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<title>Re: Machine Threads in Pinblock, was WD-40</title>
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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hi Terry:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>This is ever so slightly off topic at hand, but I’ll run
with it anyway. I’m going to be using the 3/8” x 16 thread x
4” long socket set screws for plate screws as you, Ron, Del, and others
are doing. What size drill bit are you using to drill the hole in the
rim? (or drill the plugs glued in the holes, as it were). Are you
tapping afterwards? What size tap if so?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I was able to get these screws, acorn nuts, etc at my local <i>Fastenal.
</i> One inch round brass stock as well for mass loading. I mention this
for others, as there are supposedly 4000 of these stores in the<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> U. S., so you may just be able to run down the street
instead of mail ordering. Lots of other stuff there that us weird
piano rebuilders might use or adapt, and they have a huge catalog. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Also, these 3/8” screws miked out at .369 instead of the
.375 that 3/8” works out to. Does that differ from your stock?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Thanks for your help!<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Will Truitt<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>By the way, I think this set up is absolutely brilliant in its
simplicity and application. Kudos to Del and Ron for coming up with it.<o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>Hi Ron!
I also use coarse thread as you do. However, I have tried tapping the maple and
found that it made the hole too big - I used the proper tap for the given
machine screw. I figured that the maple must have enough give in it (compared
to metal), that caused the poor fit. I've gone to simply drilling a hole a
little smaller than the thread and simply running a buttered (wax) machine
screw into the hole (just like one does with a wood screw). I seem to get the
nice tight fit that way. Do you find that you machine screw have a snug fit
after tapping the hole?</span><o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>Terry Farrell</span><o:p></o:p></p>
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margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>
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<p class=MsoNormal>Fenton,<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>.
. . Would you recommend a fine or coarse thread?</span><o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Always
course threads in wood. We use the regular tapping tools after drilling the
minor diameter.</span><o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Ron
O.<span style='color:#1F497D'><o:p></o:p></span></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>You can make a “tap” from the threaded rod you
intend to use: drill your minor diameter holes as planned. Put about a 45
degree angle on the end of a piece of the threaded rod just enough to be less
than the minor diameter hole to form a lead on your rod just like the lead on a
machined tap. Looking at the rod from the end: visualize the end to
be divided into quarters with an “X” that gives you a north-south,
east- west configuration. Grind a trough in two opposite quarters with one
edge parallel to the north-south line, and the other edge parallel to the east-west
line. A square edge on a grinding wheel does a tidy job. The trough
must be deeper the minor diameter of the thread and taper to infinity, about ½”
long. Put a suitable handle on the other end, and “tap” your
holes. This also works great for chasing damaged threads. Your threaded
rod will fit better than using a machined tap.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Paul C<o:p></o:p></span></p>
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