Dynamic balancing by trial and error.


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Posted by Chris Case [108.162.215.186] on Sunday, May 15, 2016 at 10:16:46 :

I've done it this way on drive shafts, tires, and machinery shafts that spun faster than 10,000 rpm.

You need a vehicle with an open rear differential, and a helper to 'drive'. Put one rear axle up, on a jack strand. Chock the vehicle well. Have the 'driver' run it up to 25mph- the differential will double that speed on the raised wheel. Feel the vibrations at the fender. Have driver slow to a stop. NOT SLAM ON THE BRAKES. Add a guesstimate weight anydamplace on the rim. Maybe 4 oz on these big tires. Spin it up again. If better, shut down, move weight 45°, and spin again. If worse, jump it back 90°, to the other side of the initial point. If the first attempt was worse, move it 180°, spin again. Find the spot that the weigh does the most good. Then try varying the amount of weight.

It usually takes 8-10 tries. Then move another wheel to that axle,and repeat.

You can do the two rears with the tire/rim combo that will run there, to get the drums and hubs balanced as a set too. And if this procedure really tiggers you jolly spot, do the hub/drium combos separately. Maybe next time you re-pack the wheel bearings? ;^)

For drive shafts, put both rear wheels on jack stands, use a hose clamp as the temporary weight. The worm section will be the heavy part. Place permanently by spot welding washers to the tube.

Last high speed machinery shaft merely needed a longer set screw. A 1" instead of the 3/8" that was in the pully.



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