Has anyone come across diy centrifugal blowers built from old turbo compressor wheel, shaft and housings?

Two lots of ~1:4 gearing and you're about right around 1:16. Maybe salvage the gears from an old up MotoX 'box?

Pointless? Too much work? Any better source of small straight cut gears?

Really just wondering if anyone's tried it.
jk

Trouble is just that the gearing --- the centrafugal blower is spinning so fast you get a massive flywheel effect and the loads on the gears are immense.

isn't it normally done with epicyclic gearboxes?

sources for which i don't know, but it's not just normal helical gears.
tom

Rotrex are about 10:1 through epicyclic gears.
Steve.

Yeah, most seem to use a planetry gear system, I guess it keeps them compact and roughly cylindrical.

there aint no gears with teeth in a rotrex box. thy have a set of planetary rollers and a specially developed traction fluid that makes for a sort of clutchlike thingy.

grtz Thomas

yep, and there lies the great current development (which I foresaw in my Uni thesis in 1998) whereby you use traction fluid type toroidal variator instead of the traction epicyclic, and operate the variator from the engine ECU.

You can alter the blower gearing constantly depending on engine speed and torque demand set by the throttle pedal.


then link the engine to a differential shunted toroidal transmission and you have a complete super efficient power plant with infinitely variable drive and automatic control, but with higher performance and efficiency than a current manual box........................

Not that I know owt about this sort of thing!