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<DIV><FONT face=Arial size=2>Hi, Gene. Just like Ron said, be sure to put
tape on the finish, then mark the hole and drill. DAMHIK. Clark A.
Sprague, RPT</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=nelsong@pbic.net href="mailto:nelsong@pbic.net">Gene Nelson</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=pianotech@ptg.org
href="mailto:pianotech@ptg.org">Pianotech List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, November 13, 2006 9:07
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Drilling into
Polyester</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>Many thanks for the detailed insturctions
Ron.</FONT></DIV>
<DIV><FONT face=Arial size=2>I think that I will use my drill
press.</FONT></DIV>
<DIV><FONT face=Arial size=2>Gene</FONT></DIV>
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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=sec@overspianos.com.au href="mailto:sec@overspianos.com.au">Ron
Overs</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=pianotech@ptg.org
href="mailto:pianotech@ptg.org">Pianotech List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, November 13, 2006 1:43
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Drilling into
Polyester</DIV>
<DIV><BR></DIV>
<DIV>Gene,</DIV>
<DIV><BR></DIV>
<DIV>Drilling into polyester is quite straightforward using twist drills.
The trick is to have the drill bit very sharp with a lower clearance angle
than normal, so that it won't bite into the material too quickly. I
generally sharpen all my twist drills with a lower clearance angle than
standard. This helps to prevent the drill from pulling itself into the work
too quickly, with often disastrous results. As far as speed and feed rate is
concerned, I like to have the drill going fairly quickly with a light
application pressure. If the drill is razer sharp it will fall through the
poly like its cutting butter. I usually cover the area over the hole to be
drilled with masking tape before drilling. This helps to prevent any risk of
perimeter chip-out. When I'm drilling lids for fitting rubber buffers, I run
a couple of strips of wide masking tape on the panel adjacent to where I'm
planning to drill, to prevent scratching and scuffing of the surface with
the Portaline, which is the drilling attachment I use for holding the drill
square to the panel.</DIV>
<DIV><BR></DIV>
<DIV>While its easy to drill into polyester with low clearance angle drills,
I recommend that you drill or grind away a clearance-diameter of polyester,
down to the substrate, so that the mounting screws can't come into contact
with the polyester. Preventing the risk of a crack developing. Once you've
drilled your minor diameter hole for the mounting screws, you can cut away
the polyester to the substrate with a larger drill to ensure that there is
good polyester clearance from the outside diameter of the screw. This will
prevent any risk of a nasty stress crack running out from the screw hole at
some future time. Some caution is required when drilling away the poly to
provide clearance, since the larger drill, with no material at the drill
centre for control, can allow the drill to tear into the panel unless the
feed pressure applied is very light. Another approach might be to drill your
hole clearance first, being careful not to drill it too deep, then following
it with the minor diameter drill. I generally don't drill the clearance away
first, because it increases the risk of drilling the minor diameter hole off
line. If you've got some tungsten carbide grinding balls and a die grinder
handy, using these can be lot safer way of providing clearance for the screw
after drilling the minor diameter hole, without risk of tearing up a piece
of polyester.</DIV>
<DIV><BR></DIV>
<DIV>Ron O.</DIV>
<DIV><BR></DIV>
<BLOCKQUOTE cite="" type="cite"><FONT face=Arial size=-1>Have a client
that wants the 9"x1" hinge installed on the music rack - it originally
never had one "</FONT></BLOCKQUOTE>
<BLOCKQUOTE cite="" type="cite"><FONT face=Arial size=-1>The piano has a
high gloss polyester finish along with some very fancy veneer on the music
shelf.</FONT></BLOCKQUOTE>
<BLOCKQUOTE cite="" type="cite"><FONT face=Arial size=-1>Drilling into
poly makes me a bit nervous - never did it before, expecially in such a
visible area of the piano -</FONT></BLOCKQUOTE>
<BLOCKQUOTE cite="" type="cite"><FONT face=Arial size=-1>Is there a
technique that someone uses to dimple the spot to drill so that the poly
will not split, or to prevent the dirll bit from wandering? Accuracy
is a must.</FONT></BLOCKQUOTE>
<BLOCKQUOTE cite="" type="cite"><FONT face=Arial
size=-1>Regards,</FONT></BLOCKQUOTE>
<BLOCKQUOTE cite="" type="cite"><FONT face=Arial size=-1>Gene
Nelson</FONT></BLOCKQUOTE>
<DIV><BR></DIV>
<DIV><BR></DIV><X-SIGSEP><PRE>--
</PRE></X-SIGSEP>
<DIV><FONT face="Times New Roman" color=#0000ff size=+1><B>OVERS PIANOS -
SYDNEY</B></FONT></DIV>
<DIV><FONT color=#000000><I> </I></FONT><FONT
color=#0000ff><I>Grand Piano Manufacturers</I></FONT><FONT
color=#000000><BR>_______________________</FONT></DIV>
<DIV><FONT color=#000000 size=-2><BR></FONT><FONT color=#000000>Web
http://overspianos.com.au</FONT></DIV>
<DIV><FONT
color=#000000>mailto:ron@overspianos.com.au<BR>_______________________</FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>