my latest iteration of "Nanook's 219 tonearm".. - Page 43 - diyAudio
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Old 1st September 2013, 04:31 PM   #421
Jay1234 is offline Jay1234  United Kingdom
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Location: Way up North, In Newcastle haven't seen the Sun for days
Prior to attaching the arm wire to anything, at this point the arm wire was just wrapped around the arm tube, the counterweight was balancing the arm perfectly.
When in this state of equilibrium, the arm would gently rotate in any direction. But it would also Ocillayte from side to side or about the axis of the bearing, at the slightest provocation, Which when you think about it is a very good thing indeed as it shows very clearly how well the bearing is working.
What I didn't do was observe how the counterweight reacted, I think it allowed the arm tube to move freely but within a confined space.
When the arm was put onto a record the ocillaytion stopped almost immediately.
However, when the wire was introduced or rather connected It began to make its presence felt. So dressing of the arm wire is rather important with a Unipivot. a bit like the dressing of the arm wire inside the Linn.

Back to the counterweight.
In my case its NOT fixed in any way, Ill try to explain; It is suspended from the arm tube by fairly thick copper wire that is loose around the tube. So it will move about ( slightly & not good in itself ) at its point of contact, which is at the top of the tube. Perhaps this could be seen as a single point of contact, the same as an upside down Uni pivot !
But if this could be controlled so the weight would not slide about.
ie a dimple on the top of the tube....
Im thinking this idea might have legs....

Would this a good way to consider mounting the counterweight ?
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Old 1st September 2013, 08:41 PM   #422
Nanook is offline Nanook  Canada
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Default a good way....

Jay,

I've used similar set ups for the counter-weight. I even made a little "rack". I adjusted a screw so that a copper wire which was situated in the threads of the screw moved forwards or backwards in a very controlled way. I have also used something exactly as you described, except I just used some tape to allow the copper wire something to grip.
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File Type: jpg underhung weight 219 arm.jpg (92.3 KB, 323 views)
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Old 15th September 2013, 03:01 PM   #423
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Default My iteration of Nanook's Arm

Hi Everyone
As promised a while ago, here is my version. Incorporated is the lift/lower device and the simple method of easily lifting and lowering the whole arm to get vta spot on without using shims etc. Sounds amazing!!
Chris
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File Type: jpg Stealth Mk3 003.JPG (954.8 KB, 283 views)
File Type: jpg Stealth Mk3 001.JPG (913.6 KB, 271 views)
File Type: jpg Stealth Mk3 006.jpg (607.1 KB, 261 views)
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Old 16th September 2013, 12:36 AM   #424
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Is that a Pickering?
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Old 16th September 2013, 09:00 AM   #425
hajj is offline hajj  Lebanon
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Quote:
Originally Posted by phivates View Post
Is that a Pickering?
Looks like an XV-15 without the brush tip
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Old 16th September 2013, 10:00 AM   #426
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Hi
No -it's a Pickering XLZ/7500S-a very good cartridge indeed!
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Old 17th September 2013, 09:54 PM   #427
Nanook is offline Nanook  Canada
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Default nicely done

Chris,

Looks very nicely done. Perhaps a little heavy...(but I prefer Grado cartridges, and the total mass of my arm works wonderfully with these). I have a similar aluminum headshell here as well. I think I'll try my hand at a Schroeder style one (such as your's using wood, cause I like wood .

The VTA adjustment is almost a moot point, how much adjustment is required? Perhaps 1" maximum. However having the ability to set the height of the tonearm makes it transferable to any turntable, more or less.

IT looks to be very well executed.
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Last edited by Nanook; 17th September 2013 at 10:00 PM. Reason: added comments
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Old 18th September 2013, 07:00 AM   #428
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Hi Stew
Thanks for the comments. I have been refining this for a number of years-although this uses carbon fibre, I have obtained an arrow shaft-due for experimentation over the next couple of weeks-I'll let you know how that works out-initial thoughts are that it is very light but not as rigid as I thought it would be-but then-nothing ventured.....
Sound quality? Very detailed and natural with excellent, well-defined bass. Agree with you on vertical adjustment-it was so easy to use the method I have come up with-same thing that Simon in New Zealand has used with the Wand.
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Old 18th September 2013, 06:20 PM   #429
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Default New Svelte Arm

New Arms! 005.JPG

New Arms! 006.JPG

Hi Stew
New arm under construction-this time using an arrow shaft- weighs in at 26g without the counterweight- pretty slim eh?

Will have it wired and working at the weekend so will give a progress report then.
Chris
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Old 18th September 2013, 07:55 PM   #430
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to be svelte it needs hips
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