Check the pinning of the hammer flange. I had a problem with some not playing, because the would hang up on the backcheck. I repined, and then they were ok. I think that was on hard blows, though. John M. Ross Windsor, Nova Scotia, Canada jrpiano@win.eastlink.ca ----- Original Message ----- From: "William R. Monroe" <A440WRMPiano@tm.net> To: <ilvey@sbcglobal.net>; "Pianotech" <pianotech@ptg.org> Sent: Tuesday, November 09, 2004 9:32 PM Subject: Re: About Checking > The tail shape is right on (thanks Renner). I had the Renner shop do the > shaping, arcing, roughing bit. I'm not ready to tackle hanging hammers > yet, > so I had them hang a set for me on new shanks, flanges, with all the prep > work, leaving me to concentrate on regulation stuff. Any other ideas from > the "list" as to what would cause this checking problem? > > William R. Monroe > Madison, WI > Assoc. > ----- Original Message ----- > From: "David Ilvedson" <ilvey@sbcglobal.net> > To: <pianotech@ptg.org> > Sent: Monday, November 08, 2004 9:55 PM > Subject: RE: About Checking > > >> Go to http://ptg.org/ Click pianotech archives and search hammer > checking. Make sure your hammer tail shape is right...i.e. a 2&1/2 to 3 > inch radius. Do the tails come down flat and then angle sharply in at > about 25 degrees? Wrong shape=poor checking. The simpliest thing to do > when you have existing hammers to deal with is take ruler or better yet a > protractor and look at what circle with a 3 " radius looks like. That > curvature shape is what you are after, what the shape of your hammer > should > look like from the side. Clamp a section of hammers up on a block so > they > are above the backchecks and you won't put undue stress on the centers. > Take a drill with a sanding disk and 60 sandpaper. If you carefully run > along the hammer tails you can duplicate that shape and make a BIG > difference in checking. 1st even out the ins and outs of the hammer > tails > coming from poorer hammer hanging, then start bringing down the angle, > smoothing it out. >> >> David I. >> >> >> ----- Original message ----------------------------------------> >> From: "William R. Monroe" <A440WRMPiano@tm.net> >> To: Pianotech <pianotech@ptg.org> >> Received: Mon, 8 Nov 2004 20:11:55 -0600 >> Subject: About Checking >> >> >Hi List, >> >> >I've a small grand that I'm regulating (mine) and I'm struggling with >> >checking. Just finished regulation, and everything works well except >> >checking. Checking is nice and even throughout from a medium blow on up > at >> >15mm. I've double checked things like: repetition spring tension - >> >definitely not too strong; escapement - jack is clearing knuckle >> >sufficiently; backcheck height and angle seem right. I guess my >> >thoughts >> >now lean towards, maybe backchecks are too low? I can get checking on a >> >soft blow by decreasing the checking height from 15mm to about 8 or 9, > but I >> >just don't like it that close. Thoughts? and Thanks. >> >> >William R. Monroe >> >Madison, WI >> >Assoc. >> >> >> >_______________________________________________ >> >pianotech list info: https://www.moypiano.com/resources/#archives >> >> _______________________________________________ >> pianotech list info: https://www.moypiano.com/resources/#archives >> > > > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives >
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