efferman Posted January 23, 2011 Author Posted January 23, 2011 (edited) currently is planned a XL. i know, it sounds slow, but i think it is fast enough. if my way of thinking is correct, it will drive roundabout 3 meters per minute Edited January 23, 2011 by efferman Quote
Sam42 Posted January 23, 2011 Posted January 23, 2011 i like the way you're heading with this build, especially the torque tube style suspension, not sure on the gear ratio though.. i'm currently running approximately 1:6 with 2xls in my tt Landrover and thats's good enough for it to climb a 50 degree slope... Quote
efferman Posted January 23, 2011 Author Posted January 23, 2011 (edited) 1:6? this would result with my tires in 190mm per second. sounds like a racecar and a little bit to fast for rockclimbing. maybe i will add a 2speed gearbox i love the unimog chassis. much more simple than a live axle, but nearly the same flexibility. and it works on small models Edited January 23, 2011 by efferman Quote
Sam42 Posted January 23, 2011 Posted January 23, 2011 that does sound fast... what's the diameter on that tyre/rim set up? are you running 9v or 7.2v power? with a 94.8 wheel and tire combo, by my calcs the landrover does about 83mm per second or 0.18mph i think zblj's truck is even faster.... And yeah check technic bricks for the dl on those new cv joints from 8070.. they're on my next order to be placed with lego direct! Quote
efferman Posted January 23, 2011 Author Posted January 23, 2011 (edited) the circumference of my tires (diameter ca 102mm) is, rolled up on the ground, 320mm per round. the xl have 220rpm at 9V at 1:6 this result in 36.66rpm of the tire 36.66 rpm x 320 mm = 195.55 mm per second at 1:21 i will have 54,67mm per second is my calculation false? the new cv joints seems to be a nice part but currently nothing for me Edited January 23, 2011 by efferman Quote
Sam42 Posted January 23, 2011 Posted January 23, 2011 I was using sariel's gear calculator to give me the rpm, which seems to use the loaded rpm for a pf xl from philo's page of 146rpm rather than the un-loaded 220rpm, that would explain the difference in our initial calcs.... I'm not sure whether the loaded or un loaded would be best for the calculation.... though i'd lean towards un loaded for travel on level ground. The gear calc gave me 16.8rpm for an xl at 7.2v I used (94.8*pi)*(16.8/60)=83.39 mm per second to get the speed of the landrover.. using 220 rpm in place of the 146 used by sariel i get- (94.8 * pi) * ((220 / 6) / 60) = 182.002934 mm per second for it's speed.. using your wheel's circumference and 220rpm i get- (320 * (220 / 6)) / 60 = 195.555556 so our maths agrees!.. all this is getting a little bit like a tech principles lecture from my course but it is informative... Quote
Zerobricks Posted January 24, 2011 Posted January 24, 2011 I am worryed about your 12 tooth thin bewel gears. They are quite weak, and may break in the front axle. Also the front hub looks easy to pull apart, sorry. Quote
Sam42 Posted January 24, 2011 Posted January 24, 2011 I am worryed about your 12 tooth thin bewel gears. They are quite weak, and may break in the front axle. Also the front hub looks easy to pull apart, sorry. Those 12t bevels can be fragile at times! as can the 20t ones..... truck trial kills parts! by sam2442, on Flickr Quote
efferman Posted January 24, 2011 Author Posted January 24, 2011 (edited) sam, your picture says the truth. zblj, every lego gear can break. we will se if this jeep will become a new gear crusher. edit: i love the Mini LAs. with them i could build a really compact steering system. i build it at both axles and it works pretty smooth Edited January 24, 2011 by efferman Quote
Sam42 Posted January 24, 2011 Posted January 24, 2011 (edited) i love the Mini LAs. with them i could build a really compact steering system. ahhhhh i knew someone would beat me to it I was gonna look at putting those new mini LAs into steering system as soon as i could get my hands on them...... nice looking steering! Edited January 24, 2011 by Sam42 Quote
efferman Posted January 24, 2011 Author Posted January 24, 2011 anyone must be the first, and iam sure that is anybody out there, who was faster than me. We doesnt only see it yet currently iam working on the 2 speed transmission, and i think it goes to be a hard nut. Quote
efferman Posted January 25, 2011 Author Posted January 25, 2011 (edited) sorry for the doublepost, but i have made a little Vid with the different Gear Ratios the first ratio is fast, but the xl sounds a bit stressed when it climbs the wall. the second ratio has in my humbly opinion a good speed for heavy terrain. Edited January 25, 2011 by efferman Quote
Zerobricks Posted January 26, 2011 Posted January 26, 2011 I think the first gear will suffice for most terrain. Will you fix the axle bending? Quote
Miron Posted January 26, 2011 Posted January 26, 2011 It's really powerful now, but will it have enough torque with a full body? Maybe You should create now space for 2 xl-s so if it's needed, you can add some extra torque... One question: What type are these wheels? Are they the 94.8x44R? Quote
efferman Posted January 26, 2011 Author Posted January 26, 2011 (edited) I think the first gear will suffice for most terrain. Will you fix the axle bending? i will have both gears. in the vid i have tested a two speed gearbox, which could switched remoted. The axle bending is caused by a temporary fixation. maybe i will use a pneumatic suspension. but first i must build the body to see how much space i have. It's really powerful now, but will it have enough torque with a full body? Maybe You should create now space for 2 xhttp://www.eurobricks.com/forum/index.php?showtopic=51058&pid=911176&st=30entry911176l-s so if it's needed, you can add some extra torque... One question: What type are these wheels? Are they the 94.8x44R? i think with the low gear i have enough torque. to answer your tire question please klick here edit: i have mounted a big part of the body, to see where i have spce for the gearbox and the other things. i hope you can imagine now the final sizes Edited January 26, 2011 by efferman Quote
efferman Posted January 29, 2011 Author Posted January 29, 2011 I think the first gear will suffice for most terrain. Will you fix the axle bending? you was right. the torque is more than enough pleas correct me if iam wrong, but i think it performs great. no gearcrushing, only the MiniLA makes a nois if it runs at its end Quote
locoworks Posted January 29, 2011 Posted January 29, 2011 if you want a low gear system, what about the inline gearbox used on the first technic motor?? as i recall it stacked onto the motor and was a similar size without electrical connections. i don't know what the actual reduction was, but i was considering trying to redo the BIG blue motorcycle and sidecar and using that gearbox to drive a rack and pinion to do the steering. this gearbox i'm on about must be around 30!! years old by now cos i was still at school when they came out. i have no idea of their 'strength' either as i never gave it much grief. Quote
efferman Posted January 29, 2011 Author Posted January 29, 2011 (edited) sorry if my english is not enough, but is your post in the correct thread? edit If it is in the correct thread iknow which part do you mean, but i think this part is nothing for me Edited January 30, 2011 by efferman Quote
locoworks Posted January 30, 2011 Posted January 30, 2011 sorry if my english is not enough, but is your post in the correct thread? edit If it is in the correct thread iknow which part do you mean, but i think this part is nothing for me i think i'm responding ton how to get a low gear ratio?? the part would do it perhaps??? while googling to find it i found pictures of some sets i used to have 857,854 and 952. memorys. the gearbox i'm thinking of is the one matched to the 870 motor, set 872. Quote
efferman Posted January 31, 2011 Author Posted January 31, 2011 hm, well. a high gear ratio is not longer a problem because the portalaxle works great. but thanks for your help Quote
Sam42 Posted January 31, 2011 Posted January 31, 2011 from the outdoor test it looks like it functions well! i like the two speed gear box because it equated nicely a 2 speed splitter which you could get on a unimog drivetrain...... and you could use the super low ratio for hillclimbs or pulling tree stumps out! The progress on the body looks good but i'd prefer a unimog 401 cab! Quote
efferman Posted January 31, 2011 Author Posted January 31, 2011 thanks to get more grip i have lay yesterday evening a bedspread over a 120% ascending slope and the willys (with not finished body and 1:7,722 Gear ratio) climbs it up as would it drive on the flat ground. So it seems that the low gear is not neccessary but i make the gear switch remoted however. the factor of limitation is only the grip, because the limit on a slick surface is roundabout at a 105% ascending slope. btw,since the vid i have build the drivetrain a little bit smaller gallery A Unimog body should not be a problem, if i decide to build one. but first i will finish the willys body. Quote
Milan Posted February 2, 2011 Posted February 2, 2011 Great progress so far. I am glad you will make Unimog body, too. Quote
efferman Posted February 2, 2011 Author Posted February 2, 2011 (edited) thanks my brickshelf folder is currently offline, because i have uploaded new pics: now comes with the radiator grill the hardest part. edit: it was easier than i had thinked did i have hit the look of a willys? Edited February 2, 2011 by efferman Quote
Milan Posted February 3, 2011 Posted February 3, 2011 I like it, it looks like jeep, those 4x4 dishes are maybe a little too big, 3x3 might be better, but I kinda like the setup you made. Quote
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