Multiple arms, multiple cartridges and geometry?

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.

Henry - for the arms you use that have detachable headshells, surely if you use a headshell that has slots, hence the ability to alter the overhang and alignment, then you can set each cartridge up and the only changeover issues would be tracking weight and VTA. I use to build easy VTA adjusters by tapping a metal block and using a fine thread screw to put under the arm lift. If you recorded the optimum for each cartridge/arm then it becomes easy to adjust.
Failing all this - buy 2 more TT's & enough arms and you can at least get 24 of your cartridges running simultaneously.

Dover,

and the only changeover issues would be tracking weight and VTA.

That's what I thought and the principle I have been operating under?
However.....I fear that is not the case?
The effective lengths and overhangs being different for all my arms......means the arm geometry is not easily transferable?

Raul,
I agree that I need to accept the same geometrical alignment for all the arms I wish to use with detachable headshells......say Baerwald?
I can appreciate that I can adjust the P to S distance of each arm so that the 'Overhang' can be the same.......but I don't see how I can adjust the effective lengths between 222mm, 230mm or 295mm to be the same? :-(

Can you possible explain a bit more thoroughly?

Cheers
Henry

Nandric nailed it.

Get to work, and you might as well enter the S2IG (spindle-to-inner groove) dimension in a searchable database while you're at it.

Dear Henry, Sorry, I overrated my Sliwowitz capacity. My
consideration was: the distance between the lead out
groove to the spindle differ by the most LP's. Depending from this distance Stivenson and Bearwald will give different inner 'O' points which means that one will be
more optimal than the other in (co) relation to the LP
you intend to play. You can estimate the distance or measure and then decide which tonearm (aka geometry) to use. Ie the geometry is primary about the records and only
'indirectly' about the tonearms.

Regards,