Ed Miller- 1/8" jack escapement is too much. 1/16" is plenty. Check for lost motion. Excess lost motion is often just enough to steal your aftertouch. Use a checking distance gauge as Cy Shuster recommends. Bend a coat hanger wire to 5/8" or mount a section of 5/8" dowel on a stick. Worn hammers or flat hammer butts may make it impossible to get a good regulation. If you are studying for the RPT exams, you can post questions like this to the ExamPrep list (see members' section of ptg.org) Ed Sutton -----Original Message----- >From: ed miller <edmiller3 at hotmail.com> >Sent: Jan 25, 2007 8:42 PM >To: pianotech at ptg.org >Subject: aftertouch vs jack escapement > >I'm regulating a Knabe upright. Im having a problem juggling acceptable >aftertouch vs. an acceptable amount of jack escapement out from under the >hammer butt. > >With blow distance set at 1.75", let-off at 1/8", key dip at 3/8" and >checking at 5/8".... aftertouch is about .040". With the dimensions as such >the key feels like it plays well. In previous regulations I would have been >very happy with this. > >However, this time I'm regulating according to Bill Spurlock's Vertical >regulation pamphlet. In it he talks about aiming to have jack escapement be >1/16-1/8" out from under the hammer butt when the key is fully depressed. >With all of the above dimensions in this Knabe upright the jack doesn't >rotate completely out from under the hammer butt. > >Spurlock suggests decreasing the hammer blow distance to allow the jack to >escape further. When I do this my aftertouch becomes too great. If rather, I >increase the key dip to allow for more jack escapement aftertouch becomes >too great again. > >In order to have the jack escape properly I would have to decrease the >hammer blow distance to under 1.5 (I know because I tried it). As I >suspected my aftertouch shot up, it was then .100. If I then decrease key >dip, the jack doesnt rotate far enough. > >Then I tried to make my checking earlier. Even at less then .5 checking the >jack doesnt completely get out of the hammer butts way before it is caught. > >What do I do???? > >Thanks, Ed > >_________________________________________________________________ >Get Hilary Duffs homepage with her photos, music, and more. >http://celebrities.live.com&ocid=T001MSN30A0701 >
This PTG archive page provided courtesy of Moy Piano Service, LLC