Multiple arms, multiple cartridges and geometry?

Dear Halcro: I see The Reason but my question is: do you already try to set up your removable headshell tonearm designs at 225-227mm on Löfgren B geometry?

Regards and enjoy the music,
R.

Dear Halcro: To do that, fully interchangeable, you need that those tonearms share same effective length and if not then you need to " force " all tonearms on the choosed efective length.

Remember that's the effective length where those tonearm geometries moves around.
All those calculations takes as main parameter the effective length and then through its equations achieve the overhang and off-set angle and by difference the spindle to bearing center distance.

I hope this can help.

Regards and enjoy the music,
R.

Dear Halcro You ask for full interchangeability between your removable headshell tonearms you own noty that " looking good ".

Do you already tested to mount your three tonearms at 225-227mm with Löfgren A/B geometry set up?

Regrads and enjoy the music,
R.

Dear Halcro: I think that I don't explain to good or that you did not understand what I posted, here again:

first I don't know why you want differnt geometry alignment for each tonearm ( Baerwald, Stevenson, L¨fgren or what ever. ).
If you need full interchangeability you must choose one geometry alignment for all tonearms.

When we choose in that way, example: Löfgren B, even if the tonearm effective length is different from each tonearm we can force the calculations to one effective length for all the tonearms, in this way the overhang and offset angle will be the same to all tonearms and with full interchangeability.

Subject is to choose the " right " effective lenght value that permit the cartridge overhang set up for all tonearms. So, if for example you choose: 260mm that means that all tonearms must be mounted to conform that effective length minus the calculated overhang.

This could do it or not depending how large are the true tonearm efective lenght differences between each of the four tonearms. So, not always is possible to have that full interchangeability.

Regards and enjoy the music,
R.

Dear Halcro: Why not align all the removable headshell tonearm designs at 225-227mm according Löfgren A or B calculations?

You could try that: same tonearm effective length, this means same overhang and same offset angle with different tonearm spindle to tonearm bearing mount distance.

Regards and enjoy the music,
R.