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Old 5th May 2010, 06:09 AM   #111
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Quote:
Its not a free lunch but it's as close to one as you are ever going to get. The more you look at it Cantus is a very clever design.

No free lunch but trying different things offer free play. I agree that the Cantus is a very clever design and I understand the theory behind it but not many people have tried or even designed a mechanical linear tonearm like that before so people are just itching to try all the variations. The Cantus has already been designed so the fun for me is to find an alternative that can work just as well with even less hassle and that's where the fun is at. For me, it's an intellectual exercise and for others it's a mean to get a quality tonearm at an affordable price. Thanks for providing the design details though.

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Old 5th May 2010, 07:10 AM   #112
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That's exactly what will make for a fantastic thread. Keep the ideas rolling.
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Old 5th May 2010, 01:54 PM   #113
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Yeah, thanks Moray for the great info. Good to know what others found in their quests.
I am surprised that the vertical pivot caused trouble. Sometimes you never know until you try!

Of course the idea of the bearings on top of the tube is not to do it better, but make it easier for DIY. It's certainly going to be a bit "tipsy".
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Old 5th May 2010, 07:42 PM   #114
Nanook is offline Nanook  Canada
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Default thanks Moray...

UR my hero

Make no mistake, creativity has its own rewards. The Cantus should be respected for what it is (and for having longevity in the marketplace), a very clever idea implemented as simply as possible. I am pretty shocked that it (and the Continuo) hasn't received more attention in the audio press. As it is Rauna's design, perhaps it has never received a lot of reviews, so as to keep sales "enough" without creating a huge demand.

Things that I have always respected in all designs are simplicity, longevity and good design to begin with. The turntable itself is unique in this way, how many upgrades has Linn had over the first 25 years of the LP12? And as far as I know the tonearm has been on the market as long...
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Old 5th May 2010, 09:16 PM   #115
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Hi,

Quote:
how many upgrades has Linn had over the first 25 years of the LP12?
Not all of which actually upgraded the sound of the deck but that's another story.

Should there be any of you actually using a Nottingham Analogue Paragon arm, I'd be interested to learn how Tom Fletcher (the man behind the company) tackled the basic problems.
A PM would be welcome, I don't want to spoil this great thread.

Ciao,
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Old 5th May 2010, 09:52 PM   #116
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Quote:
Should there be any of you actually using a Nottingham Analogue Paragon arm, I'd be interested to learn how Tom Fletcher tackled the basic problems.
Various versions of the Paragon. Judging by the last two pictures, I think it uses V-groove bearings.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

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Old 5th May 2010, 10:28 PM   #117
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Hi,

Thank you for the pics.

One of the reasons I asked, besides having tons of admiration for what Tom Fletcher achieved, is that he was convinced that a tonearm, be that a tangential one or a radial tracking one, should have at least one physical contact with it's base in order to evacuate unwanted vibrations.

I am convinced he's right as other than going for a very high pressure airborne tonearm cartridge induced vibrationswill tend to travel back and forth.
This is something we learned while developing the Goldmund parallel tracking arms and also saw confirmed in Tom's brilliant radial tracking uni-pivot arms.

Anyway, back to topic...

TA,
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Old 6th May 2010, 01:24 AM   #118
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I think that Mr. Fletcher did a fine job of the visual esthete's of the Paragon arm being very clean and understated very business like. I think that with air or magnetic arms or tables for that matter you have an unfortunate disconnect and compliance issues which are easily dealt with in a mechanical design but not so otherwise.
Bo's premise is to keep things as rigid as possible so that the motion of the tip translates into the maximum amount of electrical energy.
I wonder are there any mechanical engineers here who might offer some suggestions as to calculating the approximate COG of the arm then possible configurations could be considered to lower the assembly as close to the record surface as possible and maintain stability. The COG should be just below the pivot point.

While I play with ideas I have decided to get a Cantus and Continuo then if I decide to experiment I will have the real thing to compare to. Is there anyone here who is also interested? If so you can PM me for a discussion. Best regards.
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Old 6th May 2010, 10:07 PM   #119
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ANOTHER IDEA

Here's another thought in my head. If I use two round rods in parallel on the horizontal plane, I can use two U-groove bearings gliding laterally without any vertical movement. And then I can place a dual-pivot housing with two spikes and an armwand on top for vertical bearing. This way I can have more control or damping on the vertical plane such as using fluid or even magnet to stabilize the bearings to lessen the rocking. The two spikes can be blunted or use two small ball bearings or flatter surface to reduce vertical movement. And the two U-groove bearings need not to be linked together physically, which can reduce over all mass. Of course, you can always add a linkage between the two bearings. And the bearing wells can be filled with viscous fluid for damping vertical movement.

I hope the crude pictures gets the point across.

Click the image to open in full size.

Ugroove bearing on horizontal plane.

Click the image to open in full size.

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Last edited by directdriver; 6th May 2010 at 10:09 PM.
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Old 6th May 2010, 10:13 PM   #120
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Wow, I like that top riding Paragon. Very nice. Of course I like it because that's basically what I dreamed up. Slick design!
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