jorgeopesi Posted December 12, 2020 Posted December 12, 2020 It will be a front shovel or a excavator or both. My challenge is not to have reference, I want to do it strong and playable with the less pieces I can. I started with the tracks and it was not easy at all... all the weight rest over the six small wheels to have less friction on the track gears and you can take off easy the turntable, each undercarriage and the center part. I would like to know if the small tracks will be a good idea to move the machine, I think I will have to do a test with a lot of weight to test it. I did not like at all the 42100 tracks because they are too big I wanted mine just 9 studs high. I still have a lot of work to do so I am quite happy. Quote
1gor Posted December 12, 2020 Posted December 12, 2020 What I like is the simple look if it, but somehow I do not like is chain driven 40 tooth gear...I prefer gears only, but that is just my opinion Quote
JintaiZ Posted December 12, 2020 Posted December 12, 2020 Just now, I_Igor said: What I like is the simple look if it, but somehow I do not like is chain driven 40 tooth gear...I prefer gears only, but that is just my opinion I'm assuming that it'll work and function better with a chain... Quote
1gor Posted December 12, 2020 Posted December 12, 2020 8 minutes ago, JintaiZ said: I'm assuming that it'll work and function better with a chain... Well I have tried something like that with PF servo on one my telehandler, but I was not happy with results at all, so I prefer more directly driven wheels or in this case sprockets... Quote
jorgeopesi Posted December 12, 2020 Author Posted December 12, 2020 it is what I like to know, I have room enough to put gears without problem. Quote
1gor Posted December 12, 2020 Posted December 12, 2020 4 minutes ago, jorgeopesi said: it is what I like to know, I have room enough to put gears without problem. Imho it could work for something that has not such amount of stress like powering whole vehicle, or you have to add some kind of tensioner... Quote
1974 Posted December 12, 2020 Posted December 12, 2020 (edited) Chain driven was what was used a long time ago, think 70's and before that, all the way back to steam shovels (even on trucks too). What is used now is hydraulic motors (motors driven by oil pressure, same as the actuators) but that is not something LEGO manufactures (not even pneumatic motors) A gear train is what LEGO uses today, but I've never seen that on an actuaul machine of this kind Both ways have a lot of slack. Only way to find out what works, is to build it However, the trick to get a proper chain working is all about tension. Same thing as in real life And to add, I'm a fan of chain driven things! Cheers, Ole Edited December 12, 2020 by 1974 Quote
jorgeopesi Posted December 12, 2020 Author Posted December 12, 2020 43 minutes ago, 1974 said: Chain driven was what was used a long time ago, think 70's and before that, all the way back to steam shovels (even on trucks too). What is used now is hydraulic motors (motors driven by oil pressure, same as the actuators) but that is not something LEGO manufactures (not even pneumatic motors) A gear train is what LEGO uses today, but I've never seen that on an actuaul machine of this kind Both ways have a lot of slack. Only way to find out what works, is to build it However, the trick to get a proper chain working is all about tension. Same thing as in real life And to add, I'm a fan of chain driven things! Cheers, Ole Thank you for the information I appreciat it, I have tested it and even without weight doesn't work so let's go back to the gear train. Quote
trekman Posted December 13, 2020 Posted December 13, 2020 I have found those chains to be quite delicate and not good for high loads, but an authentic solution. Quote
howitzer Posted December 13, 2020 Posted December 13, 2020 For some reason I'm fond of chains, they seem kinda cool. Unfortunately there appears to be very few cases where they are actually useful, as they can't transmit much of torque and they don't work nearly as smooth as gears. So I guess the gear-based drivetrain is what we're stuck with when making tracked vehicles. Quote
zoo Posted December 13, 2020 Posted December 13, 2020 I know there are construction equipment that use electric motors powered by dieselfueled genereators. Might be an option if you find a way to keep the gearing short and want to stay close to what is used in real life. I myself do not care so much if it is done in real life machines or not since there are lots of factors that differ from real life machines and way smaller size lego built models. For example, in the LEGO world linear actuators are a lot more powerful than the pneumatic counterparts but in real life, hydraulic cylinders are used because they are generaly way more efficient. Quote
jorgeopesi Posted December 20, 2020 Author Posted December 20, 2020 More progress, removable tracks by extracting 4 axles with stop from each, rigid center part and everything easy to modificate. As always they will not be the last undercarriage I will do looking to use less parts but I can at least do someting on top for a bit of change. Quote
jorgeopesi Posted December 24, 2020 Author Posted December 24, 2020 4 minutes ago, technicfan said: you should do the Broyt D1000T I have it in my mind with front shovels and now a bike... I do not have enough hands... Quote
1gor Posted December 24, 2020 Posted December 24, 2020 Or time... I suggest you to use frames as much as possible Quote
jorgeopesi Posted December 24, 2020 Author Posted December 24, 2020 7 hours ago, I_Igor said: Or time... I suggest you to use frames as much as possible To use frames is always the way... Quote
1gor Posted December 24, 2020 Posted December 24, 2020 8 minutes ago, jorgeopesi said: To use frames is always the way... I know; had to re-re-reinforce my telehandler chassis; when series of photos will be done this days I'll post them... How beneficial would be to have yellow frames Quote
jorgeopesi Posted December 24, 2020 Author Posted December 24, 2020 13 minutes ago, I_Igor said: I know; had to re-re-reinforce my telehandler chassis; when series of photos will be done this days I'll post them... How beneficial would be to have yellow frames I just have put my hands on big grey frames... I will use them... I do not know where and how but I will... Quote
1gor Posted December 24, 2020 Posted December 24, 2020 Just now, jorgeopesi said: I just have put my hands on big grey frames... I will use them... I do not know where and how but I will... 11 x 15? That one's I need for my other project; the one that i send you that uses tatra axles...and I still look for it... Quote
jorgeopesi Posted December 24, 2020 Author Posted December 24, 2020 Just now, I_Igor said: 11 x 15? That one's I need for my other project; the one that i send you that uses tatra axles...and I still look for it... Yes we will say that Santa already came a bit... Quote
1gor Posted December 24, 2020 Posted December 24, 2020 30 minutes ago, jorgeopesi said: Yes we will say that Santa already came a bit... I know the feeling; need 3 of them but my budget does not allow polybag now so Sian (even LEGO) is a dream... Quote
jorgeopesi Posted December 27, 2020 Author Posted December 27, 2020 I already knew something was wrong. After do the undercarriage I did not know what to do so I decided to do the outside and I came to this huge thing, I loved those sprockets and I wanted to use them but they do to too big the MOC so turn back... I can not do something of this size it would be impossible with my way of think each step could have many valid solutions and I would go crazy... I will reduce the scale and we will see... Quote
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