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Rotor balancer


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#1 ol' stonebreaker OFFLINE  

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Posted February 14, 2017 - 02:56 PM

  Made this up for the rotor on my MTD chipper/shredder. It's had a vibration ever since I bought it several yrs ago. Enough so it was cracking some of the sheet metal. I had my local machine shop make up the stub shaft with a 3/8"x 16 hole in the end and ordered  3/8" and 1" ball bearings. Rotated it slowly to let it stop several times with the light side on top and started adding weld to that side until it will stop at random points which tells me it's static balanced. Now in a few weeks I'll find out if it's dynamic balanced. Took quite a bit of .023 wire as you  can see by the pic. I had to wire all the hammers out to their in operation position for balancing purposes.

                                      Mike

 

 

rotor 001 (Small).JPG

 

rotor 002 (Small).JPG

 

rotor 003 (Small).JPG


Edited by ol' stonebreaker, February 14, 2017 - 02:58 PM.

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#2 SimplyRad OFFLINE  

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Posted February 15, 2017 - 09:08 AM

Are all of the wires the same weight? If not that can throw your balance off.



#3 ol' stonebreaker OFFLINE  

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Posted February 15, 2017 - 09:56 AM

  The wire came off the same roll and was one piece. The only difference in wire weight would be where the two ends met which was near the light side.

                                              Mike



#4 secondtry ONLINE  

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Posted February 15, 2017 - 01:38 PM

were the holes in the top of the rotor in the second picture original. That appears to be an attempt at balancing. Don



#5 ol' stonebreaker OFFLINE  

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Posted February 15, 2017 - 05:19 PM

were the holes in the top of the rotor in the second picture original. That appears to be an attempt at balancing. Don

  Yep, they are original. Makes me wonder about the mfgr's balancing operation since the holes were about a 1/4 turn from the light spot.

                                                    Mike



#6 Bruce Dorsi OFFLINE  

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Posted February 15, 2017 - 05:58 PM

  Yep, they are original. Makes me wonder about the mfgr's balancing operation since the holes were about a 1/4 turn from the light spot.

                                                    Mike

 

Is it possible it was in balance when new, with new hammers?

 

Are all the existing hammers equal, or do some show more wear than others?

 

Accumulated dirt and/or wear on the pins & spacers can also affect balance.



#7 ol' stonebreaker OFFLINE  

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Posted February 15, 2017 - 09:52 PM

  I removed and turned each set of hammers  before balancing and they all appeared to have an equal amount of wear. While I had each set out I cleaned all the dirt/debris out of the hammer brackets. All the pins, spacers and hammers seemed to be in good shape with no excessive wear. I broke my pin punch on the last roll pin and had to heat a drill bit the right diameter to almost melting and let it cool to use for a punch and finally got it out.

                                       Mike 


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