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Posted by 4stripes | Mar 25, 2013 @ 09:25 AM | 1,046 Views
The following method is what is widely known as the clock method of dynamic balancing.

This example is for one piece rotors that have a separate spinner.

Most rotors made fairly recently have decent static balance right out of the box. By static I mean they will appear balanced when placed on a typical prop or rotor balancer. If yours is not reasonably well balanced place weight where necessary inside the hub from the back of the rotor. One way is to add small squares of duct tape and another is to add some fast setting glue like 5 minute epoxy or CA with quickset. If using glue you will have to roughen up the area for the glue to stick.

Before assembly add a drop of tri-flow oil to your motor bearings for longevity.

Also trial fit the adapter and make one flat spot on the shaft for the adapter to be held from twisting (if it is held on with set screws). Make a mark on the motor shaft opposite end to know where the flat spot is. Black sharpie will do if you clean the shaft with some alcohol first.
If the adapter is a collet type (no set screws) then no flat spot needed but it is good to roughen up the shaft for the collet to grip better. Be careful there is enough clearance for the rotor once installed in the shroud. Sometimes the adapter can push too far onto the shaft so to make things easier make a spacer from brass tubing that has the adapter properly spaced. Nothing more frustrating than an adapter pushed too far into the shaft and the fan now rubs and won't...Continue Reading