Feel Silly Asking This Question Alignment Parameters

@dover  : No, that was finger error.

Even that the calculations for the P2S 222mm shows at that firstlink I posted and the EL calculations shows 239.3 for that P2S. Numbers says that's the correct EL not 239mm., numbers are numbers/mathematics.

OLsays in his site:  " Centre of mounting hole to centre of platter should be 222mm (plus or minus 1mm tolerance). "

It's not talking of overhang.

Now, if the P2S distance change to 221mm or 223mm over calculations at the same time changes the overhang and offset angle and the main target for any tonearm owner is to make the tonearm/cartridge/TT alignment with Accuracy and this is what I'm talking about.

Anyway, that 239mm or 9.5" stated by OL can't be achieved with the OL information.

So other that my finger error I think I'm not wrong.

Maybe what created some kind of confusion in my posts was that my " error "I wasthinking that the OPwantsit 17.5mm as overhang.

" Apparently you think its fine to set up tonearms with an accuracy of +-0.3mm "

You did it not me,so don't put words in my mouth.

R.

@lewm you know I meant the wavelength of the tracing, obviously the wavelength in air does not change.

" Apparently you think its fine to set up tonearms with an accuracy of +-0.3mm "

You did it not me,so don't put words in my mouth.

Actually you suggested mounting the arm 3mm out of manufacturers specs.

Here is your actual post.

rauliruegas

12,992 posts

08-27-2024 at 06:03am 

@dover : No it’s not wrong because OL says a margin of +,- 2mm. In the other side we can change those numbers with out any negative consequence because 225 means longer EL and les distortion.

The manufacturers specs are 222mm - you are suggesting mounting it at 225mm.

That would mean pushing the cartridge out further, significantly increasing the effective mass and inertia of the tonearm beyond what the designer intended.

It's no wonder you have suggested your 1980's CD player is more accurate than your turntable system.

Given that you have been trying to build your own tonearm for the past many years, perhaps you could now focus on a design with an effective length of 48 inches - according to your theory that would sound fantastic - even lower distortion. Pity the poor cartridge though, trying to cope with such vast effective mass whilst navigating  eccentric records.

Dover, I’m not quite sure what the argument is really about but my calculations suggest that a change in EL from 222mm to 225mm would increase effective mass by only about 2%.

@dover : It's curious/negative that you took from my posts only what ssome way or the other you can use as a weapon.:

Iposted this information that came from VE but maybe you don't read it or let pass on purpose:

" 

 " This document is reproduced here by kind agreement of Mark Baker at Origin Live. "

" Rega arms and Origin Live arms require mounting dimensions such that the centre of the platter to the centre of arm hole is approx 223mm plus or minus 2mm tolerance and the hole diameter for the arm is 24mm to 25mm. "  

So that's not my information, I only pasted and used.

R.