Subject: Time: 1:51 PM OFFICE MEMO Re vector problem Date: 5/2/95 --------ORIGINAL POST------ > Date: Tue, 02 May 1995 06:42:38 -0600 (MDT) > From: Serge Harel <harel@LLC.org> > Subject: Vector problem > My question > > One of my costumer has a Kawai piano ten years old > and she tell me that is action is to heavy. After a standard > regulation of the action the feeling is still on the heavy side. > l' found that the captans was under the magic line > for 1/8 of a inch. > > What do you do to corect that? -----------MY REPLY------------- The theoretical, straight line relationship between the wip flange center, capstan/wip cushion bearing, and key bearing should exist to prevent skating between the capstan and wip cushion bearing. If there is no skating here, friction is essentially eliminated at this point. Make a visual check to see if skating occurs. Also, you can take two pieces of abrasive paper (I suggest 120 grit) a little larger than the size of a capstan top and glue the non abrasive sides together. Measure downweight on a key and then insert this piece of "two-sided" abrasive paper between the capstan and the wip cushion bearing. Measure downweight on the key again. If there is no change in the downweight (don't sweat a gram), there is, practically speaking, no skating between the capstan and the wip cushion bearing and the "straight line relationship" I described a few sentences ago is close enough. Be careful not to mar the capstan top. You can buff it up just to be sure after you are done your measurements. Ken Sloane, Oberlin Conservatory
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