Glassing the block

[Delwin D Fandrich]

This is a multi-part message in MIME format.

---------------------- multipart/alternative attachment

  ----- Original Message -----=20
  From: Farrell=20
  To: pianotech@ptg.org=20
  Sent: January 04, 2002 5:49 AM
  Subject: Re: Glassing the block


  Hello Del. When you wax your plate flange, you must use some thin, =
wipe-on type of wax, such that it doesn't fill small depressions that =
may be present in the plate flange surface - or is that not really a big =
deal? What do you do.

  How thick do you make your epoxy mixture - peanut butter?

  Also, when you put your epoxy mixture in, what is your exact procedure =
in order to avoid having excess epoxy migrate to the area between the =
pinblock top and the plate web bottom and thus impair the fit. Do you =
screw the pinblock to the plate first and then mooosh epoxy into any =
small gaps between the pinblock and flange? Or do you put a bead of =
epoxy on the flange edge of the pinblock and draw it into the flange =
somehow? Thanks.


The wax is standard floor wax. Others use a spray-on mold release. =
Either works.

The consistency is about like peanut butter.=20

The pinblock is shaped for a good wood-to-flange fit first. Then the =
epoxy matrix is troweled on to the pinblock (front) surface with a =
suitable putty knife and the pinblock is screwed in place. There may be =
some migration up over the top because there is inevitably some space =
between the top of the pinblock and the bottom of the plate tuning pin =
panel. Unless, of course, you've done a perfect fit along the top as =
well. I've never managed to do that quite. The excess will clean off. =
When the epoxy has cured, disassemble the pinblock and clean it up. =
Knock off the squeeze-out along the edges, etc. I go over the whole =
thing with 60-grit sandpaper lightly to smooth of the roughness from the =
casting but not enough to alter the fit.

There are other procedures that probably work just as well. This is =
mine. I use the epoxy matrix to improve an already good =
pinblock-to-plate fit. Others simply hack out the block on a bandsaw and =
use the epoxy matrix to mate the whole thing. That seems to work as well =
but I've never been comfortable with the idea of it.

Del


---------------------- multipart/alternative attachment
An HTML attachment was scrubbed...
URL: https://www.moypiano.com/ptg/pianotech.php/attachments/c6/b0/73/ef/attachment.htm

---------------------- multipart/alternative attachment--