L75 Tonearm? WHO designed this flawed arm?

[Cafe latte]

Chris, I think that they're all good solutions. I just wanted to try this low-tech approach because I can do it.

I have the ball bearing parts too, which would have to be adapted. I need to think about roller bearings regarding centering, end friction, etc. In railroad application, I know that a tapered roller design has been successful. I believe that this has a self-centering action.

Anyway, that was my logic.

I dont think centering should be an issue as if the bearings as they should be are an interference fit to the shaft then there should be no lateral play.
Regards
Chris

[Rotsch]

Say you what !!!!!

In between i've changed to a Micro Seiki...
http://www.lencoheaven.net/forum/index.php?topic=11544.msg177748#msg177748

MAYBE...there're a hell of other drop in's maybe better or worse...
BUT...i came back when i's playing around with stacked platters....
http://www.lencoheaven.net/forum/index.php?topic=12037.0

The good ol L75 tonearm gimme more then i've ever expected !!!

THIS original tonarm is NOT flawed or crap or anything you mean.....
WHO said that !!???
With new v-blocks,the right allignment/arrangement (maybe a new wiring) and a lil bit of sensitivity...
it's a great playing/scanning arm !!!!
It just needs somekind of attention !!

Just my 2cents !!!  

Edit:
Some impressions.....
http://www.lencoheaven.net/forum/index.php?topic=11086.msg171825#msg171825



   

[fetteler]

Say you what !!!!!

In between i've changed to a Micro Seiki...
http://www.lencoheaven.net/forum/index.php?topic=11544.msg177748#msg177748

MAYBE...there're a hell of other drop in's maybe better or worse...
BUT...i came back when i's playing around with stacked platters....
http://www.lencoheaven.net/forum/index.php?topic=12037.0

The good ol L75 tonearm gimme more then i've ever expected !!!

THIS original tonarm is NOT flawed or crap or anything you mean.....
WHO said that !!???
With new v-blocks,the right allignment/arrangement (maybe a new wiring) and a lil bit of sensitivity...
it's a great playing/scanning arm !!!!
It just needs somekind of attention !!

Just my 2cents !!!  

Edit:
Some impressions.....
http://www.lencoheaven.net/forum/index.php?topic=11086.msg171825#msg171825



   

Roger,
I absolutely 100% wholeheartedly agree with you. 
There's a herd mentality surrounds the sound of this arm.
 

Steve.

[guiller]

I begin now the process of thinking thru how to "fix" one that is sagging badly. Certainly I will come up with something better than dental floss and glue

Did anybody use teflon tape instead of dental floss? 

[richard]

I feel that the Lenco arm is a mixture of good and bad. So, my approach is to save what's good and replace what isn't.

The problem with fooling around with the original de-coupling arrangement is that this was originally designed using a mathematical formula regarding the flexibility/vibration rate, etc. I've never seen anyone talk about this in print.

Many arms have incorporated de-coupling. Many of the cheap "S"-armed Japanese turntables from the 70s and 80s had de-coupled weights. Turntables that incorporated brainpower, such as the good Dual changers, had well-designed decoupling assemblies. Lenco's is the worst I've ever seen: the engineers blew it badly because they didn't realize that the piano wire would stretch. Someone's brain was not engaged that day!

And I have no idea how one goes about restoring those original parameters. I'd rather make the arm one solid, rigid beam and be done with it. I realize that doing this will limit the range of styli that will be usable, especially the highest-compliance ones, but that's the price for stability in the original arm.

What I'd like to know is what the actual mass of the arm will be (or a humane way that we can measure this ourselves) when we're done solidifying it. This dental floss (and my harpsichord string) solution is not rigid enough. Maybe welding is in order?