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Tonearm Alignment Geometry...

Posted by John Elison (A) on October 7, 2015 at 20:15:17

There are some fairly simple equations that describe the geometry of all pivotal tonearms in terms of effective length, pivot-to-spindle mounting distance, offset angle, and alignment null-points. I have posted these equations a number of times:

Sometimes tonearm manufacturers publish parameters such as effective length, pivot-to-spindle mounting distance and offset angle without providing the alignment null-points. If you would like to calculate the alignment null-points there is a quadratic equation that can be solved as shown below:

For example, suppose you know the following parameters:

Pivot-to-Spindle Mounting Distance = 258-mm
Effective Length = 273.4-mm
Offset Angle = 19.98-degrees

Using the above equations, you can easily determine the alignment null-points to be:

N₁ = 70.1-mm
N₂ = 116.7-mm

A graph of this alignment would look like this:

Edits: 04/16/17

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Kimber Kable

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