ฝัง
- เผยแพร่เมื่อ 9 พ.ค. 2024
- So that’s how I made the 3D Printed 41 MPH RC car
0:00 Intro
0:55 Gears
4:00 Shaft & Wheel Hub
5:32 Suspension
7:11 Suspension & Steering Mechanism
9:31 Structural Support
10:18 Rotors & Gear Ratio
12:14 Conclusion
12:27 Patreon
Patreon / jinanprojects
Parts list:
3800KV Sensored Brushless Motor amzn.to/3qolsVy
10BL 120 Sensored ESC amzn.to/43UMCkQ
2S 7.4V Lipo Battery amzn.to/33VmE3X
35kg Coreless Servo Motor amzn.to/3QrNOJ6
GPS Speedometer amzn.to/3OiqH14
Transmitter & Receiver amzn.to/43WF012
0.05", OD 0.47", length 2" Spring amzn.to/3YqaGus
M3 Ball joint amzn.to/3QuBmso
Tools:
Ender 3 V2 3D Printer amzn.to/44Zc6im
Tough PLA amzn.to/3OgomUo
NOTE: the product URLs are Amazon affiliate links.
Intro Track: Xavy Rusan - Ga$ Money (Instrumental Version)
www.epidemicsound.com/artists...
License provided by EpidemicSound
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/ jinan.jpg - วิทยาศาสตร์และเทคโนโลยี
please tell me that u used grease for the gears and a fast car like that needs a gyro
I used Vaseline lol
Yea, there's a gyro setting built in the receiver which I later turned on. I should've mentioned it in the video
Shouldn't NEED a gyro, personally I don't like them, if my car is wobbling around then something is wrong.
@@jinanprojects don’t use grease it will end up as a grinding paste
A fast car needing a gyro?? No it needs to handle before fitting a gyro! Not just a Band-Aid fix
@@TwitchFastexactly people need to learn about handling dynamics and set up before wasting money or commenting causing someone else to waste it
65.98Kph. You’re welcome, metric system users.
Thank you our lord
@@TBprintfarm 😂
It is a superior system and I’m from the USA
Users of the Correct method yes
You can try testing with herringbone gears to get rid of the axial force. These are basically two opposing helical gears put together where each half counter acts the axial forces from the other half.
Yes, this.
Or, even easier, just use two helical gears, put side by side with opposite axial force directions. Heringbone gears are a little bit difficult to manufacture conventionaly, with a printer it is easier, but simply mirror the first gear makes it even more simple.
They also reduce sound
i was thinking of this or he could use a belt to reduce the stress on his gears but then he would have as precise control of his velocity (this could mitigated with a PID or something similar but thats too much work and that over complicates things). for me, his biggest error was placing all the stress into a small gear, if he had placed two 2:1 gears the stress would be reduces enough ( i believe, i dont remember that class that well)
I'm dumb enough to not get 95% of the technical stuff but your presentation was so clean it kept me intrigued the whole way through. So glad I was here to see you grow little by little.
Thanks man! It means a lot
@@jinanprojectsMy pleasure dude.
As a suspension engineer I suggest adding caster to the front wheels for extra front end stability. Right now everything is centered which is not the best for high speeds. Great video tho. that RC is a beast.
I am not a suspension engineer, but I guess, that this suspention is just making things worse. The point of having a suspention is to dampen oscilations. The car shouldn't jump when you drop it. It's better to switch to off-the-shelf rc shocks
0:32 I thought this too at first but the KV rating of a motor doesn’t mean kilovolt. The KV is actually the rpm needed to produce 1 volt of back emf, so a 3800 KV motor will need 3800 rpm to produce 1 volt or back emf. It also dictates how fast the motor can go, since an ideal motors max speed is reached when the back emf equals the input voltage and the motor will use no power, but due to non ideal conditions due to friction and other factors the back emf doesn’t reach the input voltage so it always uses at least a small amount of current.
When you add a load to a motor it slows down the motor and that in turn leads to a drop in the back emf, which means the voltage across the motor increases and hence it uses more current. In a stall condition the motor isn’t spinning so isn’t producing any back emf and hence the motor winding has the full voltage across it, this causes a very high current, in DC motors you are essentially taking the inductor which is the motor windings and just turning it into a resistor since with no changing currents the inductor has no resistance.
Lot of info here, thanks.
It's funny. I just learned about double wishbone suspension systems yesterday, and here you are designing one. I really liked your visual demo.
Incredible. Well done! Thank you for sharing, great video.
This was a nice video to watch, lots of useful information too!
The reason the axle was printed lying down on the bed and with a flat spot is so the extruded lines go right down the length of the part. The individual extruded lines are stronger than the layer adhesion, when you oriented it vertically the only thing holding it together was the layer adhesion.
A better option if possible would be to print the axle in two halves, both lying flat on the bed and combining to make a cylindrical shaft. Or you could just flatten the other side of the shaft to balance it.
appreciate the help with cad along with the video, subbed! Great vid man
half your problem is the material you are printing with. You need a stronger polymer. In the RC car biz, the gears are steel and a plastic material. Shocks are, most of the time, aluminum with rubber o-rings to seal and hold things together.
you have a super cool idea here! Congrats on making it work! Some refinement, and you are set!
As a solution to the helical gear issue, you can try doing a double helical gear or herringbone gear. ABS would also be a better material for gears for the higher melting temp.
Oh finally a new video I've been waiting for so long
I just found your channel and i must say. You have great editing skills for the size of channel. I have been searching for 3d printed rc car content for a while and this video makes me want to just start from scratch and make my own. I will aay tho. I would make an enclosed gearbox that can hold onto grease in order to reach high speeds without eating through gears.
Woah thank you! I love learning and being entertained. nice video
This was a great learning experience for me, as a viewer.!
At zero load the motor spins at 100% rpm potential. At 50% load it spins at 50% percent rpm. It is a inverse linear relationship.
For motors like this you do not want them loaded more than 30% at top speed (for multiple minutes of high speed driving). Should be easy to figure out, measure the zero load RPM and you can do the math on MPH to RPM to see what the load is.
Also, are you going to add suspension on the rear axle? I’d recommend looking at the old school classic RC10L chassis, which had a solid rear axle and was able to do some suspension on it.
Awesome video!
Very clever that u put engineers thought and fix problem along the way. If you had all the parts drawing i like to get and make 1 from u. Thanks
Good!! Job! Man! it looks very good. all the work you did is very hard to do without proper math and material...very cool!
the explanations are great!
I'm surprised you didn't use double helical gears for the motor. They get rid of the axial force issue that helical gears introduce and are still easy to 3D print.
If the gear generator doesn't happen to have an option for those, just mirror one half-as-thick helical gear back to back.
And as the other guy suggested: create an enclosure for them while at that, so you can put grease on them and have it not be thrown into orbit after 5 seconds.
Just grease without an enclosure will do basically nothing, as it will just be flung out the second you throttle up.
Unless you're using graphite powder, that might be sufficient in a thin layer that could stick around, literally.
Backseat engineering aside: a very impressive project you got there 👍
Herringbone gears is what you're describing.
@@greggeshelman double helical/herringbone are synonymous, yes.
best intro i've ever seen
This was awesome! Great job on jour design, it can only go up from there. I'd like to see what you come up with next. Subbed for sure!
Excellent work
what a great engineer
You can print double helix gears which is just two opposite angle helical gears side by side, but printed as one piece. They self-center which is nice and you lose less energy. They also have a nice benefit of being a little quieter than other gears.
Nice project! By the way, have you considered using metal gear for the drive? Or you plan to make all of the parts to be 3d printed?
Fantastic!
You can get rid of axical force on helical gears with herringbone gear. It basically is a double helical gear so the forces cancel out.
5:26 , I'm very curious to know how you made this animation because it looks really well and amazing. I want to do something similar for my school projects. And finally, I want to congratulate you on the quality of your videos, personally, I appreciate every detail, every post-production effect in your videos. My respects, and keep it up.
most likely build in to the cad software, in his case solidworks
Double helical gears are a great option for 3d printed gears. Reorienting the fan could allow you to use the cooling system as a down force generator. Active down force like that will be super useful for sustainable high speeds because of the scaling problems of aero. If it always crashes the model could end up being overbuilt. I really hope this helps. No matter what I'm loving this project man. Good luck.
For a practical example of Generated down force at full scale, look at the Redbull X201X series of concept racers.
If it helps they are also called herringbone gears
@@Sun0faBeach1i was thinking the same
Cooling fan downforce on a 40+mph car 😂
The herringbone gear was a Citroen design very strong and eliminates side thrust
very impressive!!!
Those first 3sec triggered my PTSD. That is somewhat like how I totalled my 1/16 RC car.
awesome. one input: the dampers should be oil filled as they don't make the car so jumpy.
Amazing.
Really nice video! Good job
"there you go, you're done" at 3:00 cracked me up
Thanks buddy
Awesome video! You should consider printing in ABS. It’s it’s just hard to compete with the durability.
bro... how or where, you get that library for the gears in solidworks... so awesome (1:51
)
Impressive
3:44 Could you try v-shaped helical gears (herringbone gears) to cancel the axial force?
Wow ive literally been working on this for a year bru i thought i was the only one struggling 😂
Do you need parallel lipo batteries really? Because one battery also can burst higher current than that 540 type brushless needs. Paralleling only may for longer duration work.
u could use the gears as a fan if u print blades in the inner part of them
Did you never try to make the slanted gears chevron shaped? That would very easily fix that axial force problem.
I too made an rc car using 1000kv 2212 bldc drone a motor and 8mm steel rod used for 3d printers.
I used a 3d printer 6mm belt and 2 gt2 pulleys for a belt d4ive with a 2:1 reduction.
Having 3d printed rotating parts is a very bad idea. they snap at the slightest torque and cant bear loads.
3D Printed RC boat next please!
Nice Bro ... i just subscribed your channel
Did you made some specifc configurations on your ender 3 v2 to get this smooth printing or you polished everything after?
Yea, I made a lot of modifications on my ender 3 v2. I'll probably make a video about it in the future
You can get a lot of stability with an aerodynamic design.
Nice 3d proget
Maybe a cool idea: a CVT gear
You should post this on the 3d printing subreddit and the RC car subreddit
You can avoid the radial force by using herringbone gears. It's just two mirrored helical gears that either touch in the middle (herringbone) or don't (double helix).
Why didn't you jsed that suspension that's used in Formula cars. With a horizontally orientated shock absorber
Why not use double helical or "herring-bone" gears?
Maybe look at herringbone gears? So side thrust of gear pair going to be balanced.
try using herringbone gear and timming belt and pulley as well
You would need dual helical for making sure the gear not sliding one way or another.
which resin you used for springs and tyres?
That was nice! Good job!
Why dont you try to print in PETG or ABS? it will be less rigid but more durable in teory
I actually wanted to use nylon filament for the gears but the layers kept separating after printing for some reason...
@@jinanprojects that is commonly a sign of not using a high enough temperature or having too much cooling, it happens because the current layer doesn’t melt into the layer below it properly, you should try less cooling and a higher temperature. Ideally for filaments like nylon you want an enclosure too, to help reduce cooling more and to keep the part hotter, so less likely to warp and better layer adhesion.
can you please put a link on how u made the base of this car please i need it already have all the parts i just need to 3d print the car model
Idk if your ever gonna see this but you may want to design a body so the car is significantly more aero dynamic
Yea, maybe for the next iteration
@@jinanprojects your car seems to be somewhat unstable at high speeds so making a aerodynamic body that generates decent downforce will help you.
9:00 I believe that's called bump steer. Is that right? Is that right? Do you know if your solution fixes that problem?
really like it though, a pretty nice project hat surely needs a lot of determination, btw what is traction 😂
How much did the parts cost without the 3d printed parts?
Kv is not kila volt or is constant velocity
Tell me, friend, what program will you use to design this?
SolidWorks
Triangles are used because of old technological processes. Because all that structures made of standard straight items like pipes, H-beams etc. 3D printing allows you to make hollow shapes and get better mass/weight characteristics.
what type batteries did u use
instead of 4 springs in the front, try to make the two front wheels independent, and try one spring down the middle like an average GT12 class RC car or an F1 rc car. I'm just curious as to how it would do on your 3D printed model!
The two front wheels on his design are completely independent. I don't know why he has used two springs per side though. One issue is that he failed to use shock absorbers so the springs are completely undamped so the thing is basically a trampoline.
@@samharper242 he used two per wheel because one spring wasn't strong enough to hold the weight
GS
Which software are you using for making 3d parts
SolidWorks
@@jinanprojects Thanks although subscribed already and lot likes.
the front suspension looks like its under too much preload causing it to have a trampoline like bouncing effect. You don't want to compress the springs much when putting the struts together.
wow! Really great! Hi Jinan, I'm still waiting for you
Can't you make duel direction helical gears in solid works?
Helical gears are ideal for high torque transmission. Not for highspeed because of the larger contact area and converging or diverging force which makes it a lot less efficient than the standard helical gear or spur gear
@@jinanprojectsin rc racing we use straight cut gears. There is no need to be fancy.
may I know where do you live and where are you from?
you would have tried double helical gears
you can use helical gears but you need to do double one pointing in one pointing out. think Herringbone.
I thought about using herringbone gears, but the larger contact surface area of those gears causes more friction and therefore reduce the output rpm. They are usually used for high torque applications as far as I know
Regardless, I should have tested herringbone gears to see how it actually performed
11:17 that rc car broke faster and harder than my hopes and dreams 😂😂😂
Lol 😂
Iam amazed by your solidworks skills. Where did you learn it.
From youtube, school, & people. Mostly youtube btw...
@@jinanprojects can you recommend me the channel?
What software did you use to model the pieces and to make the animations throughout the video?
SolidWorks for all the CAD & animations
What software did you use?
SolidWorks
U could used tpu it's a lot stranger cool video
I'm looking into buying a 3d printer here over in the uk
bro, how much years did you spend on this amazing wotk. when i was watching this video i felt stupid af
Cool model. Some parts must be metal due to operating conditions, e.g. heat. Bumpers and wider tires would also be useful.
❤❤
bigger motor goes hard
what bearings are you using for the rear shaft?
I used 12x18x4mm 6701-2RS bearings
amzn.to/49E5WWM
thx@@jinanprojects
for those subscribed on patreon will we ever get an instructional pdf?@@jinanprojects
front shock system need to design shorter travel and with damper, should have better on road handling. Rear missing shock design?
In race cars, straight cut gears are best. Same for RC cars.
Straight cut are better for torque capability and simplicity of manufacture for sure, plus have the benefit of no axial forces I agree. They're relatively limited in ratio range but if you have huge differences in gear size it's going to be a fun trade-off between strength/efficiency of a single pair, or using an intermediate set and accepting the efficiency hit to get a meshable set with less rotating mass etc. Drop them into a small bath casing and put a super light lube in there that just picks up the tips of the teeth and mists the lube without adding much drag.
What software do you use it to design the car
Solidworks
@@jinanprojects 👍🏻🙏🏼👏🏻
Print the gears with nylon filament, then they should also not melt
can i buy it sir?
0:56 420.69 MPH, Nice
11:15
Вот это моё невезучие место ,когда здесь 140 пролетаешь
You will need to put a shell to get better aerodynamics