To harden gears, I thought you were suppose to heat it up and drop it into oil..

you need carbon to harden steel...

You heat it up until it is red and non magnetic (going to have to check) then clench it in oil. then heat it back up and clench in water.

Using just water DOES case harden but not as well as added carbon.


See here
http://www.technologystudent.com/equip1/heat2.htm

where would i get this type of carbon?

i think i am just gonna leave this to a professional shop to do but just curious.

is the hardening process what gives it that black coating? cuz that i show my other mod1.5 gears are.

Quench it in used motor oil.

he is correct ^ :)

Do I win a prize? :lol:

Does a poke in the eye with a sharp stick sound OK?

ignore this post. it's not really here.

have it done properly. after that you can be sure that it works. It took you some efford to get the right gear, so it's worth to take it to the shop.

the steel has to have at least 0,2-0,3% carbon to get hardened like that. It's a process on (at least) the surface of the material, it doesn't get the carbon from the oil, you can also take water (wich needs additives due to the boiling).

afterwards it needs "annealing" or tempering, that's what you usually do after hardening, the surface is just too hard and like glass. annealing makes it kinda "flexible". that's what they do with alloy after welding to get rid of tensions. eg. cannondale (bicycles) do it like that.

That's the usual process when hardening knives; when you miss out on annealing, the knive breaks like glass.

thanks for the tips. i am gonna have it done at a shop cuz my torch wont even get the gear red. or even discolor it at all. needs to be much hotter than propane flame.


anyway,
i have been busy modding my car but my camera is having issues so i cant take pics. as soon as i get it fixed or get new one i will post lots of pics.

put on baja 5b shocks on the rear so far. the difference is night and day. waaay better than the rampage shocks and have 6mm shaft so no bends or breaks will happen.

installed aluminum spindle carriers.

heat tempered diff outdrives. (something i learned from the rampage forum to increase their strength)

modded front bumper to look more like a truggy bumper

a few other minor things. today i have a ton of parts arriving. i think my 4 wheel disc brakes get here today. i hope so.

my speed control gets here mid next week and motor mount and spur gear should be ready about then also.

i am really trying to build this thing to drive as much like a 1/8 truggy as possible. i dont want a huge sluggish monster truck. i am installing sway bars and also droop limiters. both of these will have to be custom made but will help the handling a ton i think. without the droop limiting this thing sits so high and will handle poorly. i want to get it so it sits pretty low to the ground for improved handling.

:lol:

got my integy disc brake kit today. they actually look surprisingly very nice and quality. and the best part- i think they will work! so i am working on getting them setup now. i only got the fronts today though so the rears come tomorrow. i will post pics when i get them mounted up.

You guys need to check with a blacksmithing board or some one that does this for a living or has done this many times. When I was modifying my Ruger 10/22 Trigger assembly 2 parts had to be annealed (for adding setscrews) and then hardened again. My disconnector was perfect, but the sear edge of the hammer was too soft and I went through 3 hammers until I got it right. You need to use a Oxy/Acet torch to get a part like that hot enough. There is a chemical that is a powder that surface hardens steel parts, but I can’t remember what it is called right now. I’ll look into it, but basically it case hardens the outside of the gear. You heat up to a certain temp and dip it into the powder and allow it to cool. That way the outside of the teeth are hard, but the center of the tooth is softer so it doesn’t shatter.

Jeff

There's a few places that sell the alloy arms for em, just google "multiplex digi 4 arm"

It's a little bigger than my std sized servos.

As for spline, I'm using one of the arms that came with the baja kit. It says "Hi 8mm" on it. So Hitec I guess. Only problem is, the baja comes with a few arms

F 25
Hi 24
KO 23
Hi 8mm

So not sure what the tooth count is lol.

at first i bought the futaba s5050 for steering servo but i just traded it in for the HPI SFL 30MG digi servo so that i had the 8mm spline and could use the massive HPI servo arm.