MaxSupercars Posted October 29, 2015 Posted October 29, 2015 Nice MAN... I'm looking forward what it will be in the final... :) Max... Quote
efferman Posted October 30, 2015 Author Posted October 30, 2015 a offroad truck with some on the back btw, the cab is done with working steering wheel Quote
Zerobricks Posted October 30, 2015 Posted October 30, 2015 (edited) I spy my lil eye on a cracked U joint Jokes aside, thats an awesome model so far! Steering angle seems very high, over 35°? I hope the 12 tooth diff gears will hold, even though you have 3 (or is it 4?) x gear ratio after them.... By the way where are diff locks? Dont you know diffs are EVIL Edited October 30, 2015 by Zblj Quote
efferman Posted October 30, 2015 Author Posted October 30, 2015 It is a 4 to 1 planetary in the rim and there are 4 bevel gears in the diff. I will se how much torque the diffs can take before something is cracking. And diffs are not evil, loosing ground contact is evil. The steering angle on the front axle is roundabout between 35 and 40 degrees Quote
Paul P Posted October 30, 2015 Posted October 30, 2015 I spy my lil eye on a cracked U joint Jokes aside, thats an awesome model so far! Steering angle seems very high, over 35°? I hope the 12 tooth diff gears will hold, even though you have 3 (or is it 4?) x gear ratio after them.... By the way where are diff locks? Dont you know diffs are EVIL Cracked U joints, I put small rubber O rings on my U joint collars it stops them cracking but allows enough flex to push on an axle. Quote
efferman Posted October 31, 2015 Author Posted October 31, 2015 (edited) the large driveshafts are arrived the slide works perfectly, unfortunately the printed balls are to small and my two pieces 2907 sliding off the crossaxles Edited October 31, 2015 by efferman Quote
Imanol BB Posted October 31, 2015 Posted October 31, 2015 So sad that this is happening, i think you could try to put some springs inside the driveshafts to pull the balls and avoid the sliding off; but despite that, it seems very nice. Quote
efferman Posted October 31, 2015 Author Posted October 31, 2015 this is exactly what i have done, fortunately the springs of the large shock absorbers are fit inside, but unfortunately this results in a lot of friction. And you see in the video that the 4 xl are nearly stalled in some situations Quote
MaxSupercars Posted October 31, 2015 Posted October 31, 2015 (edited) Effe how much IR receivers do you use? 4? One for each motor? I see only one on the cab... Max... Edited October 31, 2015 by MaxSupercars Quote
efferman Posted October 31, 2015 Author Posted October 31, 2015 One receiver which powers a servo, which switches two pole reverser, wich are powering the 4 xl. Steering works with a pf L. Quote
2LegoOrNot2Lego... Posted October 31, 2015 Posted October 31, 2015 Those shafts are amazing, to bad it didn't bring what you hoped for... You had better performing off road vehicles in the past... Quote
MaxSupercars Posted October 31, 2015 Posted October 31, 2015 (edited) Effe sorry for asking, but I don't know if I understand well... :D So that IRR on the cab powers steering motor... You use pole reverser... And you use only this ONE IRR for 1 steering LM + 4 XLM ? If yes it would not be good because 1 IRR can not feed 4 XLM... Max... Edited October 31, 2015 by MaxSupercars Quote
efferman Posted October 31, 2015 Author Posted October 31, 2015 Yes, only one receiver for four xl motors Quote
Imanol BB Posted October 31, 2015 Posted October 31, 2015 What about if you put something inside the balls hole, like a piece of paper or something to tighten them to the axles, and also, have you tried to put one BB for each motor?, of course, if you have enough BBs. Quote
efferman Posted October 31, 2015 Author Posted October 31, 2015 I use one lipo for two xl and a third lipo for the receiver. Sure, more amps result in more torque, but killing the friction is first to do. Quote
MaxSupercars Posted October 31, 2015 Posted October 31, 2015 @effe: OK I understand now... @ImanollBB: One LiPo can sufficent feed 2 XLM... LiPo ist stronger that normal BB... Max... Quote
Zerobricks Posted November 1, 2015 Posted November 1, 2015 What about using brick-built U joints? Like these ones: They are a bit hard to see, black, next to diff. Quote
efferman Posted November 1, 2015 Author Posted November 1, 2015 (edited) like this? to large edit: after some dissassembling i know what was the reason for the most friction Someone has put a nylon washer between diff and 5x7 frame to avoid the juimp over the 20 tooth doublebevel gear. My 4 bevel gear diff has this washer in the mold. and this washer surface has made the friction. some grinding and it works much better now Edited November 1, 2015 by efferman Quote
z3_2drive Posted November 1, 2015 Posted November 1, 2015 Those driveshafts are perfect! I have a project in mind that could use those, I hope you manage to fix their problems. Quite the price tag though! Quote
efferman Posted November 2, 2015 Author Posted November 2, 2015 the set isnt optimized yet. more than 10 euro would be saved. flatbed is mostly done Quote
MaxSupercars Posted November 2, 2015 Posted November 2, 2015 Big heavy monster... nicee... :P ...do you use wheel reductions? What is the actual weight? Max... Quote
efferman Posted November 2, 2015 Author Posted November 2, 2015 The weight before the flatbed was 3,6 kg. The reduction in the wheels is 4:1 and in complete roundabout 11:1 Quote
efferman Posted November 3, 2015 Author Posted November 3, 2015 now its weight is 4850g with batteries, and the drivetrain is sometimes a bit overloaded Quote
MaxSupercars Posted November 3, 2015 Posted November 3, 2015 (edited) Nice big heavy monster... Hmm yes... it's a pity that drivetrain is overloaded... nice solution with big driveshafts... but plastic will be always plastic not metal... If you want to add more power you could add 2 additional XL Motors to another point in drivetrain but it will not be so realistic... Max... Edited November 3, 2015 by MaxSupercars Quote
efferman Posted November 3, 2015 Author Posted November 3, 2015 there is no plastic killed. on every axle i have a 12:20 combination which seems to jump over when the load is to high. Quote
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