Pinblock Drilling Centering

[David Love]

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I've used a hammer shank for swabbing.  Dip it in the fluid, let it run =
off and swab the inside of the hole.  You don't really need that much.  =
Swabbing the upper end of the hole is enough and let the pin drag the =
fluid down with it.  You don't want it running out the bottom.  If you =
dip the pin and are using plate bushings, the stuff will get all over =
the place. =20

David Love
  ----- Original Message -----=20
  From: Erwinspiano@aol.com=20
  To: pianotech@ptg.org=20
  Sent: October 25, 2002 7:22 AM
  Subject: Re: Pinblock Drilling Centering


  In a message dated 10/25/2002 5:05:10 AM Pacific Daylight Time, =
RNossaman@cox.net writes:



    >           =20

    I've heard plenty of good things about pin driving fluid, but =
haven't tried=20
    it. I drill the block in the piano, and haven't been able to picture =
a=20
    method of getting the varnish into the block without spending half a =
day,=20
    getting it all over the plate and bushings, or both. If you get away =
with=20
    drilling Delignit that far undersize, with one pass, and get a good =
uniform=20
    pin torque that doesn't twist the pins off, it's probably because of =
the=20
    varnish. So tell me, how do you get the varnish in the block without =

    getting it all over the plate? Maybe I'm just neatness challenged.

    Ron N


              My recent driving fluid experiment were on pieces of block =
out of the piano and have yet to do it in the actual process. I've got =
the messy thing too but from what friends have said is they swab a =
couple rows of pins at a time, string ,swab more holes. It doesn't take =
a flood of solution to make this work. You can even dip the pin in the =
varnish, let it drip off then drive it in I would think. Probably easier =
said than done but One other technique was to cut a slot in a hammer =
shank and insert a piece of key bushing cloth  wider than the shank but =
smaller than the hole, dip it in the solution, then spin the device in =
the hole. You know I bet Joe Garrett has some fancy fangled trick, he's =
a neat freak guy ,right Joe? How about a hypo oiler. Put some drops =
around the top of the hole then us! e something to swab
     So As I now understand it for a no. 2 pin fit in delignit, you bore =
with drill sizes that are only a couple thous. different so the final =
reaming isn't going to change the accuracy of the first hole drilled =
it's just cleaning it up.
        Dale E.


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