Plate Suspension--Carl Meyer

[Carl Meyer]

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Dale, forgot to say that I was talking about 3/8.  Half inch is okay.  =
Counterbore is then larger.  Use the old bolts to decide what to use.  =
Most pianos I see use smaller plate bolts than S&S.  A hole saw should =
work well for the counterbore. =20

Carl
  ----- Original Message -----=20
  From: Erwinspiano@aol.com=20
  To: pianotech@ptg.org=20
  Sent: Sunday, December 07, 2003 1:05 PM
  Subject: Plate Suspension--Carl Meyer


  In a message dated 12/7/2003 11:49:37 AM Pacific Standard Time, =
cmpiano@comcast.net writes:
    The hanger bolts I referred to have wood type screw threads on one =
end and machine threads on the other.  I'm more comfortable with the =
wood screws into the rim.  The holes need to be waxed (bees wax) so that =
a slot cut in the top of the screw can be used to position the plate.  =
You'll need to lock the nut under the plate.  I typically use a set =
screw  into the side of the nut.  A brass or chrome cap nut (acorn nut) =
and washer finishes the job.

    Carl Meyer Ptg assoc
    Santa Clara, Ca.
       Carl, Refresh my memory on what exactly is a hanger bolt.  Ok =
Draw me a picture this sounds to easy.  I'm envisioning a wood threaded =
device, say 3 "of 1/2" thread & then it has another half or part that =
is, say an 1 to 2 inches long which is a machine thread. The wood =
threads go all the way into the rim & the machine screw threads extends =
up thru the plate boss. The nut which has been lock tighted to the =
threads extends thru the plate. Then you're adjusting the hole thing by =
turning the top with a screw driver to set plate height & when done the =
cap nut goes on. So as in the Coleman suspension system the amount of =
machine thread protruding thru the plate boss can't be any taller than =
the cap nut. Right?  the only problem with this is that on S&S the plate =
often sits within  .050 of the board surface at the perimeter. On the =
Coleman system I have had the bolt heads thinned to that amount.What can =
be done here?
    Can you provide me with a source or send me a box with nuts & =
washers?
    Thanks-- Dale Erwin

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