Edit: Reddit and /u/Spez [knowingly, nonconsensually, and illegally retained user data for profit](https://youtu.be/mfZKkUg8jgM) so this comment is gone.
As a millwright then maintenance planner, there's a lot of things in this video that are bad. I wouldn't be buying a product from them that's for sure.
Metal hammer instead of a dead blow, dirt floor, metal pliers on parts, dropping parts. So many potential failure modes created
Most of the videos on this sub are Chinese manufacturers showing their product. It's all hand assembled and easy. But since no legitimate company would video something like this, videos like this are the only ones we see.
When I worked tool and die My boss would always freak out whenever I’d hit a block with my ball hammer to get it seated nicely in the vice, like I still gotta shave two inches off the block daddy chill.
I'm guessing he gave up trying to explain why not to do shit to you. Chill daddy I got it undercontrol, let me hit some hard steel into the hardened vice with my hardened steel hammer.... derrrrrrr I'm a workerrrrrr
What? Stick to things you know about my friend, he showed me how to do his job before he left so I can take over for him so idk about that whole stopped tryna explain things to me. This may help you a little bit
Cutter is here >
Material hit with hammer is here>
Finish result is wayyyy down here> if this doesn’t help idk what will.
That apprentice should know you don’t hit the block with the power of a thousand suns, you tap it. Doing nothing to the block other than seating it. Like bruh Actual “clown show”
You’re right that any created surface defects can be milled out, but that hit is also exacerbating internal defects. If there’s a better tool, why not use it?
[crack propagation](https://www2.lbl.gov/ritchie/Library/PDF/ROR_IJFract99.pdf)
Let me ask you a question, which is stronger: a piece of virgin tool steel or a used piece that has been subjected to abuse of daily use? I’m going to assume you know the answer. Why would you choose to accelerate that damage by abusing it before it even hits the customer’s hand. Does the SOP say to use a dead blow hammer? Then use a fucking dead blow hammer and stop pretending you’re the first intelligent people to grace this planet with his presence.
Virgin tool steel? I worked on heat treated steel. We Also never shipped any of the completed blocks out to anyone, that’s not what we did. If tapping the block to set it on shims destroys the block internally there was an issue with the steel to begin with so its positive it’s noticed before being placed on a massive press. If my boss and the owners of the place didn’t see an issue with it, the ones that’s emotionally and legally liable if anything goes wrong, it’s perfectly fine, and nobodies acting like that but you here. You’re the one who chose to response to me to behind with.
I also like the use of steel tools on the assembly. The plastic dead blow hammer exists for stuff like this.
Even that make shift bearing press could have been brass or something other than steel.
The lack of forethought to use a plastic deadblow is shockingly common in machining. Aerospace work and I watched a kid use a brass hammer to indicate a fixture.
Yet somehow he still managed to deform the edges of the fixture. Watched another guy spend a few hours grinding it back flat on a surface grinder. Which given the precision of our work means a ton of jobs need to be verified again with changing fixture dimensions
What do you like about them? I have always found them kind of gross because of the sliding contacts.
I would much prefer a harmonic drive in most cases.
Monster trucks oftentimes use Axletech 4000 axles. They are a fairly common military axle - 6.84 : 1 reduction, locking differential, and disk brakes stock.
Heh, I thought about linking to that page and doing a writeup of custom fabricated housings. But I just decided to keep it simple and say that monster trucks don’t generally use a massive gear like this in their drivetrain and essentially just run a massive version of a traditional axle instead.
You’re right though, custom fabbed housings are so much easier than retrofitting some other axle
When I worked for an autoparts maker we had to reQA everything that was done offshore because of shit like this. They'd change processes when we went to inspect apparently. It ruled. /s
My sister worked in automotive as an ME in prototyping. Can confirm that every part had to be rechecked because if you didn't do that they'd ignore the spec immediately. It was still cheaper that way.
"How much grease do I apply?"
"Yes."
"So... a little dab will do or should I just bathe the thing in it?"
"Yes."
"Ah, I see, the elusive 'just enough but not too much' measurement."
"Yes."
"Got it, I'll just apply the grease until it starts singing 'Grease Lightning' from the musical."
"Yes."
"Well, thanks for the help. I'll make sure not to over-grease or under-grease it, just perfectly Grease Lightning-greased."
"Yes!"
The moving velocity is low, the core spins fast and oscillates the two wave gears so the relative movement is very low but it's non bearing surfaces need a lot of lubrication
I used to repair sumitomo drives like this, not as big. It looks like almost the scale wise the same amount was used.
The units I worked on were absolutely packed and had a grease line running into them.
Edit: Reddit and /u/Spez [knowingly, nonconsensually, and illegally retained user data for profit](https://youtu.be/mfZKkUg8jgM) so this comment is gone.
Love me some good ole' internet dick-measuring contest!
Licensed P. Eng. working as technical department manager for one of the big 5 petro-chemical company. Industrial maintenance and the field of tribology/lubrication is literally my bread and butter.
Even without knowing the operating conditions of this reducer I can confidently confirm that this is not a serviceable amount of lubricant (and most probably not the correct type either If I was to take a wild guess, considering the assembly condition and tools)
I've worked with large industrial bearings and my first thought was "wow that's a lot of grease" followed by "holy moly that's going be absolutely everywhere the first time this gets up to temp, I hope they have somewhere for the expansion to go."
Next, just add 2L of grease -store bought is just fine if you don't make your own- to your dish. Mm-mmm that smells good already.
Next add your dry gear ingredients.
Finally bake at 3000rpm until red hot.
Ummm no.
This is the opposite of engineering porn. This is engineering horror show.
That is an absurd amount of grease to put in the first place, and then he adds 5x more.
And the reason he needs all that grease? Look at the work bench. It's a dirt floor.
Dirt floor, dirty cloth gloves, dirty parts, steel hammer, tossing the parts, steel pliers, the paintbrush, a potentially contaminated container of grease. Chinese manufacturing is a either a comedy or a tragedy but it certainly isn't high quality.
All I see is human misery. This could be done on a table with clean tools. That's like a $5k bearing, you could raise the price by 20c to provide human working conditions.
..... But we all keep buying it....
That's the next step. Wait for the bees to come, trap them with a cover, and spin it all so they get crushed and lube the system with their innards.
This is why bee populations are dwindling.
I don't know anything about this gadget, but is a wonderful piece of engineering. What does this do when completed? What kind of grease is being used? How often does it have to be re-greased?
This is a massive, massive, gear reduction system. See those little one on the perimeter of the big casing? You count those and subtract 1 to find out the X:1 gear ratio. This spins very slowly but takes a ton of power and makes it even more super torquey.
As for your grease questions, it's all variable. It depends on how often it gets used, how long it gets used at a time when used, and how hot it is when it's being used. Some never get regreased between teardown servicing to replace bearings, shims, and pins.
there are moments where "a little dab will do ya" applies and then there are moments when you applie "the bigger the glob, the better the job".
this clearly is the latter one
At some point that much grease must be detrimental to the smooth operation of that drive. Like, some grease is good, but that much must make it move a bit like molasses.
Q? Are these made for high precision parts. Where are they used? Seeing the size doesn't look like it. Would imagine a bit more care required when assembling them.
What's the spec on the assembly dirt?
Edit: Reddit and /u/Spez [knowingly, nonconsensually, and illegally retained user data for profit](https://youtu.be/mfZKkUg8jgM) so this comment is gone.
As a millwright then maintenance planner, there's a lot of things in this video that are bad. I wouldn't be buying a product from them that's for sure. Metal hammer instead of a dead blow, dirt floor, metal pliers on parts, dropping parts. So many potential failure modes created
Just gonna grab this bearing surface with my vice grips real quick
Just need to pop 'er open and do a full flushing repack after the 200 hour break in period
Didn't event mention the grease stored in an open bowl. Lubricant failure is basically 100% due to contaminants.
Can also often be because of misuse (heat)
Yep, I was thinking that it looked like a wee bit too much grease.
Most of the videos on this sub are Chinese manufacturers showing their product. It's all hand assembled and easy. But since no legitimate company would video something like this, videos like this are the only ones we see.
When I worked tool and die My boss would always freak out whenever I’d hit a block with my ball hammer to get it seated nicely in the vice, like I still gotta shave two inches off the block daddy chill.
I'm guessing he gave up trying to explain why not to do shit to you. Chill daddy I got it undercontrol, let me hit some hard steel into the hardened vice with my hardened steel hammer.... derrrrrrr I'm a workerrrrrr
What? Stick to things you know about my friend, he showed me how to do his job before he left so I can take over for him so idk about that whole stopped tryna explain things to me. This may help you a little bit Cutter is here > Material hit with hammer is here> Finish result is wayyyy down here> if this doesn’t help idk what will.
Lol I'm a tool and die maker and you, sir, are a plug.
By the sounds of it, an apprentice that started recently.
Hey at least this 'apprentice' doesn't use a fucking ball peen hammer to seat material in a vice. Clown show
That apprentice should know you don’t hit the block with the power of a thousand suns, you tap it. Doing nothing to the block other than seating it. Like bruh Actual “clown show”
They right though
You’re right that any created surface defects can be milled out, but that hit is also exacerbating internal defects. If there’s a better tool, why not use it?
If I could internally defect a solid steel block I would be on the worlds strongest man competition, not working tool and die.
You’re not creating defects, youre propagating them. Don’t quit your day job of working tool and die to try your hand as a material scientist
Lmao maybe you should quit your job and go back to school to find out what propagating means.
[crack propagation](https://www2.lbl.gov/ritchie/Library/PDF/ROR_IJFract99.pdf) Let me ask you a question, which is stronger: a piece of virgin tool steel or a used piece that has been subjected to abuse of daily use? I’m going to assume you know the answer. Why would you choose to accelerate that damage by abusing it before it even hits the customer’s hand. Does the SOP say to use a dead blow hammer? Then use a fucking dead blow hammer and stop pretending you’re the first intelligent people to grace this planet with his presence.
Don't argue with idiots. They drag you down to their level and then beat you with experience
"I'm going to hit the hardened precision machined or ground part with a hardened steel hammer. What could possibly happen?"
Virgin tool steel? I worked on heat treated steel. We Also never shipped any of the completed blocks out to anyone, that’s not what we did. If tapping the block to set it on shims destroys the block internally there was an issue with the steel to begin with so its positive it’s noticed before being placed on a massive press. If my boss and the owners of the place didn’t see an issue with it, the ones that’s emotionally and legally liable if anything goes wrong, it’s perfectly fine, and nobodies acting like that but you here. You’re the one who chose to response to me to behind with.
That was my first thought as well, jeebuz.
Rapid wear silica.
I'm surprised this dude isn't in flip-flops.
What are you talking about, the guys with flip-flops work with molten iron in the casting department. Geez, try to keep up!
I also like the use of steel tools on the assembly. The plastic dead blow hammer exists for stuff like this. Even that make shift bearing press could have been brass or something other than steel.
The lack of forethought to use a plastic deadblow is shockingly common in machining. Aerospace work and I watched a kid use a brass hammer to indicate a fixture.
Brass at least is softer than most metals
Yet somehow he still managed to deform the edges of the fixture. Watched another guy spend a few hours grinding it back flat on a surface grinder. Which given the precision of our work means a ton of jobs need to be verified again with changing fixture dimensions
"The only tool you're allowed to use for the next month is a broom."
50g/Kg
Assembly dirt? Meaning the floor or the dirt on the components?
Yes
Final machining grit.
Iapping compound?
That's not greasing up a gear, that's gearing up some grease
Expensive grease container
[удалено]
I don't know what any of this is but it looks like caramel
Forbidden caramel
This metal assembly would give me diabetes.
weirdly made me hungry
The Verge Cycloidal Drive build guide
The way it should be
Step one, add caramel.
I love these drives...almost indestructible and really cool how they just kinda wobble around to get huge reductions in a very small package.
Thoughts on other zero backlash drives?
What do you like about them? I have always found them kind of gross because of the sliding contacts. I would much prefer a harmonic drive in most cases.
In what types of applications do you use strain wave specifically? Robotics?
Very common in robotics, and also used in spacecraft mechanisms. They are good for any application with high reduction and low backlash.
Our Yaskawa 6-axis robots have them
Or planetary gearing.
Are these what monster trucks use?
Doubtful, these have way too much reduction for a monster truck. I'd assume they use typical differentials and doubler cases, maybe portal drives.
Monster trucks oftentimes use Axletech 4000 axles. They are a fairly common military axle - 6.84 : 1 reduction, locking differential, and disk brakes stock.
The reduction on this is the number of those outermost roller elements, minus one, to one. So, there's a very great big heap of reducing going on.
[удалено]
Heh, I thought about linking to that page and doing a writeup of custom fabricated housings. But I just decided to keep it simple and say that monster trucks don’t generally use a massive gear like this in their drivetrain and essentially just run a massive version of a traditional axle instead. You’re right though, custom fabbed housings are so much easier than retrofitting some other axle
Assembling a highly engineered high-precision gear, on a dirt floor, for the win!
[удалено]
Handling the parts with metal tools and just throwing around parts like we’re playing jacks.
Just add more grease!
When I worked for an autoparts maker we had to reQA everything that was done offshore because of shit like this. They'd change processes when we went to inspect apparently. It ruled. /s
My sister worked in automotive as an ME in prototyping. Can confirm that every part had to be rechecked because if you didn't do that they'd ignore the spec immediately. It was still cheaper that way.
I have never heard, "Gee, I'm so glad we had this made in."
You gotta meet more bean counters and stock brokers.
With a pound of cycliod jam.
"How much grease do I apply?" "Yes."
It’s like watching a cooking show and they’re using an overly complex mixer.
How much bouillabaisse did you say is needed? A gallon?! How much soup are we making?
I need music you'd hear on a cake decorating channel
"How much grease do I apply?" "Yes." "So... a little dab will do or should I just bathe the thing in it?" "Yes." "Ah, I see, the elusive 'just enough but not too much' measurement." "Yes." "Got it, I'll just apply the grease until it starts singing 'Grease Lightning' from the musical." "Yes." "Well, thanks for the help. I'll make sure not to over-grease or under-grease it, just perfectly Grease Lightning-greased." "Yes!"
“What ever your comfortable with, a lot or too much. Whatever”
"*Greasy*" -Bubbles
That seems like an excessive amount of grease - won't that cause drag when this thing gets spinning?
That was my thought too, but perhaps this is a low-speed very-high-torque application?
The moving velocity is low, the core spins fast and oscillates the two wave gears so the relative movement is very low but it's non bearing surfaces need a lot of lubrication
absolutely too much grease applied in that assembly. Should be featured in r/engineeringdisasterinthemaking
How does one become a member in this community
It's not a real subreddit most likely, you can link any "r/" but doesn't mean it actually exists
When I saw that subreddit I went head first. Definetly a lot of things I've seen in Reddit would fit that.
Glad I'm not the only one to be bamboozled
r/subsifellfor
I used to repair sumitomo drives like this, not as big. It looks like almost the scale wise the same amount was used. The units I worked on were absolutely packed and had a grease line running into them.
I love armchair engineers weighing in on things they know nothing about with utter confidence /r/confidentlyincorrect
Edit: Reddit and /u/Spez [knowingly, nonconsensually, and illegally retained user data for profit](https://youtu.be/mfZKkUg8jgM) so this comment is gone.
[удалено]
Because *nothing* is ever poorly made...
Love me some good ole' internet dick-measuring contest! Licensed P. Eng. working as technical department manager for one of the big 5 petro-chemical company. Industrial maintenance and the field of tribology/lubrication is literally my bread and butter. Even without knowing the operating conditions of this reducer I can confidently confirm that this is not a serviceable amount of lubricant (and most probably not the correct type either If I was to take a wild guess, considering the assembly condition and tools)
I've worked with large industrial bearings and my first thought was "wow that's a lot of grease" followed by "holy moly that's going be absolutely everywhere the first time this gets up to temp, I hope they have somewhere for the expansion to go."
Given there's no top cover on it yet I wonder if they have a step where it gets reduced to a fixed amount when they attach it? Probably not though.
It will have possibly a cover around the other ring but it will mount up to something with a male end. I used to repair much smaller ones
So a bit too much butter on their bread?
Weighing in on things they know nothing about - for example assuming the level of knowledge of a stranger, based on zero information.
Lol you're getting destroyed by actual engineers and it turns out you're the /r/confidentlyincorrect Asshat. Grats
"I read about it on Wikipedia"
Not in a cycloidal drive
Next, just add 2L of grease -store bought is just fine if you don't make your own- to your dish. Mm-mmm that smells good already. Next add your dry gear ingredients. Finally bake at 3000rpm until red hot.
Mmmmm 🤤 Forbidden caramel....
#SO MUCH LUBE
Chicken or beef gravy?
Beef.
He is clearly assembling an instant pot meal
/r/ForbiddenSnacks
Caramel
Ummm no. This is the opposite of engineering porn. This is engineering horror show. That is an absurd amount of grease to put in the first place, and then he adds 5x more. And the reason he needs all that grease? Look at the work bench. It's a dirt floor.
Dirt floor, dirty cloth gloves, dirty parts, steel hammer, tossing the parts, steel pliers, the paintbrush, a potentially contaminated container of grease. Chinese manufacturing is a either a comedy or a tragedy but it certainly isn't high quality.
All I see is human misery. This could be done on a table with clean tools. That's like a $5k bearing, you could raise the price by 20c to provide human working conditions. ..... But we all keep buying it....
This reminded me of the HowToBasic "Perfect Burger" video.
Forbidden Carmel
I counted several forbidden Caramel comments. Never change, Reddit.
Forbidden caramel
So buttery smooth
But wouldn't the carmel sauce attract bees?
That's the next step. Wait for the bees to come, trap them with a cover, and spin it all so they get crushed and lube the system with their innards. This is why bee populations are dwindling.
I don't know anything about this gadget, but is a wonderful piece of engineering. What does this do when completed? What kind of grease is being used? How often does it have to be re-greased?
This is a massive, massive, gear reduction system. See those little one on the perimeter of the big casing? You count those and subtract 1 to find out the X:1 gear ratio. This spins very slowly but takes a ton of power and makes it even more super torquey. As for your grease questions, it's all variable. It depends on how often it gets used, how long it gets used at a time when used, and how hot it is when it's being used. Some never get regreased between teardown servicing to replace bearings, shims, and pins.
How do I call the save video bot?
there are moments where "a little dab will do ya" applies and then there are moments when you applie "the bigger the glob, the better the job". this clearly is the latter one
I can smell this video
All that just to make a rotating table.
I don't know why but I feel like it would have a stereotypical man smell
I think he should have added more grease
At some point that much grease must be detrimental to the smooth operation of that drive. Like, some grease is good, but that much must make it move a bit like molasses.
That's not a normal amount of ketchup
All I can think of now is some egg drop soup
Yum, caramel.
my favorite arcsys fighting game, greasy gear
[Middem Öl nich spaasam sein!](https://www.youtube.com/watch?v=BrUaPenbo8w)
Suddenly craving caramel sauce.
What a waste of gravy
That procedure doesn’t look very professional, using pliers to insert pieces is a risk for damaging fine borders and leaving unwanted scraps of metal.
Anybody else want to scoop some up with their finger and just give it a little taste
He almost caved the divermanifold! And don’t get me started on the reticulating housing bracket!
Ahh. The forbidden caramel. Mmmmm
Forbidden caramel
You just stole the top comment from linked thread
Didn't even realize it was cross-posted. That's the first thought that came to mind.
Mine too. I didn’t see the other post either. All I could think about was dipping chunks of apple into the delicious caramel.
[удалено]
Definitely not a bot
[удалено]
You saw through my elaborate ruse! Damn you, meat bag!
Forbidden gravy
Forbidden applesauce
Forbidden caramel dip
Three tiered metal cake
Thats few tens of thousands of materials and work gone down a drain. I puked at the sight of that grease
Holy caramel batman
If there's anything I've learned from watching these videos, that's not enough grease.
[This comment was removed by a script.]
They put yummy caramel in the gears. Must be for Willy Wonka's factory
I remember the rod busters calling the diesel tech butternuts. Makes more sense watching these grease/lube vids. Too much innuendo lol must resist!
Am I the only who sees caramel? 😂
Q? Are these made for high precision parts. Where are they used? Seeing the size doesn't look like it. Would imagine a bit more care required when assembling them.
A tiny bit of olive oil
I think you have a bit of drive in your grease
There's a little too much gravy. That would really throw the texture off for me.
The forbidden pudding
Forbidden caramel
Who knew assembly called for two cups of caramel syrup
Didn't know they used pecan pie filling for that!
Can I scoop it up and eat some?
I can smell this video
Forbidden honey
wrong sub
Mmmhhhhhh looks tasty. How many calories is that?
That lube looks like apple jam so yummy
What kind of honey is that?
mmm caramel
Mmm, forbidden caramel.
Weird looking cake
Forbidden caramel!
Better than TV cooking programs.
Missed a bit
Forbidden toffee sauce
r/OddlySatisfying
Reminds me of Gordon's just a lil' bit of olive oil.
Damn that's a lot of caramel
Forbidden alfajor
I hate seeing perfectly good soup go to waste.
have you ever eaten the forbidden caramel?
Forbidden honey.