This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Although I don't know for sure how long my recommended method will last, = I do know there are many types of epoxy out there and many of them will = not necessarily make a strong bond to wood. At http://westsystem.com, in = the user manual is the process I follow. Also in the user manual are all = sorts of recommendations for surface prep of various woods, etc.=20 Two-step bonding 1. Wet-out bonding surfaces-Apply a neat resin/hardener mixture (without = fillers) to the surfaces to be joined (Figure 9). Wet out small or tight = areas with a disposable brush. Wet out larger areas with a foam roller = or by spreading the resin/hardener mixture evenly over the surface with = a plastic spreader. You may proceed with step two immediately or any = time before the wet-out coat reaches the final cure stage. =20 2. Apply thickened epoxy to one bonding surface. Modify the = resin/hardener mixture by stirring in the appropriate filler until it = becomes thick enough to bridge any gaps between the mating surfaces and = to prevent "resin-starved" joints. Apply enough of the mixture to one of = the surfaces, so that a small amount will squeeze out when the surfaces = are joined together with a force equivalent to a firm hand grip (Figure = 10). Thickened epoxy can be applied immediately over the wet-out surface or = any time before the wet-out reaches its final cure. For most small = bonding operations, add the filler to the resin/hardener mixture = remaining in the batch that was used for the wet-out. Mix enough = resin/hardener for both steps. Add the filler quickly after the surface = is wet out and allow for a shorter working life of the mixture. Used properly, I suspect a good epoxy like West System will hold up at = least as long as the rest of the pinblock. West System epoxys have been = used in the marine industry for at least three decades. The iceboats and = other boats put together with this epoxy experience much more drastic = climactic conditions than (most) any piano pinblock will ever see. Still not proof for pinblock plugs. But I feel comfortable with the = process when done according to manufacturers=20 =20 =20 ----- Original Message -----=20 From: "Delwin D Fandrich" <pianobuilders@olynet.com> To: "Pianotech" <pianotech@ptg.org> Sent: Tuesday, December 31, 2002 12:00 PM Subject: Re: Knabe Grand/Plugs >=20 > ----- Original Message ----- > From: "Ron Nossaman" <RNossaman@cox.net> > To: "Pianotech" <pianotech@ptg.org> > Sent: December 31, 2002 8:30 AM > Subject: Re: Knabe Grand/Plugs >=20 >=20 > > > > >Plugging an intact pin block is often my choice, especially with > open-faced > > >types. I use 3/4" plugs so that they interlock. Once that is > accomplished, I > > >veneer over the plugs with something like birdseye maple. It is = really > nice > > >looking and has an original finished look about it. The trick is in = the > > >"fixture" needed to do all the drilling. > > >Best Regards, > > >Joe Garrett, RPT, (Oregon) > > > > I've done this with 1/2" plugs and veneer overlay. Drilled with the = same > > setup I normally use drilling pinblocks in the piano. > > > > Ron N >=20 >=20 > Joe & Ron, >=20 > I've pretty much resisted doing this through the whole block simply = because > I don't trust the structural integrity of the resultant = plug/glue/epoxy > mass. Given the vagaries of wood expansion and contraction with = climate > changes, just how stable is this some-unpredictable mass going to be = over, > say, 30 or 40 years. I've examined several of these jobs done by = others > after just a couple of years and have always been able to see at least = some > print-through image of the plugs on the veneer face. It's made me = wonder > just what is going on down there. >=20 > Del >=20 > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/f8/89/9b/fa/attachment.htm ---------------------- multipart/alternative attachment--
This PTG archive page provided courtesy of Moy Piano Service, LLC