17-05-2011, 11:10 AM
I noticed a fair bit of a vibration when I get the motor to about 3/4 throtel, I know it's reving pretty hard and you've got to expect some vibration. I did balance the prop nicely with a magnetic balancer and machined a new prop adapter, one that is dead true and a nice fit on the motor shaft. but still the nasty vibes persist.
I took the prop and adapter off the motor and checked the shaft with a dial guage and it runs true enough. When I rev the motor with nothiong on the shaft it still vibrates when the revs get up there.
Just now I've pulled the bearings out and will replace them with new ones from bearing industries tomorrow. The back bearing looks to have a little more slackness in it than the front one. Wether this will fix things or not I guess time will tell. The bearings seem to be a nice fit on the shaft and not too bad in the housing, the front one is neat needing a lite tap to get it out and the rear one slides in and out pretty nice.
I took the prop and adapter off the motor and checked the shaft with a dial guage and it runs true enough. When I rev the motor with nothiong on the shaft it still vibrates when the revs get up there.
Just now I've pulled the bearings out and will replace them with new ones from bearing industries tomorrow. The back bearing looks to have a little more slackness in it than the front one. Wether this will fix things or not I guess time will tell. The bearings seem to be a nice fit on the shaft and not too bad in the housing, the front one is neat needing a lite tap to get it out and the rear one slides in and out pretty nice.
“The knack of flying is learning how to throw your machine at the ground and miss.”
"When once you have tasted flight, you will forever walk the earth with your thoughts turned skyward, for there you have been, and there you will always long to return." ~Leonardo Da Vinci