centered on a tool

[cdant1]

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There is a formula for calculating centerpin size it is as follows  Mic =
reading - 10 /2 =3D pin size ( .053 - 10/2=3D 21.5)
I usually will go up to  size 22 before replacing bushings, it is just a =
preference. Once you have to start reaming the birdeye, it is just as =
much work as replacing a few bushings. If the birdseye gets too big, it =
requires sizing if you ever decide that you would like to rebush and go =
back to a smaller pin. - Chris
  ----- Original Message -----=20
  From: Joe & Penny Goss=20
  To: pianotech@ptg.org ; caut@ptg.org=20
  Sent: Tuesday, August 21, 2001 6:24 PM
  Subject: centered on a tool


  Hi all,
  In measuring center pins I have discovered that my pins do not always =
increase  in increments of .001=20
  They go #18 is .046#18.5 is .047     #19 is .048     19.5 is 49     =
#20 is 50    # 20.5 is 51      # 21 is 52     #21.5 is 53    # 22 is 54.
  I do not have any 22.5  pins but presume that they are .055 becuase =
#23's are .056 and no #23.5 pins and wonder the size for the #24 pins =
are.059 No #24.5 and then #25 is .063 and no #25.5 and the last pin size =
26 is .066
  The break in size progression seems to be between size #23.5  and size =
#24
  Question 1. are my missing center pin sizes available?   #22.5,   23.5 =
and 24.5?
                   2. are these larger sizes used by many? {#22 and =
larger}
                   3.At what size do you deide to rebush rather than =
repin?
                   4. If larger accurate reamers were available would =
you think of using a larger pin size?
  Joe Goss
  imatunr@srvinet.com
  www.mothergoosetools.com

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