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In Reply to: RE: Help with SS Zephyr MIMC and VPI 3D Arm Please! posted by bill_stevenson@bellsouth.net on October 18, 2016 at 08:11:28
What method did you use to arrive at such a precise S-P distance?
Follow Ups:
Because the 3D tonearm is a unipivot it is easier. Remove the tonearm and then use either a steel tape (Stanley makes a nice one) or even better, a high quality steel ruler and measure pivot point to center of spindle. This is not difficult to do at all.
You may find it easy to do and I don't doubt your measurements to half a millimeter of precision, but I don't find it easy nor do I share your confidence. I tried measuring with both my platter and tonearm removed. I am not about to lay a metal anything against the platter bearing or the tungsten tip. Even if I did, there is a height difference which will throw off the measurement. So I feel my best efforts only provide an estimation. In my case I got 257.2 mms but it all depended upon how I sighted down vertically from my rule to the bearing center and pivot point-not something that can be done with engineering precision IMHO. This is why Mr. Ellison posted about his method which calls for measuring the height difference and subtracting out the hypotenuse (IIRC).
There is no need to sight down vertically. Lay your ruler on the top of the spindle to the top of the unipivot and make a measurement. Next lay your ruler on top of the unipivot level with the platter and measure the height from the spindle to the ruler. You now have two sides of a right triangle, the hypotenuse, "c" and the short side, "a." Apply Pythagorean's theorem.
b 2 = c 2 - a 2
I believe you can make a very accurate measurement of spindle-to-pivot mounting distance in this manner.
Good luck,
John Elison
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