<!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 bgColor=#ffffff>
<DIV><FONT face=Arial size=2>Hey, ya learn sumptin' new every day. =
Please tell
me more. How does the bare nut act as a stress concentrator (and what =
exactly is
a stress concentrator). How does a flat washer help distribute the =
load (if
the nut was only touching the plate in one spot, it seems that even with =
a
washer in there it would still do the same)?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I know sometimes I will pose a question =
facetiously, but as I do not have any background in mechanical =
engineering,
I am genuinely curious to hear more on this. Thanks.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Terry Farrell</FONT></DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>
<A title=deanmay@pianorebuilders.com
href="mailto:deanmay@pianorebuilders.com">Dean May</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A =
title=pianotech@ptg.org
href="mailto:pianotech@ptg.org">Pianotech</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, January 08, =
2005 12:58
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> RE: seeking wood =
screws</DIV>
<DIV><BR></DIV>
<DIV><SPAN class=671354917-08012005><FONT face=Arial =
color=#0000ff size=2>It's
a throwback to my days as a design engineer. It is bad practice to =
place any
kind of stress concentrator against cast iron. The washer is a =
little
insurance to distribute the load, though ideally it should be hardened =
to
maximize its effectiveness.</FONT></SPAN></DIV>
<DIV><SPAN class=671354917-08012005><FONT face=Arial =
color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=671354917-08012005><FONT face=Arial =
color=#0000ff
size=2>Thanks for the tip on the hole.</FONT></SPAN></DIV>
<DIV><SPAN class=671354917-08012005><FONT face=Arial =
color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=671354917-08012005><FONT face=Arial =
color=#0000ff
size=2>Dean</FONT></SPAN></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT =
face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> <A
=
href="mailto:pianotech-bounces@ptg.org">pianotech-bounces@ptg.org</A>
[mailto:pianotech-bounces@ptg.org]<B>On Behalf Of =
</B>Terry<BR><B>Sent:</B>
Saturday, January 08, 2005 11:34 AM<BR><B>To:</B>
Pianotech<BR><B>Subject:</B> Re: seeking wood =
screws<BR><BR></FONT></DIV>
<DIV><FONT face=Arial>Why do you put a washer on top of the =
up-side-down
lock nut that goes on the backside of the plate - assuming of course =
that
the nut has enough horizontal surface area to mate with the plate =
(and not
want to fall through the hole)? I would just be afraid of a =
potential
rattle/buzz if one of the assemblies got a little loose (I realize =
that none
should be). I just haven't found that to be needed. I do put a =
washer on the
top though - but mostly to protect the plate finish while tightening =
the
acorn nut on top.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>5/16-inch hole gives me a nice very snug
fit.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Terry Farrell</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial"> </DIV>
<DIV><SPAN class=906561315-08012005><FONT face=Arial =
color=#0000ff
size=2>All this talk of screw sources has had me browsing some =
of these
sites. Very cool. I've always tried to maintain an organized =
supply of
various screw types and sizes which has been a huge asset. But it =
is not
always easy to get big boxes of the sizes you want any more. Most =
places
only sell the little 15 piece plastic packages (very =
expensive way to
buy screws).</FONT></SPAN></DIV>
<DIV><SPAN class=906561315-08012005><FONT face=Arial =
color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=906561315-08012005><FONT face=Arial =
color=#0000ff
size=2>Anyway, I have been wanting to do the plate suspension =
trick for
adjusting downbearing. Del spoke of it at the recent Indy =
conference. This
involves threading socket cap screws (headless bolts with recessed =
allen
socket) into the inner rim, running down a lock nut upside down =
with a
washer on top (a sufficient clearance well counterbored into the
soundboard), the plate lowered onto the washer, a chrome washer =
and acorn
nut on top. The height of the plate can then be easily raised or =
lowered
by removing the acorn nut and turning the stud with and allen =
wrench.
</FONT></SPAN></DIV>
<DIV><SPAN class=906561315-08012005><FONT face=Arial =
color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV class=OutlookMessageHeader align=left><FONT =
face=Tahoma><FONT
size=2><SPAN class=906561315-08012005>Attached is what I =
ordered. I got
the hanger screws just for fun. If the machine thread doesn't work =
well,
which Del said it would thread right into the wood, I can always =
fall back
on the hanger screws with their lag thread. =
</SPAN></FONT></FONT></DIV>
<DIV class=OutlookMessageHeader align=left><FONT =
face=Tahoma><FONT
size=2><SPAN =
class=906561315-08012005></SPAN></FONT></FONT> </DIV>
<DIV class=OutlookMessageHeader align=left><FONT =
face=Tahoma><FONT
size=2><SPAN class=906561315-08012005>Does anyone have a =
recommended hole
size to drill the rim for the 3/8" machine thread to screw
into?</SPAN></FONT></FONT></DIV>
<DIV class=OutlookMessageHeader align=left><FONT =
face=Tahoma><FONT
size=2><SPAN =
class=906561315-08012005></SPAN></FONT></FONT> </DIV>
<DIV class=OutlookMessageHeader align=left><FONT =
face=Tahoma><FONT
size=2><SPAN
class=906561315-08012005>Blessings,</SPAN></FONT></FONT></DIV>
<DIV class=OutlookMessageHeader align=left><FONT =
face=Tahoma><FONT
size=2><SPAN =
class=906561315-08012005></SPAN></FONT></FONT> </DIV>
<DIV class=OutlookMessageHeader align=left><FONT =
face=Tahoma><FONT
size=2><SPAN =
class=906561315-08012005>Dean</SPAN></FONT></FONT></DIV>
<BLOCKQUOTE><FONT face=Arial
=
size=2></FONT> </BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE=
></BODY></HTML>