On Mon, 31 Mar 1997 00:16:15 -0600, Joel Rappaport wrote: >This is getting long, so I am replying up here at the top. Jon Page ha= s >an excellent point (from another post entirely). > >Warren, your idea is much better than a simple capstan mostly because o= f >the force and frequency of right (damper lift) pedal use. However, now= >that I think of it, we use a capstan to limit the sostenuto lever trave= l >and stay with the block of hammer felt for the damper lift pedal. As >long as it stays glued onto the lever (we use hot hide glue), it won't >change much from compression and is a big enough surface to take a lot >of foot stomping (ever watch Andr=82 Watts when he really gets into it?= ). > >Also, Allan L. Gilreath made an excellent observation: >> However, I've found the >> capstan that Kawai uses (perhaps used to use?) can get the threads st= ripped >> out in the wood and not perform their function under HEAVY use. > >The lag screw or bolt that needs grinding starts to be too much time >compared to using a felt block. It only takes 1-2 minutes to cut an >appropriate piece of hammer felt and glue it onto the lever. "Fine" >adjustments can be made by sliding the felt block just a little bit >forward or back on the lever just before gluing it as you set the amoun= t >of damper lift you want. The lever moves in an arc, you know, and >placement of the block will change how far up the dampers are allowed t= o >move. This adjustment is made in conjunction with how high the keys of= >a finish-regulated action raise the dampers. Then the damper stop rail= >is adjusted. Hope this helps. >----Joel >> >> Joel Rappaport wrote: >> > >> > Greg Newell wrote: >> > > >> > > Joel Rappaport wrote: >> > > > >> > > > The excessive pedal and trapwork travel is what does it. Addit= ional >> > > > pieces of hard felt or a new, thicker block of hammer felt glue= d on top >> > > > of the trapwork lever will adjust this. >> > > >> > > What about retrofitting the style limiter that Kawai uses with th= e >> > > inverted capstan to limit pedal travel? Seems like a good idea. >> > > Adjustable whenever! >> > > Greg >> > > gnewell@en.com >> > ------------------------ >> > An excellent idea, Greg. All you would need to do is install a cap= stan >> > on the underside of the keybed. It should hit some pretty hard fel= t for >> > the regulation to be effective and long lasting. The reason I did = not >> > mention this (we do this in our rebuilding, BTW) is that the capsta= n >> > will give you a really good fine adjustment to the trapwork lever (= and >> > hence, pedal) travel. What Jim Coleman was referring to, however, = was a >> > pretty severe case of heavy foot. Considering the small area of th= e >> > capstan head and the force that is placed on the trapwork lever dur= ing >> > foot stomping, a 3cm (about 1-1/4") square of hard hammer felt will= take >> > that force better. >> > >> > Joel >> >> Joel, >> >> What about using a hex head lag screw or a large flat-headed machine= >> bolt with the business end rounded off on the grinder to give you fin= e >> contol as well as a broad contact surface? >> >> What'cha think? >> >> Warren >> -- >> Warren D. Fisher >> fish@communique.net >> Registered Piano Technician >> Piano Technicians Guild >> New Orleans Chapter 701 > Joel, I appreciate the use of the Hammer felt as a strronger substitute for t= he inverted capstan. I wonder ... could the adjustment ever need to be changed after= we glue that felt on and if so perhaps 2 capstans would be viable. Greg Greg and Mary Ellen Newell Greg's Piano Fort=82 Lakewood, Ohio gnewell@en.com
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