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Mounting hole-to-stylus variation / tolerance

Hi all,
I know this particular point has been touched on, raised, in some of the threads dealing with tone-arm-alignment in particular.
I truly think it deservers a dedicated thread since it has a more or less profound influence on various arm designs and their alignment.
It also has a profound influence in how accurate and beneficial any after market alignment tool will work for you!

We have had this far, feed back from Jonathan Carr, i.e. the variations and tolerances with regard to his product (Lyra).
We also had some rather powerful insights by Frank ..., who designs and makes arms i.e. the variations of various products he took note of.

Jonathan quoted, that his current products have a +/- 0.3mm tolerance from the 'standard' IEC...? of 3/8" or 9.52mm.

The findings of some contributors are different, possibly due to simple variations much greater than 0.3mm (Lyra's tolerance) or possibly due to subsequent movement of the 'motor' relative to the body, caused by rough handling, re-tipping, etc.

It is of most importance to get more feedback on this, due to the dependence of a close match to 9.52mm, on arms such as ALL of SME, to name but one. These rely on this to be fairly accurately aligned. If not, some pretty unacceptable misalignment follows as a result, if the stock alignment method is used.

Lastly, HOW can a 'normal' end-user measure this distance with some degree of accuracy?
I have no problem using a vernier (calliper) and measure a +/- 0.05mm variation.
I can not see that this tool will be of use in this case. Optical measurement (like tool-shops use) will be best I should think --- but who, I ask, has this at hand?

Greetings,
Axel
axelwahl
axelwahl OP
788 posts
 
Hi Dan_ed
you say:
>>> If you change the cartridge, all you need to is move the cart in the mounting holes until the stylus hits the arc again <<<

You obviously didn't take note of, that we are talking about a SME V in my specific case, and the case I've been talking about i.e. ... "IF" my p2s comes to 233.15mm! plus +++ No need to mention the arm, since that spec is too well known by now, or? :-)+++

Seems there was a need to mention it after all.

In the case of 'fixed' arms there is no: "move the cart in the mounting holes" therefore one HAS TO RELY ON some reasonable proximity to 9.52mm s2mh...

You are OF COURSE right, that for arms other than that, it could be considered a mute point ---- until your mounting holes run out of adjusting space i.e. with some arms using an e.g. a Dynavector 17D3 Karat Cartridge.

Greetings,
Axel
dan_ed
2,451 posts
 
Axelwahl,

I can't do this with you anymore. Your threads always end up as some vague argument where you change the subject to promote some, as you see it, thought provoking concept.

If you have always intended this thread to be about your SME I do wish you had stated that in the thread title.

Best to you,

Dan
axelwahl OP
788 posts
 
Oh my,
if a s2mh is a mute issue to you, so why do you bother at all?!
Isn't it YOU that is now promoting a particular arm concept, which then makes this enquiry NONSENSICAL?

Sounds like some ego trip to me. Closed case for you, fine. I was just trying to get you to understand that it is NOT a mute issue - yet.
There are OTHER 'fixed' arms made in this world then SME e.g. Linn and Origin Live I'm told.
You make the issue mute, I say not so, unless you come up with something more convincing than 'mute issue' because it's not your case... or you just want to right?
Please kindly consider this at least.
Thank you,
Axel
dan_ed
2,451 posts
 
Ok, bye.
dertonarm
1,042 posts
 
Dear Berlinta, rest assured - I got from the 3 samples what was possible. I just wasn't impressed. That was not a problem of the respective set-up nor of my abilities. As for the sientific dispute and my non-reaction to your mathematical and physical "facts" - I reacted and answered.
It just wasn't posted.
The dispute about the TT drive mechanism between the "gang" and me some weeks back gave a good example of my phrase about Galileo. If your and the comments of your gang-members regarding drirect drive vs. belt drive were indeed serious - than I am definitely Galileos legal successor.

But thanks for your extensive viae vitae anyway.
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