Starting with turbos vs superchargers?

In my design, I never talk about it but I made it in a way "IF" the shaft break loose on the shaft of the Emotor, nothing else will fly away. Imagine your shaft "IF" the set screw get loose, the impeller will probably totch the compressor housing, the impeller will shatter, broke you real turbo and you know the end. So think about the worst how you can prevent all the part from moving in the worst casse
 
^^That's good advice. The other thing is that apparently, at least in supercharger world, the shafts are made from some really tough alloy. Now, I don't know why exactly - WB would have better insight, him being a machinist - it could be because of the side loading from the internal step up or something else, I'm not sure.
 
Well I don't have the answer for this. An engineer could gave more infos. I've made my shaft out of "drill rod". That's a tough alloy. BUT the real shaft don't look that tough anyway. It don't look to have a super hard heat treat. The shaft on real turbo is grind with precision. And to be grind, they need to be at least a little hard. So maybe you don't need to get a super strong and heat treat allow but take something machine able but still really strong.
Maybe the super hard heat treat shaft is more brittle, less "elastic" and more prone to snap?

That's a cool topic if you want to learn something new! The doloreane doors have a unic spring mechanisme of a cryogenic treat metal bar.
 
I first want to heat treat my shaft but the shaft will loose all his précision. Maybe cryogenic treatment is the way to go
 
Lol - That guy uses the same propane tanks, lens wipes and has the same light I do. That is one of the best videos on cryotreatment I've seen. Thanks for posting that. It seems like everyone outside the US talks of "drill rod" or "silver steel;" in the US we just call it tool steel.

The Vortech impeller shaft is HARD - no drill bits I own would even touch it. And the impeller shaft does look ground. I had to buy a 5.2mm solid carbide drill bit to drill it. The carbide cut right through it, though. But I did throw down for a good, US-made carbide bit (my other drills are pretty good quality, too, but think more DeWalt, Irwin, Craftsman (back when it was still US made), etc.) Tapping it was not a fun process and took forever.

Somewhere in my travels I remember being told that the impeller shafts are what usually holds up Vortech production. They have to be very hard and very precise, apparently.

That said, I don't know if the hardness/toughness is as important for us - and I don't know how hard the P2 impeller shaft is, though I have a feeling it's not as hard/tough as the Vortech unit. In our cases, we're not spinning the same RPM, we don't have the shock loads that at least a supercharger sees (like on shifts, tire shake, etc), and we certainly don't the temperature ranges a turbo sees.

WB - so I assume you just turned your shaft with regular carbide insert tooling? Honestly, I've never tried to machine tool steel (at least intentionally). But I'm not sure I'm feeling the belt drive on the P2 setup - the heat generated by the belt is pretty intense; I may end up just direct driving that one too.
 
Here in Quebec we miss call everything in anything 😂 so maybe the "drill rod" is just an other miss call. Yes it's hard and can be heat treat but not a super hard heat treat! It's not super hard to machine! Its not like a 50+ rockwell.
 
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