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Old 3rd April 2009, 06:01 PM   #21
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Hi Tom,
It's great you're showing up here in underground world of homebrewed TT builders.
For DIYers the sheer platter mass is the easiest and sometimes the only practical way to reach a decent speed stability. But here is the catch: unevitatble inaccuracies of "kitchen table manufacturing" may nullify the whole gain. Two things mostly matter here: bearing tolerances and platter balancing. Widely used conventional journal bearing has an inherent drawback: platter shaft goes into precession within the bearing gap. Thick platter with the long spindle suffers from dynamic unbalance, especially when the platted CG is set away from the bearing geometrical center. Piere Lurne discussed this topic in length.
Bearing drag fluctuations due to this phenomenon shall be much more substantional, that stylus drag variations, with all my greatest respect to Chris Brady. So, staticaly/dynamicaly balanced heavy platter with the CG at the center of tightest tolerances bearing is the ticket IMHO. How close a humble DIY builder can approach to this target? - I dunno.
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Old 3rd April 2009, 07:04 PM   #22
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Greetings,

Ah, if I only had the time, this (DIY) section of the internet would be one of my favorite places to hang.

The DIY-er has one great advantage over the manufacturer - the ability to put huge amounts of sweat equity into their projects.

In the areas of both electronics as well as turntables, obviously a solid design counts for a lot, but frequently manufacturers have to make cost compromises in order to achieve a realistic price for products other than their cost no object items.

Where the DIY-er can somewhat easily stomach a boutique transformer or adding 20 more pounds of platter mass, the manufacturer might be cost constrained from doing so. The cost effects of weight seem to be exponential, and sometimes, I wish I was in the cartridge business instead.

So, the DIY-er can make up for minor design deficiencies in this manner - bearing in mind of course that a solid design is still the basis for any success.

With respect to the bearing design, Chris Brady, myself and the other members of the original "Teres-5" took this center of gravity issue very much to heart - with respect to the idea of any precession that might ensue from wobble resulting from too high a center of gravity.

What we learned, is that while this geometry is a good thing to achieve (and we designed it into the platter/bearing), its need can be obviated by holding aerospace tolerances in your bearing clearances.

There's another place where a DIY-er may not be at a disadvantage - bonding with their machinist. If you can find out what your machinist's favorite micro-brew is, you can make quick friends (make sure they're not enjoying it when making your parts)

An interesting thing about many machinists is that they're very passionate about some esoteric pursuits, and will come in on days off to make stuff for them. Frequently, it's guns and hot rods ... at least in my experience.

What this means is that you have a chance at bonding with them indirectly by showing them that you're as out of control as they are. Sick minds think alike, and we all have to stick together

Cheers,
Thom @ Galibier
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Old 4th April 2009, 04:38 AM   #23
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Hi Clack,

I have attached the animated image of the square knot I am talking about. It is also known as reef knot. Will that fit the purpose or do you have a image of the knot you were talking about ?

Regards,
Bins.
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File Type: gif square knot.gif (19.2 KB, 717 views)
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Old 4th April 2009, 06:15 AM   #24
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Hi Clack,

I got an image on how to make a knot (Actually it is for the Scheu turntable). I think, we can also follow that one. Is that the same you follow ?

Regards,
Bins.
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File Type: png knot.png (5.9 KB, 655 views)
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Old 4th April 2009, 08:09 PM   #25
dario54 is offline dario54  Israel
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Hello,
For those, like me that cannot use tape for lack of space and must or prefer to use strings, here's the solution as published few years ago by Teres (if I remember well) before they started suggesting tape:

http://www.marinews.com/Double-Blood-Knot-251.php

Hope this helps....

Dario54
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Old 5th April 2009, 03:53 AM   #26
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Hi Clack,

This thing is getting bigger and bigger with more options. Which one will you suggest ?

Regards,
Bins.
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Old 14th May 2009, 07:09 AM   #27
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Hi,

Got a document on how to tie a belt knot (From Well Tampared Labs)

Regards,
Bins.
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File Type: gif knot.gif (8.4 KB, 520 views)
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Old 14th May 2009, 09:49 AM   #28
Clack is offline Clack  Italy
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Hi everybody
I apologize for my long absence but the system didn't alert me for new posts. Funny.
I saw the pics posted by Binspaul and now I know I am using a square knot. Don't know if double blood knot could do, seems too big to me, but if Teres says so, it should work.
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Old 15th May 2009, 05:37 AM   #29
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Hi Clack,

Nice to see you back. I am planning to go for the square knot. I will try with the following fibers and will let you know the results:

* Surgical silk (Single strand as well as braided)
* Nylon (Single strand as well as braided)

Best regards,
Bins
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Old 15th May 2009, 11:40 AM   #30
Stuey is offline Stuey  Australia
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Hi Bins,

Maybe you could try braided fishing line (if you haven't already!) as you can get different stretch characteristics.

Some of the better monofilaments have a nice soft feel, too, and are better to tie.

You may even be able to melt the ends together rather than knotting.

Cheers

Stuey
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