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Farmer John

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Reply with quote  #1 
Here is an example of a roller bearing from a Davis VF that was not able to turn while the sm continued to be used. After the roller was freed to spin, when the flat spot came to meet the needlebar, the needle missed the clearance hole, and slammed into the throat plate.  A new roller was fabricated from 0-1 oil hardening drill rod, hardened and tempered.
     These rollers can be difficult to free, requiring a strong solvent and heat.  Being very hard, the rollers can be grasped with pliers without damage.    Heat beyond 200 degrees F. is not necessary.  After being freed, continue to apply solvent and spin the roller to flush away the varnish.  Many rollers are held in place by a rivet and appear not to turn, by design, but I assure you that they were meant to turn freely.
John
100_2012.jpg 

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SteveH-VSS

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Reply with quote  #2 
Well said.
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WI Lori

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Reply with quote  #3 
And John makes it sound so easy, too.
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Lori in Wisconsin
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