My gears look different to the ones in your photo; they have a surface finish that couldn't have come from any milling or turning method I know of and they were definitely hard all the way thru. Your gears would probably benefit from the carbide drills as well; I had the lathe set for 200 rpm and used a slow feed as I don't have and data for working sintered steel with carbide. The gears only got slightly warm.
Originally they looked like this:Originally Posted by overkill
HPI gear.jpg
I couldn't drill through it at that stage so I turned it on a lathe and cut a new face, that took the hardened piece off and I could just about drill it.
What type of drills did you get Nick, there are loads of different shapes carbide drills around! What worked for you?
Ah, now your gear looks exactly like mine. I used drills like this: http://www.mcmaster.com/#standard-drill-bits/=ql6bw5 and I am sure you can find the same thing locally in the UK or Europe. I tried facing one of these gears and only succeeded in ruining a carbide insert.
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