Good point, David. This also occurs when the spring slot is gummed up, or the spring has been incorrectly bent so that the spring contacts too close to the rep lever center pin. But I also believe that a fairly tight rep lever bushing is beneficial to action performance, within reason. Measuring 4 grams at the drop screw pad is a pretty tight fit and seems to give good performance. I have had good luck solving repetition and spring return issues this way when I found 0-1 grams resistance in the repetition lever center. Some advocate even higher friction than this, but I agree also that this can degrade smooth pianissimo playing. Don Mannino -----Original Message----- From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of David Stanwood Sent: Wednesday, December 01, 2010 8:55 AM To: caut at ptg.org Subject: Re: [CAUT] F..riction (rep spring) Fred and Alan, This could be another thread but here's my 2 cents... We find ourselves in situations sometimes when the rep spring lifts the hammer in a nice controlled motion upon release from the back check yet the jack still cannot be made to return under the knuckle... even to the point were the repetition lever height adjustment button is completely off it's rest pad to no avail. Repinning the rep lever can sometimes make this symptom disappear. Is this what you're referring to Fred? My take on it is that when this happens it indicates that the wire size of the repetition spring is to high so that when it even just starts to work it's already too tight after going just a little way into its arc, so it's kind of on the edge of starting to work.. switching to a smaller spring size will solve to problem or going with a heavier hammer... When the hammer weight and spring size is matched the rep lever will work with low friction. David Stanwood >Fred, > >By "pinning those reps heavy" do you mean tighter pinning? Can you put >a number on it, as in what do you aim for in pinning rep levers? >I know that some go for pinning reps at about 8g, but on nearly every >new set of wips I've encountered the reps are pinned in the 0-1g range, >at least when I get them. I don't know what the manufacturer aims for. > >Thanks. > >Alan > > >Certainly pinning those reps heavy makes it easy from the technician's >point of view, to set springs so the hammer rises nicely in our >artificial emulation. And I have found situations where heavier pinning >was necessary to get the jack to re-set under the knuckle consistently.
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