At 08:49 AM 06/06/2000 -0700, you wrote: ><snip> >lower the hammers to proper blow distance, and then set the let >off, (the hammers where now blocking after resetting the jacks). The hammers were blocking because you increased the action spread thus causing the contact point to be further out on the lever arm (repetition lever) which increases the arc. A place to start when determining action spread is to set it up so that the jack is 90 degrees to the shank when aligned properly to the knuckle at rest position. Also keeping in mind the line between the bottom of the b/r hole and wippen center, the wip cushion/capstan contact point falls on this line when the hammer is halfway to the string. >At this point there was insufficient dip so that let off on most >of the keys was barely possible only when pressing them down >hard. I proceeded to take the stack off and and add to the >balance rail to increase dip, (there were not enough front rail >punchings to remove to establish proper dip). While I was at it, <snip> > >Rob Goodale, RPT Before raising key height, make certain the sharps will retain a minimum of 1/4" depth onto the front rail pin. Less than that and the end of the pin will be digging into the bushing during play. Regards, Jon Page, piano technician Harwich Port, Cape Cod, Mass. mailto:jonpage@mediaone.net ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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