Author: Dan Shusta
Date: 2022-10-02 03:42
To Mojo and JTJC,
Thank you both very much for your knowledgeable and experienced responses.
What I'm really trying to say is, from my point of view, both of you were challenging me and I'm glad that both of you did.
And, what was that challenge? I interpreted both of your responses as saying to me: "Can I really trust my eyesight to determine where the curve actually begins?"
And, now, the answer to that is a definite NO!
I resorted to the "light begins the curve" concept because I sincerely believed that it did. And now, I must admit that I was totally wrong.
I took another look at my Prescott. Only this time I looked for where the cutting may have started and..........I found it! After I did, I put a piece of white paper across the outer edges and then placed my plastic ruler against the paper. I then read the mm number at the tip. Now, I measured 19mm.
So, to sum everything up succinctly, the beginning edge of a sliver of light is not the beginning of the curve. Why? Because I have proven to myself that my eyes cannot see light shining through an opening of less than 0.0015".
Actually, I'm glad that I was wrong. Why? Because (for me at least) my faith in CNC machined mouthpieces has been restored. Proper CNC machining actually does produce a 0.0015" opening at the specified facing number listed for the mouthpiece.
Also, when it finally dawned on me that I have memory problems, I took my 0.0015" feeler gauge and placed it between my JJBabbitt glass measuring gauge and the mpc facing and..... I slid it all the way down to 36.
Mea culpa.
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The Clarinet BBoard
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