brushless 1/5 4wd conversion about to begin! couple questions. - RC-Monster Forums

Jabe · 07.15.2009, 04:17 PM

You realy need to get it hardened... its very easy to do if you have blowtorch, just heat it untill it starts to go from red to white then drop it in cold water and thats it.
You might want that spur last longer than pinion, so it should be hardened.
I have hardened HotRacing pinions and those last just long as other hardened.

Ryu James · 07.16.2009, 02:13 AM

Quote:

Originally Posted by Jabe

You realy need to get it hardened... its very easy to do if you have blowtorch, just heat it untill it starts to go from red to white then drop it in cold water and thats it.
You might want that spur last longer than pinion, so it should be hardened.
I have hardened HotRacing pinions and those last just long as other hardened.

i dont think i have a torch that would turn this gear red. what kind of gas?

brushlessboy16 · 07.16.2009, 12:22 PM

Quote:

Originally Posted by Ryu James

i dont think i have a torch that would turn this gear red. what kind of gas?

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

Ryu James · 07.16.2009, 01:41 PM

Quote:

Originally Posted by brushlessboy16

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.

KaztheMinotaur · 07.16.2009, 05:42 PM

Quench it in used motor oil.

brushlessboy16 · 07.16.2009, 07:20 PM

Quote:

Originally Posted by KaztheMinotaur

Quench it in used motor oil.

he is correct ^ :)

KaztheMinotaur · 07.16.2009, 08:23 PM

Do I win a prize?

florianz · 07.17.2009, 04:53 AM

Quote:

Originally Posted by Ryu James

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.

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.

Ryu James · 07.17.2009, 08:57 AM

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.