Official Erevo 1/8 scale center diff thread

[mistercrash]

I don't use cutting oil when I make the holes in the spur with a carbide bit. I don't let the bit get warm and the metal is relatively thin. I would use cutting oil with cobalt bits. I used cutting oil when I made the threads, it's more like a wax. Something like this.

http://www.fastenal.com/web/products...3126544&ucst=t

[simplechamp]

I posted on a CNC machining forum yesterday to get a bit more advice. People recommended trying to do some spot annealling by taking a butane and/or propane torch and heating the cap for 10-15 min. (blue point of flame directly on area to be drilled) and then letting it cool to room temp. They said it should be a bluish tint after the process and that should mean the steel has softened up a little.

I'm going to try that. Then, I'll try the cobalt bits with the cutting fluid. If that doesn't provide any results I'll move on to the carbide bit.

The place I ordered the bits/tap from actually had a free upgrade to next day shipping. I left a note for the UPS guy to leave the stuff at the door. Hopefully they won't need anyone to sign for it, but I'm not sure since it's next day service. I really would like to be able to finish this project over the weekend so there better be a package waiting for me when I get home!