Author Topic: "Rollerblocks" DIY  (Read 4380 times)

Online vinyljan

"Rollerblocks" DIY
« on: April 13, 2014, 04:53:12 PM »
I wanted to try Rollerblocks of some sort as feet for a DIY turntable, but I'll have to outsource or buy. But then I got an idea while browsing in a toy store (another story altogether).


Pic is of the base of the tt, therefor upside down. Drilled 4 holes and cemented the magnets in place. Metal ball attaches and repositions itself in the middle. When the turntable is touched it moves quite freely, only to return to the original position after a few bounces. Might actually be a bit irritating when not used to, but as it is positioned on top of an old cabinet I going to give it a try
In a maximum bank turn in a normal category airplane, like a typical Cessna, everything is fine until you turn across your own wake

Offline DeonC

Re: "Rollerblocks" DIY
« Reply #1 on: April 13, 2014, 05:30:45 PM »
OK. color me impressed! That was very smart thinking. :2thumbs: I might just have to steal that idea... :point:
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Offline Hi-Phibian

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"Rollerblocks" DIY
« Reply #2 on: April 13, 2014, 06:49:40 PM »
Interesting. Trying to evaluate the magnetism thing vs cup and freedom of movement (very important) in my head.



If a serious bump were to break the magnetic bond is there anything stopping the TT hitting terra firma?
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Fair, not crazy, cash paid for turntables and tonearms from Rega, Linn and Thorens.          http://www.croak.co.za

Online vinyljan

Re: "Rollerblocks" DIY
« Reply #3 on: April 13, 2014, 07:26:14 PM »
I think the power cord and arm wires will have quite an effect on freedom of movement once connected. Metal spheres are 12mm diameter and the magnetic bond is amazingly strong to disconnect, but allows the ball to roll quite freely, but the further away it moves from the magnet's centre, the more the magnetic effect to centre it again.   
In a maximum bank turn in a normal category airplane, like a typical Cessna, everything is fine until you turn across your own wake

Offline Hi-Phibian

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Re: "Rollerblocks" DIY
« Reply #4 on: April 13, 2014, 07:32:16 PM »
Which is exactly like a cup. The ratio of curve and ball radius is of great importance according to the roller block developer.  Thus the magnetic strength would be too.
Of course roller blocks do not isolate, they only provide an energy drain for what gets in the device and is made by the device.
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Fair, not crazy, cash paid for turntables and tonearms from Rega, Linn and Thorens.          http://www.croak.co.za

Offline Hi-Phibian

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Re: "Rollerblocks" DIY
« Reply #5 on: April 13, 2014, 07:35:22 PM »
I quite like it. What toy is it based on?

Some simple rimmed metal cups like bottle tops or similar would enhance safety. Only minimal movement is needed as long as it is free.
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Fair, not crazy, cash paid for turntables and tonearms from Rega, Linn and Thorens.          http://www.croak.co.za

Offline Kemosabe

Re: "Rollerblocks" DIY
« Reply #6 on: April 13, 2014, 10:21:10 PM »
When it comes to buying or fabricating a roller block type solution what options are there?
DIY hi-fi: the journey is the destination.

Offline Hi-Phibian

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Re: "Rollerblocks" DIY
« Reply #7 on: April 13, 2014, 11:41:29 PM »
Roller blocks by symposium and cold ray by, cold ray...
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Offline Kemosabe

Re: "Rollerblocks" DIY
« Reply #8 on: April 14, 2014, 03:05:04 PM »
Roller blocks by symposium and cold ray by, cold ray...
And what would those of us without $350 to spend on a few steel balls do?
The steel balls are obviously quite easy to get.
What about the little hollow that holds them - a bit less easy.
DIY hi-fi: the journey is the destination.

Offline GearSlave

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Re: "Rollerblocks" DIY
« Reply #9 on: April 14, 2014, 04:16:36 PM »
If a serious bump were to break the magnetic bond is there anything stopping the TT hitting terra firma?

I think the power cord and arm wires will ...   

 :ROFLMAO: :ROFLMAO: :ROFLMAO:
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Offline DeonC

Re: "Rollerblocks" DIY
« Reply #10 on: April 14, 2014, 05:07:03 PM »
These guys, Magnets 4 u have some really nice rare earth magnets in their catalog. They have some shallow pot rare earth magnets (19mm, 28.5mm and 38mm dia.), deep pot rare earth magnets as well as rare earth magnet discs. They just don't have prices on the site, but these seem like they would be just what the doctor ordered. :thumbs: Those rare earth magnet pots have their N-pole in the middle and the S-pole on the edges. I think that should be ideal, but then again, I was never any great shakes at physics. What you you guys think?

Deon
Life is not measured by the breaths you take, but by the moments that take your breath away.

Offline DeonC

Re: "Rollerblocks" DIY
« Reply #11 on: April 14, 2014, 05:38:19 PM »
Here are some very nice magnets from Magnetech:
Neo Disc 22x20mm N38 Ni
Code: M-ND-D-N38NI07
Quantity in Stock: 55
R 86 each
Life is not measured by the breaths you take, but by the moments that take your breath away.

Online vinyljan

Re: "Rollerblocks" DIY
« Reply #12 on: April 14, 2014, 07:42:23 PM »
:ROFLMAO: :ROFLMAO: :ROFLMAO:
:facepalm: " I was misquoted"  :BWAHAHAH:.,when I first tried it, it was with the turntable base without any wires, and it moved quite a lot. It will be less with the arms etc included, same with rollerblocks.
The magnets are neodymium, 10mm diameter and cost R12 each, metal balls diameter 12 mm diameter,  R4 each. Not part of any toy, it's one of those science projects shops. To pull these apart is not easy, 2 magnets stuck together can only be separated by sliding apart. Honestly don't think it will come apart by/due to an accident.
Milling or finding something to use as a hollow cup that is perfectly smooth and hard enough for a heavy plinth  :thinking:, difficult
In a maximum bank turn in a normal category airplane, like a typical Cessna, everything is fine until you turn across your own wake

Offline Hi-Phibian

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Re: "Rollerblocks" DIY
« Reply #13 on: April 14, 2014, 07:49:09 PM »
Going through the trouble of a proper cup would defeat the simplicity of the magnets and make them redundant.


Perhaps just an o ring larger than the ball, placed on the support surface surrounding the ball will stop a free roll.
Proprietor of Croak Audio Exploration.
Fair, not crazy, cash paid for turntables and tonearms from Rega, Linn and Thorens.          http://www.croak.co.za

Offline Kemosabe

Re: "Rollerblocks" DIY
« Reply #14 on: April 14, 2014, 08:48:26 PM »
Strong magnets anywhere near your cartridge may not be good. I know someone who can detect 4 fridge magnets brought to withhin 1m of the tt.
DIY hi-fi: the journey is the destination.