<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; = charset=iso-8859-1"> <META content="MSHTML 6.00.2800.1400" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY> <DIV>From  <A href="http://www.westsystem.com/">http://www.westsystem.com/</A> := This site really has tons and tons of excellent info on epoxy = use.</DIV> <DIV> </DIV> <DIV>Terry Farrell</DIV> <DIV> </DIV> <DIV> Adhesive Fillers vs. Fairing = Fillers Fillers are used to thicken the basic = resin/hardener mixture for specific applications. Each filler possesses = a unique set of physical characteristics, but they can be generally categorized = as either Adhesive (high-density) or Fairing (low-density). Adhesive filler = mixtures cure to a strong, hard-to-sand plastic useful in structural applications = like bonding, filleting and hardware bonding. Fairing filler mixtures cure to = light, easily sandable material that is generally used for cosmetic or surface = applications like shaping, filling or fairing. ADHESIVE FILLERS 403 Microfibers 403 Microfibers, a fine fiber blend, is used as a = thickening additive with resin/hardener to create a multi-purpose adhesive, = especially for bonding wood. Epoxy thickened with microfibers has good gap-filling = qualities while retaining excellent wetting/penetrating capability. Color: off-white. 404 High-Density Filler 404 High-Density filler is = a thickening additive developed for maximum physical properties in = hardware bonding where high-cyclic loads are anticipated. It can also be used for = filleting and gap filling where maximum strength is necessary. Color: off-white. 405 Filleting Blend This strong, wood-toned filler = is good for use in glue joints and fillets on naturally finished wood. It mixes = easily with epoxy and lets you create fillets that are smooth and require = little sanding. Its color is a consistent brown, so 405 can be used to modify = the shade of other WEST SYSTEM fillers. 406 Colloidal Silica 406 = Colloidal Silica is a thickening additive used to control the viscosity of the = epoxy and prevent epoxy runoff in vertical and overhead joints. 406 is a very = strong filler that creates a smooth mixture, ideal for general bonding and = filleting. It is also our most versatile filler. Often used in combination with = other fillers, it can be used to improve the improve strength, abrasion = resistance, and consistency of fairing compounds, resulting in a tougher, smoother = surface. Color: off-white. FAIRING FILLERS 407 Low-Density = Filler 407 Low-Density filler is a blended microballoon-based filler used to make = fairing putties that are easy to sand or carve. Reasonably strong on a strength-to-weight basis. Cures to a dark red/brown color. 410 MicrolightTM 410 MicrolightTM is the ideal low-density filler for = creating a light, easily-worked fairing compound especially suited for fairing = large areas. Microlight mixes with greater ease than 407 Low-Density filler or = microballoons and is approximately 30% easier to sand. It feathers to a fine edge and = is also more economical for large fairing jobs. Not recommended under dark paint = or other surfaces subject to high temperatures. Cures to a tan color.</DIV> <DIV> </DIV> <DIV>----- Original Message ----- <DIV>From: "Isaac OLEG" <<A href="mailto:oleg-i@noos.fr">oleg-i@noos.fr</A>></DIV> <DIV>To: <<A href="mailto:davidlovepianos@earthlink.net">davidlovepianos@earthlink.net</A>>; "Pianotech" <<A href="mailto:pianotech@ptg.org">pianotech@ptg.org</A>></DIV> <DIV>Sent: Wednesday, May 19, 2004 6:27 = PM</DIV> <DIV>Subject: RE: Plugging capstan holes</DIV></DIV> <DIV> </DIV>> Hi Dave, what is Microlite ? > > Thanks for = your detailed explanations, it is interesting. > > Are some = epoxy quality more easy to drill and tap than others, or is > it mostly = the added powder that helps the final material to be easy to > work = with ? > > I have bought along the grain dowels from a wood = merchant. these are > used to plug knot holes in wooden floors. They are not = very round, but > suitable from 8 to 12 mm , in hard woods. > = > But the epoxy method seem fine indeed. > > best = regards. > > Isaac OLEG > > > -----Message d'origine----- > De : <A href="mailto:pianotech-bounces@ptg.org">pianotech-bounces@ptg.org</A> [mailto:pianotech-bounces@ptg.org]De la > part de David = Love > Envoye : mercredi 19 mai 2004 23:26 > A : Pianotech > Objet = : RE: Plugging capstan holes > > > I fill the entire hole = with epoxy.  West system and a generaous amount > of > = microlite (410).  Put it in a glue syringe and fill them up.  I = insert > the > syringe all the way to the bottom and back it out as squeeze = to get > the > stuff to the bottom of the hole.  The top = usually sags a bit and so > you > need to go over it a couple of = times within, usually, about 30 > minutes. > Even then the stuff = will eventuall sag a bit leaving a slight > indentation. > I've = dealt with this two ways and I'm not really sure which I prefer, > = but > both work.  First, let them sag to slightly below key level.  After > the > epoxy starts to set up--the slow set stuff = will harden quite slowly > but > reaches a point where it will not sag anymore--I mix up another batch > using > both microlite and = colloidal silica (406).  Mix it to the consistency > = of > whipped butter or mashed potatoes and then take an artists = palette > knife > and fill in the small indentation flush to the key = top.  When it all > hardens sand smooth with an orbital sander right in the = key frame. > You can > block the key ends to hold them more steady.  The other method > involves > adding a bit = more of the original batch out of the syringe as it > starts to > = thicken so that it sets up higher than the top of the key stick. > Before = it > totally hardens trim with a sharp chisel (wax it a bit first to = keep > it > from sticking) or a sharp japanese knife.  Clean up with = an orbital > sander. > > > I don't like using = dowels to plug the holes because I don't like > drilling > and = screwing capstans into the endgrain of a dowel.  You can, as some > do, > cut plugs out of old keys, drill the hole larger to cover the > coutersink, > plug and trim.  I find that it = takes too long.  The epoxy holds the > capstan > just fine and, = once hardened, drills and taps without any problems. > > = BTW  make sure that the old capstan holes aren't drilled all the way > = through the key.  Yep, I did find that out the hard way.  Thought = I'd > entered the Twilight Zone with a capstan hole that just never = seemed > to > want to fill up....imagine if you will.. > > = David Love > <A = href="mailto:davidlovepianos@earthlink.net">davidlovepianos@earthlink.net</A> > > > > [Original Message] > > = From: Phillip Ford <<A href="mailto:fordpiano@earthlink.net">fordpiano@earthlink.net</A>> > > To: <<A href="mailto:pianotech@ptg.org">pianotech@ptg.org</A>> > > Date: 5/19/2004 11:39:28 AM > > Subject: Plugging capstan = holes > > > > Would anyone care to offer some advice on plugging = capstan holes? > They > are often countersunk, so if you glue in a = dowel that's level with the > top > of the key there will be a gap = or open ring around the dowel.  If you > happen to be drilling near = this area it makes the bit wander.  If you > epoxy > in a dowel = and fill in the gap with epoxy it's pretty hard to level > them > = until the epoxy hardens.  So you essentially have to leave the dowel > = sticking out a bit and the epoxy mounded up a bit.  This means a lot > = of > sanding or filing after the epoxy hardens.  My current = modus operandi > is to > glue in a dowel that's a bit shorter than = the hole and punch it in so > that > it's a little below the top = of the key.  I then fill in the divot with > epoxy and level with a = razor blade before the epoxy sets.  Other > ideas? > Does = anyone fill in the entire hole with epoxy? > > > > Phi = Ford > > > > = _______________________________________________ > > pianotech list info: <A href="https://www.moypiano.com/resources/#archives">https://www.moypiano.com/resources/#archives</A> <FON= T face=Arial size=2>> > > > _______________________________________________ > pianotech list = info: <A href="https://www.moypiano.com/resources/#archives">https://www.moypiano.com/resources/#archives</A> <FON= T face=Arial size=2>> > > > _______________________________________________ > pianotech list = info: <A href="https://www.moypiano.com/resources/#archives">https://www.moypiano.com/resources/#archives</A></BODY><= /HTML>