Hardening the Steel Gears for the - Home Made 6 Speed Electric Dirt Bike - Part 3 

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The way he's doing it is hardening the face or surface of the metal, he's not introducing carbon into the entire structure of the steel. Think of this process as similar to anodizing aluminum. It increases the durability of the part's contact area's but it won't increase the strength of the steel in whole. This process is highly recommended over using a high-carbon steel for the entire part when used in things like transmissions or final drives.

Well, what he never said was: THIS is how to harden THIS ALLOY of steel, other kinds of steel would have taken longer or shorter, or worked better with the water, etc, ALL STEEL ALLOYS ARE DIFFERENT, so don't just copy him with whatever you have and try to do an hour and 20 mins and then use Cooking oil

carbon baked gears, my favourite

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Tbh the best cooking show on RU-vid.

Let him cook hahaha

Yeah. Too many people take themselves way too seriously these days. When folks can't even bare to be the butt of their own jokes, they can rarely cope with being the butt of other peoples.

lol he needs to show them more often 😂

Ohhh they were , sober & still lmao

Think he started talking backwards there for a few seconds

This is proof , Chris is one of us . He does great work & doesn't give up . Much respect !!!!!

* yeah incredibly stupid

You didn't mention the quenching step

@testdevice989 in my tool and die job we put the part in a stainless steel envelope that we folded from sheet we put in a small piece of wood to burn off the oxygen, 2000 degrees for 3o minutes per inch, then cool down, put back at 400 for an hour or so to draw back any brittleness, no quenching.

2000 Fahrenheit for heat treating hss. Most air hardening steels like a2, s7, h13 is more like 1750. Oil hardened steel more like 1650 .

Yup, just put them in an oven at about 425f for an hour. Let them cool on their own.

I thought about tempering them but some of the videos I watched said you don’t need to, so I didn’t. Hopefully I won’t regret that decision

@@ratherBweldingChrisI am mostly familiar with hardening for knife making, which is a bit different than case hardening for gears. Looking around a bit it appears that the hard skin on a tough center brings special properties that are useful in gears, so it may be that tempering isn't needed for this specific use case. It is lots of fun seeing you learn new skills for these projects. I have been watching since the lathe build days and am constantly impressed with your skills and mind for engineering.

Not knocking on your machining skills at all. I’m actually very impressed at the level you take your builds to, and the growth you’ve had in machining.

You would really benefit from getting a machinist handbook.