Someone ordered some custom gears from Stefan? 😎

[moon]

This should be a good video

[rey8801]

Yeh being following him for while. In the field Stefan is one of the few that can actually teach about machining.

How do you find steel on steel for gears?

[seaborder]

Sorri for the late reply I was a bit off the forum the last days

The gears are nice, steel on steel is quite loud but somehow I like the sound. I first was a bit concernd of heat but it seems to be alright!

There are some things I want to change for the next version but Iam not sure atm how and when.

Things Iam thinking about is:

Switch to helical (expensive, hard to get produced and not that strong as straight teeth. But its not that loud and runs a bit smother)

Thinner teeths maybe from 15mm to 10mm wide.

All stuff Iam thinking about atm. But yeah I will need to test some more before.

Here is a little video of the sound - The teeths still will need some more KMs to “run in” for a even nicer run.

[rey8801]

No problem!
yeh for sure steel and not metal gear helps, but then you have to source the right plastic. I have tried Nylon and POM (Delrin) and the second seems to do better but not sure what actually is used in high level, high load gear.
For a montain board I wouldn’t care about the sounds and more about the strenght of the gears so spur gears si for sure a plus.
Nice that steel on steel is fine. That would be my option but read that you better run them in oil or they wear out fast. Based on where you read there are different info. A bit confusing

[AngryTrucker]

Is there any type of grease recommended for metal on metal gears? I’m using standard white lithium and it’s getting a bit toasty

[rey8801]

what gear to you have steel on steel. Not may out there except Trampa I think.
I would think you need an high temp, high load grease. Pretty dense that softs when temperature rises , but I ma not a grease expert.

[AngryTrucker]

Using the spiral bevel gear drive

Spiral Bevel Gears Drive

Hi everyone, my name is Morris. I’m from Taiwan.My English is poor. The final version open pre-order. If you are interested, fill out the Google Form. The Gears Drive Kit (one gearbox) is priced at 160usd + shipping Would take around 4~5 wks to make. Recently I made a gearbox that uses spiral bevel gears to drive it It is suitable for installing on Trucks of Calibre II and TorqueBoards and is compatible with 50XX or 63XX motors (8mm shaft) with ABEC wheel over 83mm At first I used POM to…

noticing the gearbox getting hotter than my motors… definitely have to get something heavier I think

[seaborder]

yeah thats true. Time will show

for grease ive just took normal longtime grease, seems to work fine but there is something better for sure.

Oil would be crazy but I dont see any way to get this working 100% right for the emtb so we just have to test with grease

I will keep you updated how it goes

[Creavenger]

I saw Stefan’s videon awesome project dude! Cool that someone is testing some proper steel on steel gears. Do you have a link to the stock gears you bought? Stefan mentions they are commercially available.

[taz]

@seaborder

Switch to helical (expensive, hard to get produced and not that strong as straight teeth. But its not that loud and runs a bit smother)

Theoretically helical gears are stronger than straight when all other parameters are the same.

[seaborder]

iam not sure here. From what I know straight is a bit more stronger. Racecars also use straight because of that reason. But iam not 100% sure. For esk8 helical is strong enough for sure

@Creavenger I was checking the supplier site but I cant find the EXACT gear anymore. I will check for that later!

[taz]

There are various parameters when designing a gearbox such as axial thrust etc.
We simplify by saying this is stronger than that etc.
When talking gears we essentially make 2 different calculations/checks gear/pinion bending and gear/pinion wear.

[rey8801]

For sure spur gear is stronger than helical but in race car they use it because of cost. They replace it every few competitions so reason to complicate life with helical. Otherwise they will be fine as well

[taz]

@rey8801

For sure spur gear is stronger than helical

Do you mean the other way around?

[ptowncruiser]

My understanding is that helical gears are stronger than straight cut gears. Race cars use straight cut gears because they don’t generate an axial load. If your gears generate an axial load then you need a gearbox that is designed to handle the extra load. Since race cars generate tons of torque, this would mean a lot of axial load and therefore a lot heavier gearbox. Obviously they want to make the cars as light as possible, therefore spur gears.

[rey8801]

yeh helical stronger than spur. That based on my understanding. but in race applications you change the gears faster than they wear out so who cares.

[seaborder]

yes learned something again

[rey8801]

but spur is plenty for esk8, hleical is more sound nad I guess smoother riding. For the rest it will increase price and complicate things. That being said I ma usign herringbone whihc is double side helical so double problems in machining, I guess I talk for frustation

[Creavenger]

Thanks! you can also tell me the supplier site, im interested to see what they got.

[seaborder]

take a look at https://www.maedler.de/ they have a bunch of different stuff