Noisy Action troubleshooting

[staff]

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> Hi All, 
> This week I will be diagnosing a new, very noisy, Nordiska grand
> action for a concerned dealer. 
> Nordiska is Chinese manufactured as you probably know. 
> Excessive action noise, present thru whole action, but worse on some
> keys/sections
> Key bushings are very loose, both balance and front rails. 
> Seems they've used a very thin bushing cloth that doesn't match the
> combination of skinny balance rail pin and key mortise. 
> 
> The dealer has seen some improvement thru repinning wippen flanges in
> previous actions.
> On this particular action, seems like flopping keys is the main
> culprit. 
> We're going to regulate, rebush  and glue size balance rail holes on a
> few keys to hear results. 
> 
> Any thoughts? 
> 
> I'm also suspicious of: 
> 
> Rep lever adj screw felt; creating noise when rep lever cycles and
> returns to rest quickly, sort of a click sound
> Rep lever buckskin contacting bottom of drop screw; another possible
> click
> Hammer rest cushion material used is really keybed felt, too
> hard/dense IMO; hammers bouncing on this material & rail system
> produce an audible "thump tone". 
> Also found a few loose backchecks.
> 
> 
> Best regards,
> 
> Brad Smith, RPT
> Smith Piano Services
> 483 Donald Street
> Bedford, NH 03110
> 
> 800-964-TUNE (8863) 
> 603-625-4696
> brad@smithpiano.com
> www.smithpiano.com
> NEW!! 24/7 Online Appointment Scheduling
> <http://www.smithpiano.com/schedule.htm> 
> 
> 

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