At 07:29 PM 08/31/1999 +0200, you wrote: >Hi list > >I got two questions for you all relating to grand actions. > >#1. From time to time I run into a so called quality grand sort (I wont >mention the name but it starts with a "P" grin) that has an odd ball >problem regarding regulation. Basically said, unless the jack is >regulated waaaayyy back, the note will miss. I ran into this problem on >an action I just reworked, I had repacked the nuckles insureing a nice >round shape, took much care to regulate the return springs nicely, >height of the tip of the jack to repetition lever was set to play it >safe (I have had this problem before on other such grands) made sure of >basically everything. Still, upon setting the action in the piano >fifteen or twenty notes miss. And try as I may to find a reason, the >only thing that seems to help is to set the jacks so that they are well >back of the back edge of the core of the knuckle. Jack tips are barely >beveled and this is taken into acount. I suspect action geometry..(It is >never all that good on these things). Any ideas ??? Knuckles Too rounded(pointed?), pear-shaped is best Top of jack angled too much? Tight repetition lever pinning. Weak jack spring (butterfly?) or sluggish center. Heavy hammers. Wear ridges on knuckles, sand smooth, brush, burnish. > >#2. Brand new Yamaha C7. Action is very well bedded, and regulated. >Still on hard play in the middle area, 8 or 9 hammers on each side of >the note being hit raise (hop) very noticible. Feels like the hammer >rail is moving. All screws are dead tight. Lots of power seems to >dissapear. Only happens in the middle section of the action.. >Suggestions ?? > Springy hammer flange rail, You should see what happens on and other well know make (which begins and ends with an 'S'). Jon Page, Harwich Port, Cape Cod, Mass. mailto:jpage@capecod.net ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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