Quote:
Originally Posted by rusty959
I like where you went with this.
If you had to turn the compressor wheel because you couldn't find the washer size you needed, why not turn your own washer instead of the wheel? Seems like it may be easier.
How out of balance is the coupler? You might could possibly get it close enough in balance using an aircraft prop balancer or something.
Additionally you could use a coupler that uses a grub screw to secure the shafts, this might do a bit better of a job of being naturally balanced. (like the typical pinion gear does)
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I did consider making my own washer/spacer but decided it was just as hard as the tiny bit of machining needed on the wheel. Plus doing it on the wheel means one less part.
I agree a set screw couple would be closer to balanced, but I'm worried about how well it will handle the torque. It also has to resist the compressor wheel trying to pull itself forward as it spins which set screws are particularly bad at.
The coupler is heavy on the side opposite the screws so I think the best bet would be to remove some material on that side. Exactly where and how much would be trial and error. Some sort of stick-on balancing weight would be great but I'm not sure it would hold up long at 50K RPM and there isn't that much surface area on the light side to stick them too.