201410 yr Author I added 2 more springs and its making around 25 ft shots with 5 and 3 beams at head level. Yes i saw, i was thinking along similar lines, my current prototype also uses the 5 and 3 beams. But i don't have concrete plans for a new tank yet, so it's going slow. Although seeing your work does give me an itch... :) But first i'll have to finish the project i am working on, otherwise it will become a mess. Edited June 25, 201410 yr by Kelkschiz
June 25, 201410 yr Yes i saw, i was thinking along similar lines, my current prototype also uses the 5 and 3 beams. But i don't have concrete plans for a new tank yet, so it's going slow. Although seeing your work does give me an itch... :) But first i'll have to finish the project i am working on, otherwise it will become a mess. maybe base the tank off of a real vehicle for added challenge ?modern vehicles have very wide turrets. and what are you working on at the moment ? Edited June 25, 201410 yr by Tommy Styrvoky
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