Set Overhang on arm w/adjustable tracking angle

Garibaldi,

You may not have set up many cartridges but you came to a good place. There are many experienced vinyl-philes here. I've set up several arms with single-point mounting schemes like your Satisfy. It's actually easier than a two-slot headshell once you get the hang of it, but it does need some practice.

I don't think I can set the overhang unless the Lofgren alignment is achieved, but I can't set the Lofgren alignment until the overhang is measured... Is this a case where I just have to adjust both alignment and overhang until I measure 14mm overhang and the correct Lofgren alignment?

That's exactly right. Overhang and zenith angle (what you're calling "tracking angle") are interdependent. Changing one alters the other and vice-versa, so we adjust them iteratively:

1. Adjust one parameter
2. Check both parameters after each adjustment
3. Adjust whichever one is more out of whack
4. Repeat steps 2-3 as many times as necessary; you'll find yourself making progressively smaller adjustments as you zero in toward ideal alignment

(Yes, it's possible to tweak one parameter while simultaneously counter-tweaking the other to compensate... this may come with practice.)

IMPORTANT - what tools are you using? Trying to align a cartridge without a suitable alignment protractor is nearly impossible.

The easiest-to-use and most accurate protractors are called "arc protractors". They include a printed or scribed arc that the stylus should follow as the arm swings across the record. They also include several alignment grids spaced along the arc. Once overhang is right (i.e., the stylus is accurately tracing the arc), set the stylus on the grid, view from the front and twist until the cantilever is square to the grid. Voila!

Free downloadable/printable arc protractors for many tonearms are posted at vinylengine.com. For a higher quality result, you can purchase a first class protractor from MintLP.com. Many here (including me) use Mint protractors with excellent results on a wide variety of tonearms. If you had a good arc protractor, all your questions would be answered. :-)

Hope this was helpful...

Doug, if the screw holding the cartridge mounting plate is directly above the stylus, would rotating the cartridge change the overhang? I follow your post and it makes sense to me in every case except the one I mention.

It seems to me that if the cartridge is being rotated along a zenith axis which corresponds precisely with where the stylus tip meets the LP, overhang becomes determined only by the position of the arm pivot point.

I find cartridge zenith alignment to be one of the key advantages of the Mint LP protractor. It is very easy to align the cantilever with the tangent lines at the null points.

Garibaldi,
Doug has has given an excellent summary. The only point I would make is that your arm should have 17.31mm overhang not 14mm.

Peter,
It is interesting that few of the current arms with the facility to rotate and slide the cartridge choose to do as you suggest. It seems an obvious design advantage, particularly if the two movements are kept separate. It is, of course, simpler and cheaper to combine the two functions on a bar between the cartridge mounting holes.

John

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