Hi Engineering After Hours, around the 1:22 mark you said that the bearing hubs prevent the motors and transmission from seeing vibrations and impact loads. How does that work? When you explained your bearing hubs later on towards the end at 11:25, the bearing hubs didn't seem to contain anything that would eat up the extra shock/movement like a suspension. I did see some universal-joint looking things connected to the belt drive, is that what's eating up the unwanted movement and other loads?
Yes, the double universal joints keep the major wheels loads off the transmission. I have them straight but they can articulate a lot. In reality the chassis will flex a little so the joints have to compensate for that. The wheels also absorb a ton of the impact.
Most of the designs out there basically bolt the wheels directly to the gear motor shaft. Because of the speeds this thing is capable of...I need a more rugged solution.
Hey man it's a great project but can u guide me as to how you went about designing the driving shaft and the other transmission components like bearing hubs etc. It would be a great help.
i really need to know what the wheels you are using!! please :) Let me know ;) my robot isn't as bullet proof as yours, but the wheels would be much ideal for my robot
@@EngineeringAfterHours NICE, how much does your robot weigh?? i kinda forgot without wathcing the whole video again, im using cordless drills 4 set, very heave about 8Kg (its not as big as yours though) Thank you for the wheels! i've had to go with some metal bead locking ones, but the tyres you got there are perfect!, the ones im using are super spongy and the battery drains quickly due to the LARGE drag factor so you have any tips on making the inner tyre firm? Again thank you for responding! your robotics is a much more effient machine than mine is, but i dont have a laser cutter like you do, nor the tools NOT the money! LOL but thank you again
I dont recall everything but what I seem to recall is: Wheels were purely a function of largest diameter for the price. It's pretty easy for me to custom design for wheel load and even design my own wheels if needed. The main math I actually did on this design was for the belt drive to know what my slip torque is. It's why I had 2 belt drive systems laying around. I had also done some simple structural stuff to ensure deflection in the drive train was reasonable. But for the most part it was just way over designed for any load case I have.
@EngineeringAfterHours Do you recommend me a certain type of motors ? which is better 24v or 12v motors ? Also, do you recommend me starting my first build with a suspension system or just mount the motors directly to the chassis ?
Skid steering won't work well with just 2 wheels. It pushes the moment center towards just the driven wheels. 4wd also wins offroad...especially in snow or wet conditions.
In this example I had quoted xometey as well as a few others and fictiv came in at a more cost effective price point. I just didnt cover all the different companies in this video that were higher priced for the sake of duration and flow.
I can't imagine they will perform well with higher speed setups like a 1/8th 4-6s. I would expect a lot of balooning but I never actually tried it on a bigger setup
Half the wheels are driven with a belt. The 2 main drive wheels are coupled with a double universal joint. I dont believe there is a pully that will fit with the transmission I have to use a double pulley setup instead of the universal drives. If there is a pulley that small it'll be torque limited due to limited tooth engagement and diameter. So the universal joint is a more compact and higher performing design in this packaging.
Fun video. I'd like to see more of the build, design engineering and less driving around. The testing is fun but for an engineering channel a lot of the explanation of how and why it works seemed to be lacking for me.
I wish I could include much more of that but if I did youtube would bury it and you wouldn't have even seen the video. My channel started out with heavy emphasis on straight technical content, then switched to project based technical content. Even with project based content, 95% of viewers complained about or skipped through the good technical details. Now I focus on the high level principles and the overall "thing" I'm making. At some point when I grow this channel enough, I want to start a second channel for the detailed technical content. If I left it all in now...the channel just wouldn't grow.
Yeah the problem with omni wheels is that they're going to perform very poorly offroad compared to these and that was my biggest use case. If this were an indoors or warehouse robot...they would do well.
Omni wheels perform very poorly offroad. You could do a swerve drive concept where each wheel can turn a full 180 degrees, but those are typically way too bulky and complex to be reliable for extreme conditions like this.
@@EngineeringAfterHours yea titles are hard to make, but I'm surprised you haven't blown up yet on youtube because your vids are so well made and high quality
Its amazing to me that this channel only has 3.5k subscribers with videos this slick. The algorithm owes you an apology.
Hah...thanks for the kind words...here's to hoping the algorithm gives me some help this year!
Thanks for shareing. Nice to see ,after designing and building, the testing of all worse case senario's. IMPRESSIVE.!!
Thanks for your sharing. Can you share the electric diagrams and the TX - RX you used
This guy's build was perfectly timed
You're not kidding. I was especially lucky with the snow.
Hi Engineering After Hours, around the 1:22 mark you said that the bearing hubs prevent the motors and transmission from seeing vibrations and impact loads. How does that work? When you explained your bearing hubs later on towards the end at 11:25, the bearing hubs didn't seem to contain anything that would eat up the extra shock/movement like a suspension. I did see some universal-joint looking things connected to the belt drive, is that what's eating up the unwanted movement and other loads?
Yes, the double universal joints keep the major wheels loads off the transmission. I have them straight but they can articulate a lot.
In reality the chassis will flex a little so the joints have to compensate for that. The wheels also absorb a ton of the impact.
Most of the designs out there basically bolt the wheels directly to the gear motor shaft. Because of the speeds this thing is capable of...I need a more rugged solution.
@@EngineeringAfterHours OK, that's pretty cool! Did the wheels and joint replace a suspension then?
Yes. A "traditional" suspension on this design would be pretty complex but more importantly take a lot of space.
It's a great design and it came out great on the first try. Too bad we can't buy some parts as they are custom made.
Now I want to build one!! Lol. Where can I find the pulley and belts??
Hey man it's a great project but can u guide me as to how you went about designing the driving shaft and the other transmission components like bearing hubs etc. It would be a great help.
Great Video! Are u available for a Q&A re: skid steering (high torque and low speed)?
Possibly. How much info are you looking for?
@@EngineeringAfterHours I can email u...pls let me know ur id...and u can decide if we need a call.
I would love one of these. I started making something similar with hoverboard motors but that's hard to control
Add Pro-Line Hyrax 2.2 and lengthen the wheelbase by about 6 inches....it’ll probably climb stairs with that setup and be more stable at high speed.
i really need to know what the wheels you are using!! please :) Let me know ;) my robot isn't as bullet proof as yours, but the wheels would be much ideal for my robot
www.amazon.com/gp/aw/d/B075C34QBD?psc=1&ref=ppx_pop_mob_b_asin_title
@@EngineeringAfterHours NICE, how much does your robot weigh?? i kinda forgot without wathcing the whole video again, im using cordless drills 4 set, very heave about 8Kg (its not as big as yours though) Thank you for the wheels! i've had to go with some metal bead locking ones, but the tyres you got there are perfect!, the ones im using are super spongy and the battery drains quickly due to the LARGE drag factor so you have any tips on making the inner tyre firm?
Again thank you for responding! your robotics is a much more effient machine than mine is, but i dont have a laser cutter like you do, nor the tools NOT the money! LOL but thank you again
Could you please provide links to the parts? Motors, gears, etc...?
Thank you, Sir
Great work. I would like to ask what kind of math you have done to specify wheels size and chassis dimensions and pay load?
I dont recall everything but what I seem to recall is:
Wheels were purely a function of largest diameter for the price. It's pretty easy for me to custom design for wheel load and even design my own wheels if needed.
The main math I actually did on this design was for the belt drive to know what my slip torque is. It's why I had 2 belt drive systems laying around.
I had also done some simple structural stuff to ensure deflection in the drive train was reasonable.
But for the most part it was just way over designed for any load case I have.
Is a suspension system a necessity in these robots ?
Depends on use case. These don't have a true suspension but my next robot will have some articulation for traction
@EngineeringAfterHours Do you recommend me a certain type of motors ? which is better 24v or 12v motors ?
Also, do you recommend me starting my first build with a suspension system or just mount the motors directly to the chassis ?
How much to buy
What's the advantage of driving all four wheels instead of just two? More traction?
Skid steering won't work well with just 2 wheels. It pushes the moment center towards just the driven wheels.
4wd also wins offroad...especially in snow or wet conditions.
Found you true Shane's discord group, glad i check you out. Nice video, thanks for sharing
Thanks...Shane is the GOAT when it comes to robotics!
@ToRe Cool, can you link me to Shane’s Discord?
Can I buy one from you?
Would you do a fictiv vs xometry vid?
In this example I had quoted xometey as well as a few others and fictiv came in at a more cost effective price point. I just didnt cover all the different companies in this video that were higher priced for the sake of duration and flow.
What size wheels/tires are those? Nice build, I like!
www.amazon.com/gp/aw/d/B075C34QBD?psc=1&ref=ppx_pop_mob_b_asin_title
I can't imagine they will perform well with higher speed setups like a 1/8th 4-6s. I would expect a lot of balooning but I never actually tried it on a bigger setup
so why not drive the wheels with the belt?
Half the wheels are driven with a belt. The 2 main drive wheels are coupled with a double universal joint.
I dont believe there is a pully that will fit with the transmission I have to use a double pulley setup instead of the universal drives. If there is a pulley that small it'll be torque limited due to limited tooth engagement and diameter.
So the universal joint is a more compact and higher performing design in this packaging.
Fun video. I'd like to see more of the build, design engineering and less driving around. The testing is fun but for an engineering channel a lot of the explanation of how and why it works seemed to be lacking for me.
I wish I could include much more of that but if I did youtube would bury it and you wouldn't have even seen the video. My channel started out with heavy emphasis on straight technical content, then switched to project based technical content. Even with project based content, 95% of viewers complained about or skipped through the good technical details.
Now I focus on the high level principles and the overall "thing" I'm making. At some point when I grow this channel enough, I want to start a second channel for the detailed technical content. If I left it all in now...the channel just wouldn't grow.
I think the only downside of not having a motor for each wheel is that it cant go sideways.
Yeah the problem with omni wheels is that they're going to perform very poorly offroad compared to these and that was my biggest use case. If this were an indoors or warehouse robot...they would do well.
Omni wheels perform very poorly offroad. You could do a swerve drive concept where each wheel can turn a full 180 degrees, but those are typically way too bulky and complex to be reliable for extreme conditions like this.
The title of the video sounds like a product post on some shopping website
Titles are always so hard to decide on
"Homemade Sherp Style 4 Wheel Drive Robot Chassis 2021 New Style Tank 4WD Race Car Cyberpunk Kit AWD Skid Steer Hoverboard"
@@EngineeringAfterHours yea titles are hard to make, but I'm surprised you haven't blown up yet on youtube because your vids are so well made and high quality
I would have that pushing my mower around the yard.
I definitwlt want to make some good lawncare attachments for my rc builds. This was one of the things I envisioned with the robot chassis.
can i get dimention for the robot ? can you share your mail id ?
TBH i thought you had no shirt for a sec lmao
found u on reddit
We've been waiting for you
I did on Hackaday.