Glue cleanup on ribs

[Keith Roberts]

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Terry,  Dale meant bridge pins. You drill a hole in the rib, insert pin =
and cut it off 1/8 inch or so. The spruce board is soft enough that you =
aren't going to split the rib. Put 3 in a long rib. The ends are tacked =
with a tiny finish nail for the prep work. They act as locater pins when =
gluing. Of course nothing penetrates through the board.
Keith


----- Original Message -----=20
  From: Farrell=20
  To: Pianotech=20
  Sent: Sunday, September 21, 2003 4:50 AM
  Subject: Re: Glue cleanup on ribs


  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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