Glue cleanup on ribs

[Farrell]

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Hello Dale. I'm looking for a few more details describing your (or =
anyone's) center-pin-anti-skid methods. I was planning on trying =
something like that for my next board. I imagine the pins penetrate the =
panel side of the rib maybe 4 to 8 millimeters (just enough to gain =
solid footing) and penetrate the panel just a few millimeters (just =
enough to hold in position) - is that correct? Do you taper your ribs =
before gluing to panel - how do you handle running a pin through the =
thinner ends of the rib? Do you just use two pins per rib (obviously on =
short ribs) or do you maybe use three or more on the longer ribs?

One other thought on glue cleanup - one thing that I was going to try to =
implement - which relates to access for cleaning the glue joint =
squeeze-out. Adjust the top beam of the pneumatic clamp so that the hose =
can inflate most of its diameter (obviously maintaining full =
contact/pressure on rib). If the hose is allowed to inflate a goodly =
amount of its diameter, rather than allowing only a half-inch of its =
diameter and blobbing over the sides of the rib, you should be able to =
maximize access to the rib/panel joint for cleanup. Or at least I will =
be trying that next time.

Thanks.

Terry Farrell
  ----- Original Message -----=20
  From: Erwinspiano@aol.com=20
  To: pianotech@ptg.org=20
  Sent: Saturday, September 20, 2003 10:16 PM
  Subject: Glue cleanup on ribs


        Trix and I pressed up a S&S O board today. We tried using tight =
bond again but tried to get a better feel for just the right amount of =
glue to apply so that only a small amount of squezze came at the out =
when we turned up the 40 P.S.I  air pressure. It worked much better and =
the samller amounts of glue were more easily cleaned up with damp rags =
and dry paper towell. With only 11 ribs the spacing between cauls was =
wider and 1& 1/2 hrs. This will probably continue to be our chosen =
method.
     Also on a different subject ,on occasion we've had the ribs scoot =
sideways as we apply pressure (this happened with go bars to)  so we =
install short center pins into the ribs glue surface to keep them from =
skidding sideways when the pressures turned up.
     Dale Erwin
     Erwins Piano Restoration
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