Double drilling pinblocks: Hand held versus drill press.

[Farrell]

z'Rather than getting obsessed with a few looser than I'd
like,  I give them the ole ca (crazy glue) treatment."

On a new pinblock??????????????????????????????????

Terry Farrell

----- Original Message ----- 
From: "Carl Meyer" <cmpiano@comcast.net>
To: <davidlovepianos@earthlink.net>; "Pianotech" <pianotech@ptg.org>
Sent: Sunday, February 08, 2004 2:40 PM
Subject: Re: Double drilling pinblocks: Hand held versus drill press.


>
> David, I've drilled a block or three free hand, but not double drilled.
> Before I built my pinblock drilling machine, I did turn an upright on it's
> back, fill the pin holes with epotec epoxy and then drill the holes by
hand.
> The drill size was enough to use oversize pins (Don't remember the sizes
> involved).  I considered it successful, but no amount of ingenuity and
> foresight on my part has resulted in perfect torque no matter what
procedure
> I've tried.
>
> My gut feeling is that double drilling by hand would be iffy and I
wouldn't
> think accuracy would be improved.  I'd speculate that making the first
drill
> no more than maybe 2/3 the final diameter would give the second drill a
> better chance of alignment by hand.  That would then eliminate the heating
> effect.  The drill I used had a bubble to hold the drill perpendicular.  I
> think that helps.
>
> I recall asking Willis Snyder many years ago if double drill pinblocks was
a
> good idea.  He said
> "That works with metal but not wood."  I wish I'd asked him why.
>
> Sometimes I'm surprised at how well pin block torque works in spite of all
> the variables.  Rather than getting obsessed with a few looser than I'd
> like,  I give them the ole ca (crazy glue) treatment.  It's only
guaranteed
> for life anyway.  That's my life of course.
>
> Carl Meyer Ptg assoc
> Santa Clara, Ca.
>
>
> ----- Original Message ----- 
> From: "David Love" <davidlovepianos@earthlink.net>
> To: "Pianotech" <pianotech@ptg.org>
> Sent: Saturday, February 07, 2004 2:13 PM
> Subject: Re: Double drilling pinblocks: Hand held versus drill press.
>
>
> > I'm not sure we're talking about the same thing.  I'm refering to
pinblock
> > drilling in two passes.  If your final bit size is to be .261", then you
> > predrill at .250" and on a second pass, drill the remaining .011".  On
the
> > second pass, because so little material is taken, you don't have to
worry
> > about feed speed and the drill heating up.  My question is whether that
> > allows you to drill with a hand held and still be accurate without
> > enlarging the hole.
> >
> > David Love
> > davidlovepianos@earthlink.net
> >
> >
> > > [Original Message]
> > > From: Michael Gamble <michael@gambles.fsnet.co.uk>
> > > To: <davidlovepianos@earthlink.net>; Pianotech <pianotech@ptg.org>
> > > Date: 2/7/2004 1:46:50 PM
> > > Subject: Re: Double drilling pinblocks: Hand held versus drill press.
> > >
> > > Hello List and David L
> > > In the metal engineering world there is an old "dodge" that by
initially
> > > sharpening a drill bit so that one cutting face is longer than its
pair,
> > the
> > > bit can be made to cut oversize. How does this help? It follows
> therefore
> > > that the drill you use to cut a "hole-in-one" must be very accurately
> > > sharpened. You can get away with this to a degree by using a
"roughing"
> > > drill followed by a "finishing" drill. In an earlier post I suggested
> that
> > > to make a drill cut more precisely to its stated size the cutting
> corners
> > > should be rounded off. OK?
> > > Michael G (UK)
> > >
> >
> >
> >
> > _______________________________________________
> > pianotech list info: https://www.moypiano.com/resources/#archives
>
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>