We use 3/32". It is a multiply birch material. Approximately 1/2" or so, three to a block. We use our Spurlock felt cutting block as an alignment jig. Place the precut felt blocks at predetermined spots in the "jig" and glue em up. Dale F On Fri, 31 Aug 2001 07:48:55 -0400 "Farrell" <mfarrel2@tampabay.rr.com> writes: > How thick an airplane ply do you use? How long do you make your felt > segments? Bill Spurlock suggests 5/8" long, but that would occupy > 15/16" of > the 20/16" -long damper board. You would only have a tad over 1/8" > between > segments. Thanks > > I think I will order a set of Yamaha dampers, a set of Renner > dampers, and > make some of my own, and then decide what I want to do. > > Terry Farrell > > ----- Original Message ----- > From: "Dale R Fox" <foxpiano@juno.com> > To: <pianotech@ptg.org> > Sent: Thursday, August 30, 2001 10:53 PM > Subject: Re: Spurlock Damper Design > > > > Hi Terry, > > > > You can use aircraft ply available at the local hobby shop if you > want > > better stability than solid basswood. Renner sells nice sets of > premade > > upright dampers about 2 1/4" or so long. A bit pricey at $50/set. > Look > > inside a European upright and you will likely see a set if it is a > Renner > > action. We just make our own. Make several sets at a time as a > time > > saver. > > > > Dale Fox > > > > On Thu, 30 Aug 2001 15:21:25 -0400 "Farrell" > <mfarrel2@tampabay.rr.com> > > writes: > > > Thanks for the input Ed. Yes, I was planning on getting enough > > > material for > > > 3 or 4 sets of dampers. I was also thinking of the mass thing. > Bill > > > indicated he made his little damper 2-1/4" by 3/8" rectagles out > of > > > basswood. I was thinking at least to start with some hard maple > or > > > any other > > > dense wood that glues well just to put a little mass in the > system. > > > I figure > > > it is not like the grand damper in that you are lifting it up - > you > > > will > > > only have a small amount of inertia to overcome because the > damper > > > travel > > > arc is nearly horizontal. I'll give some thought to the lead > thing. > > > I think > > > I will avoid the fishing weights :-). The lead I have from the > > > Stanwood > > > stuff could simply be glued to the back (pianist side) of the > > > hardwood > > > damper rectangle is extra weight is proves beneficial - or maybe > > > even > > > wrapped around the dowel damper head and secured with a drop of > > > thick CA > > > glue. I'll keep the spring tension in mind also. Thanks. > > > > > > Terry Farrell > > > > > > ----- Original Message ----- > > > From: "Ed Sutton" <ed440@mindspring.com> > > > To: <pianotech@ptg.org> > > > Sent: Thursday, August 30, 2001 2:43 PM > > > Subject: Re: pianotech-digest V2001 #1106 > > > > > > > > > > Terry- > > > > I have done this. It is worth doing. You may also need to > > > replace the > > > > damper wires and bend them to a different shape to get > clearance > > > between > > > the > > > > wire and adjacent damper heads. > > > > > > > > Also add some small weights to the damper heads. It will > improve > > > damping > > > > and allow you to soften the springs in the tenor and treble, > which > > > will > > > make > > > > the action lighter. One way is to drill the old damper heads > to > > > hold the > > > > little 1/4 inch leads from Apsco. Another is to wrap lead > wire or > > > clamp > > > > fishing weights around the damper wire. > > > > > > > > When you buy the supplies for the dampers, buy enough for 3 or > 4 > > > more > > > > pianos. Those trips to the hobby shop waste time. > > > > Ed Sutton > > > > > > > > > > > > ---------- > > > > >From: owner-pianotech-digest@ptg.org (pianotech-digest) > > > > >To: pianotech-digest@ptg.org > > > > >Subject: pianotech-digest V2001 #1106 > > > > >Date: Thu, Aug 30, 2001, 10:53 AM > > > > > > > > > > > > > > > > > > --------------------------------------------------------------------- > > > > > > > > > > Date: Thu, 30 Aug 2001 10:34:50 -0400 > > > > > From: "Farrell" <mfarrel2@tampabay.rr.com> > > > > > Subject: Upright Damper Replacement > > > > > > > > > > Hi gang. Bill Spurlock wrote an article in the Journal in > '94 > > > about > > > upright > > > > > damper replacement. The bottom line was that he said that he > > > found that > > > many > > > > > or most old uprights had bass dampers that were too short > and he > > > had the > > > > > best luck with dampers that were from 2 to 2-1/2 inches > long, > > > equipped > > > with > > > > > three pieces of 5/8" long wedges. He described how he made > his > > > own > > > dampers > > > > > (making the little boards and gluing the dampers onto new > dowel > > > damper > > > > > heads) and the process he uses to determine what size will > work > > > the best > > > for > > > > > any particular piano. > > > > > > > > > > Have any of you gone this route? Or know anyone that has? Is > > > this > > > generally > > > > > a good way to go about getting good working new dampers on > an > > > old > > > upright? I > > > > > think most of what Bill Spurlock writes is pretty much right > on > > > target, > > > but > > > > > just looking for a second opinion. This is my first upright > > > damper job, > > > so > > > > > it's not as if I gonna draw upon my own personal vast > resources > > > of > > > > > experience. Thanks. > > > > > > > > > > Also, he does not mention using the dowel damper heads in > the > > > tenor, but > > > > > does suggest that some of the first strings in the low tenor > > > often > > > benefit > > > > > from a longer damper. Can I trust that there is nothing > wrong > > > with using > > > the > > > > > dowel damper heads in this area? And is there anything wrong > > > with making > > > > > your own dampers for all the treble strings (that originally > had > > > dampers) > > > > > and mounting them on dowel damper heads? Thanks again! > > > > > > > > > > Terry Farrell > > > > > > > > > > ------------------------------ > > > > > > > ________________________________________________________________ > > GET INTERNET ACCESS FROM JUNO! > > Juno offers FREE or PREMIUM Internet access for less! > > Join Juno today! For your FREE software, visit: > > http://dl.www.juno.com/get/tagj. > ________________________________________________________________ GET INTERNET ACCESS FROM JUNO! Juno offers FREE or PREMIUM Internet access for less! Join Juno today! For your FREE software, visit: http://dl.www.juno.com/get/tagj.
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