Vinyl Asylum

RE: Ken Willis Protractor - Which Mounting Distance?

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A

In Reply to: RE: Ken Willis Protractor - Which Mounting Distance? posted by bjh on January 26, 2015 at 15:33:21

This is the protractor I settled on. BTW, I measured the pivot to spindle
distance to be 211 mm which verifies VE's spec for the PT6 tonearm.
Protractor #1 calls out 210 mm as the mounting distance. To be honest, my
57 yr old eyes could not distinguish much difference if any between the 210B and 211B traces. I did use a magnifying glass but perhaps I should
enlist a younger pair of eyes to be sure the alignment is correct.

Follow Ups:

RE: Ken Willis Protractor - Which Mounting Distance? - bjh 16:31:10 01/27/15 (0)
Thanks! I always wondered how his customized (for specific arm) protractors differed from the "Universal" version that was once available for download from the Vinyl Engine (no longer is).

The Universal version has a straight guide line is used to position the protractor itself, which is fixed in position when the projection of that line passes through the center of the arm's pivot. Thus fixed alignment is then done in normal fashion; it has grids for Baerwald an the other two common schemes.

I wonder how universal it actually is, and I imagine a custom version for a specific pivot-to-spindle distance is best, yet I must say I obtain good results that seem quite consistent with alignments done on one of my tables that has its own custom protractor.

[Just to be entirely clear, the customized protractor doesn't have the guide/positioning line mentioned, now I understand it doesn't need it.]
It does not really matter, they both kinda wrong - Penguin 21:09:56 01/26/15 (0)
according to the formulas you are in between 210 and 211 mm for both Lofgren A and B :). I would bet you could not tell any difference between the two protractors :) The diamond mounting has probably more errors.

dee
;-D

True terror is to wake up one morning and discover that your high school class is running the country.

quote by Kurt Vonnegut

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