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Post by jetjeff on Apr 1, 2017 15:07:13 GMT -5
Hi Alain,
Very nice work. There are turbochargers and superchargers that turn counterclockwise, as viewed from the front, but they are not the 'norm'.
Regards
Jeff
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Post by jetjeff on Apr 1, 2017 17:24:42 GMT -5
Hi Alain,
Does heat treating distort the shaft?
Regards
Jeff
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CH3NO2
Senior Member
Joined: March 2017
Posts: 455
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Post by CH3NO2 on Apr 1, 2017 20:20:05 GMT -5
Jaw dropping.
There are some seriously talented people in this forum.
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gtbph
Veteran Member
Joined: August 2013
Posts: 101
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Post by gtbph on Apr 2, 2017 9:46:30 GMT -5
Thanks Tony!
Hi Jeff,
Thanks! I'm just very curious how using this direction of rotation became the norm, because I can't find any reason.
No, there was no distortion, at least none that I could measure. It is said to shrink by about 0.05% when hardened, so for example my bearing seat of 10 mm shrunk by 5 micrometers. This was no problem because I left it about 20 micrometers oversized. Precipitation hardening is much less dramatic than heating and quenching carbon steel where ferrite transforms to austenite and then to martensite. 17-4 PH is already martensite in the annealed condition, hardening only "welds" the martensite crystals together. But 17-4 PH does not get as hard as carbon steel.
I really love this steel, I find it easier to machine than the "normal" stainless steel (304), especially on the mill, because it does not work-harden too much. But it generates a lot of heat when machined.
Regards, Alain
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Post by jetjeff on Apr 2, 2017 11:13:00 GMT -5
Hi Alain,
347 stainless generates a lot of heat when machining too. I use tap magic as a cutting fluid when milling and chips leaving the work piece leave a smoke trail behind it!!
Counter clockwise rotating turbocharger wheels use right hand threads to secure the turbo. It might be easier for car manufacturers to use clockwise spinning turbo for easier installation. The Ford Powerstroke 7.3 liter dieselsused both clockwise and counterclockwise turbo, depends on the year.
Regards
Jeff
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gtbph
Veteran Member
Joined: August 2013
Posts: 101
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Post by gtbph on Apr 2, 2017 12:45:13 GMT -5
Oh yes, I completely forgot the snail housings which also curl in different directions! Sometimes I'm just stupid. I always only thought about the rotor. Thanks for solving that mystery for me. Yes I've seen such smoke trails too, they looked quite interesting! If you have seen my video about milling the wheel, there is a large cooling oil nozzle, and there is still a bit of smoke. First I used a smaller nozzle, this made a lot of smoke. On the lathe I prefer not to use any oil at all because of the smoke, the chips get blue sometimes but the carbide tips can take it.
Regards, Alain
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