Alan: I'm probably at the tight end of the spectrum because I like the repetition you get when the repetition spring is set pretty strong, yet I don't like the hammer to jump. I'm sure there is a "too tight" but I really don't know what problems I'd look for that would be caused by it. Bill Garlick was the first I'd heard who recommended pretty tight pinning. I tried it and I liked it. dave David M. Porritt dporritt@smu.edu -----Original Message----- From: caut-bounces@ptg.org [mailto:caut-bounces@ptg.org] On Behalf Of Alan McCoy Sent: Thursday, June 30, 2005 1:40 PM To: College and University Technicians <caut@ptg.org> Subject: Re: [CAUT] Center pinning Thanks David and Don, Interesting that we have 4g or 6-8g at the pad. Anyone else out there have spec and rationale. I guess when I have actually done this with a gauge I have aimed for 4-6g also at the pad (using the pad more for convenience than anything more sophisticated) but I have always wondered as I was doing it about the rationale for this method and about the practical effect for the pianist. Speaking of RH maybe it's better think of specs as x grams @ 45%. So in this light, is your spec at a medium RH like 45%? Alan > From: Don Mannino <DMannino@kawaius.com> > Reply-To: "College and University Technicians <caut@ptg.org>" <caut@ptg.org> > Date: Thu, 30 Jun 2005 10:46:09 -0700 > To: "College and University Technicians <caut@ptg.org>" <caut@ptg.org> > Subject: RE: [CAUT] Center pinning > > Alan, > > Sorry, I don't have an easy way to accurately check friction without > removing the wippen and pulling the spring loose. You can do a quick > check by lifting the hammers, pushing down on the rep spring with the > spring tool, then flipping the rep lever up and down - but that's pretty > low precision, I admit. You can at least tell if the pinning is crazy > loose (side-to-side play is excessive, part flops around very loosely) > or too tight (lever stays firmly in any position you put it). I have > done a similar thing on jacks by un-hooking the top of the spring and > lightly flipping the jacks around to check for relative tightness. > > As for friction guidelines, here is what I go for: > - For the Rep lever, disengage the spring and check with the spring type > gram gauge on the drop screw pad. I like 4 grams on the pad - which is a > very snug fitting center. > - For the jack, the key to good repetition is to have enough friction to > control the movement of the jack's mass. So with the wippen out and the > spring disengaged, hold the wippen with the jack tender pointing up > (wippen flange down). Pull on the tender so that the jack tip raises up > against the stop felt, then let it fall. The weight of the jack and the > regulating screw / button should make it glide slowly back to rest - not > fall quickly. This will help control the vibration of the jack during > fast playing, which will help prevent skipping notes during fast > repetition. > > Ambient humidity needs to be kept in mind. If the weather is humid pin > slightly tighter, etc. > > Don Mannino RPT > >> -----Original Message----- >> From: caut-bounces@ptg.org [mailto:caut-bounces@ptg.org] On >> Behalf Of Alan McCoy >> Sent: Thursday, June 30, 2005 10:07 AM >> To: College and University Technicians <caut@ptg.org> >> Subject: [CAUT] Center pinning >> >> >> Hey, >> >> Does anyone have an effective and efficient method of >> checking pinning on jacks and rep levers? And what specs do >> you strive for? I know in my previous work these two centers >> get less attention than they deserve if I want very >> consistent repetition. Thanks for any suggestions. >> >> Like Mark Cramer I really enjoyed the time in Kansas City >> putting name to face and I look forward to meeting more of >> you in the future. This list is a vital part of my >> effectiveness and enjoyment of the workplace here. >> >> Alan >> >> >> -- Alan McCoy, RPT >> Eastern Washington University >> amccoy@mail.ewu.edu >> 509-359-4627 >> >> >> >> _______________________________________________ >> caut list info: https://www.moypiano.com/resources/#archives >> > _______________________________________________ > caut list info: https://www.moypiano.com/resources/#archives _______________________________________________ caut list info: https://www.moypiano.com/resources/#archives
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