Why does it need to be hardened?
Hi Oz,Ulma Doctor, Tq60 thank you guys for your inputs
Ulma Doctor, thank you for sharing this method !! As I never saw that tool before and it may work!!
I put that roller box in my first priority must to buy! It's sounds like a good way to insert it in my 5/8 AxA tool holder
But the only thing I am thinking about is that how to turn the different OD with that tool
It's looks like it designed to do one single cut only! Then adjust to the next OD and so on!!
You probably should be using a travelling steady on that long, skinny piece of shafting because its bound to be deflecting as you traverse. Mic it at various points along the length & map any bowing. Typically its larger diameter in the mid section & smaller diameter near the chuck & tailstock. I've tweaked a couple thou with careful file work but its tedious.
I'm not exactly sure what RC heli shafts are made from. I dabbled with heli's a bit (Mikado Logo 550). I think shaft was 10mm & it was for sure harder, at least on the outside. I don't know a Rockwell number but I could tell with file it was harder than plain steel & very likely higher tensile stock as they see a lot of bending load. But shaft looked precision ground, that I'm quite sure because the bearing fit was the same sliding down the entire length.
I suspect to replicate you would turn it slightly oversize between centers, harden & anneal (hopefully minimal warpage but that's probably wishful thinking & a whole other topic). Then use tool post grinder for last couple thou using same centers. I think the best you could do on lathe is turn the toughest machinable material you can source & lap it to dimension. Lapping is another 'art' but you can make yourself simple dedicated tools like this. http://www.americanlap.com/External Laps.htm
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