2-point protractor generator





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Instructions

2-point protractors are universal protractors for turntable cartridge alignment that can be used with any record player (as long as the slots in the headshell are long enough for the alignment geometry you choose).

They are not as easy to use as arc protractors, but knowing the exact pivot to spindle distance of your turntable will not be necessary. The 2-point protractor will still allow you to set the overhang precisely for your turntable, according to the chosen alignment geometry.

Please note that the resulting overhang and offset angle may be different from the stock specification chosen by the record player manufacturer.

If you have no idea about the technical intricacies of turntable geometry, do not worry. The pre-set values should be fine for most users.

It is recommended to print the 2-point protractor onto glossy photo paper to protect your stylus. Alternatively, a piece of clear packing tape stuck onto the target points will do the trick as well. You may also laminate the cartridge alignment protractor.

Please make sure to print out the alignment template at 100 % scale (to be set in the printing dialogue of your browser or operating system). Measure the outer rectangle to be sure it is exactly 190 mm long. If it is not, you can scale the template by changing the printer correction factor.

Cut out the protractor and make sure to punch or cut the hole as precisely as possible.

Place the alignment protractor on your turntable, set anti skating to zero and the vertical tracking force to a lower weight than you would normally use with your stylus.

Loosen the screws that hold the cartridge in place just enough so you can move it, but cannot move on its own. Set the stylus precisely onto the outer grid’s center point. Lift the tonearm and adjust the cartridge’s angle until its front is parallel with the grid. If the front is flat, taping a pencil lead to it will help to make a more precise adjustment. Instead of aligning the cartridge with the grid, aligning the cantilever to the center line of the grid is also possible.

Then check your cartridge alignment on the inner grid. You will have to move the protractor to do this. If the cartridge is at an angle here, you will need to adjust the overhang according to the following illustrations:

Instructions - when to increase overhang Instructions - when to decrease overhang

Then start again on the outer grid. Repeat until the cartridge is aligned correctly on either grid. Then tighten the screws and do not forget to set the tracking force and anti-skating back to the weight specified for your stylus.