Hi Keith
I bought a Jumbo Java 90 to compare against my old one (with your
facing suggestion.)
Even with my errors, the old one is hands down better...So I lapped 
the new one, and plugged the numbers into your spreadsheet...
I can get it to display the harsh break, but am unable to get it to 
suggest a new target...
In the hope that I've not already worn out my welcome, I've included 
the new facing numbers...
0015.......14.5mm
10.........12  mm
24.........8.5mm
35.........7.6mm
48.........5  mm
63.........2.6mm
Tip 85 @ 1.5mm
If you have some time I'd appreciate your advice again.
Ross

> the new facing numbers...
> 0015.......14.5mm
> 10.........12  mm
> 24.........8.5mm
> 35.........7.6mm
> 48.........5  mm
> 63.........2.6mm
> Tip 85 @ 1.5mm
> If you have some time I'd appreciate your advice again.
> Ross

I just added a new file in the Tenor Sax area titled "...message 
3077".  It has a plot of your readings and the targets below for a 
curve of best fit:

14.9
11.6
8.6
6.8
5.1
3.4

Your readings look a little too zig-zaggy when plotted.  Unless its 
been worked on, Vandorens should look a lot better than this.  

I did that too fast.  You should not use those target numbers.  I 
just realized that you already lapped the table so the .0015" reading 
is way short now.

What you need is a curve that goes through a more normal facing 
length, like 46 = 23mm, and also passes through your tip opening 
of .085", if that is what you want.  You gave a tip rail width of 
1.5mm.  That is a on the fat side.  0.75 to 1 mm is better.  I'll 
use .085" at 1mm.

See the second tab of that same spreadsheet ("Good") for these 
targets based on your feeler set:

23.0
17.6
12.9
10.1
7.3
4.5

Thanks you so much Keith...
I will have my spreadsheet skills up to speed soon, but in the meantime, I'll be able to advance my passion to the next level.
Thanks again.
Ross


  ----- Original Message ----- 
  From: Keith Bradbury 
  To: MouthpieceWork@yahoogroups.com 
  Sent: Monday, March 21, 2005 3:14 PM
  Subject: [MouthpieceWork] Re: Facings



  I did that too fast.  You should not use those target numbers.  I 
  just realized that you already lapped the table so the .0015" reading 
  is way short now.

  What you need is a curve that goes through a more normal facing 
  length, like 46 = 23mm, and also passes through your tip opening 
  of .085", if that is what you want.  You gave a tip rail width of 
  1.5mm.  That is a on the fat side.  0.75 to 1 mm is better.  I'll 
  use .085" at 1mm.

  See the second tab of that same spreadsheet ("Good") for these 
  targets based on your feeler set:

  23.0
  17.6
  12.9
  10.1
  7.3
  4.5






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