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Magnetic Tumbler, Polishing home brew unit

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PTsideshow:
Might come in handy for people doing non ferrous small parts on the forum.
Here is 5 pages of plans and instructions for a shop made magnetic tumbler

It should be a easy project for members here.
This is a video of a different one a lot cruder, notice what he is using for a disk to hold the magnetics.
a video of a different style home brew finisher

The following are in case anybody needs a spot to get the other parts. The evaporative cooler motor is based on the use under the water filled bowl filled with spinning stainless steel tumbler pins. The pins are magnetic to make them easier to separate from the jewelry or other non ferrous items.

a neat place for parts, she was very pleased with the help and service
A lapidary/grinding sanding polishing equipment maker dealer.

If you can't find a bowl or container here is a place that will have something.
great place to deal with I have been a customer for 25 years

The pins can be had from most jeweler supply houses
Contenti
Gesswein
Otto Frei
Metalliferous
Grobetusa
RioGrande

They can cost $1,200 and up  from supplier, or $120.00 or less depending on what you feel like making up.
 :dremel:

snub:
Thankyou for posting this, you have definately piqued my interest.  I built a homemade vibratory tumbler but found out that you need to vibrate the media for 24 hours just to get it " broke in", but the parts need to vibrate for 24 to 48 hours to get a decent finish. No way I am leaving a motor running for 2 days...unattended. Don't need to burn my shop down.

So this magnetic tumbler (according to one of the websites you linked to ), will do the same job in 30 minutes.

I read the 5 page 'how to' and watched the video. They both say that the magnets need to alternate in the circle, from north pole to south pole, or positive to negative, but neither one tells you how to determine the poles of the magnets.

Also, I snatched this from the 'how to'...Not sure  what he means. There are only 2 dimensions on a circular object, width and height. But he adds " 30 or more". Me confused.



He also neglected to add the "pins' to his parts list. The first link you gave showed 2 diameters of pins, at 1/2 pound for $29.95. What would be a good amount to start with for 'experimenting'?

No1_sonuk:

--- Quote from: snub on May 26, 2010, 01:09:04 AM ---Also, I snatched this from the 'how to'...Not sure  what he means. There are only 2 dimensions on a circular object, width and height. But he adds " 30 or more". Me confused.


--- End quote ---
That says 30 or more MGO, which (I think) is a definition of the magnets' strength.

Bernd:

--- Quote from: snub on May 26, 2010, 01:09:04 AM ---I read the 5 page 'how to' and watched the video. They both say that the magnets need to alternate in the circle, from north pole to south pole, or positive to negative, but neither one tells you how to determine the poles of the magnets.

--- End quote ---

To find the poles of a magnet you would use a compass. Usally the compass has two colors on the needle. First determine what color is used to point north. Take note of that color. Next slowly bring the compass and the magnet close to each other. See which color is attracked to what end of the magnet. If the color is the color you determined that was north it will indicate the north pole on the magnet.

NOTE: Somebody tell me if I wrote this correctly for easy understanding please.


--- Quote ---Also, I snatched this from the 'how to'...Not sure  what he means. There are only 2 dimensions on a circular object, width and height. But he adds " 30 or more". Me confused.

--- End quote ---

I think magnets are quote in "GAUSS" for strength. Again somebody correct me if I'm wrong. I did a quick search on the web using MGO and didn't get anything remotley related to magnets.

Hopes this has helped some.

Bernd

mklotz:
Magnet strength is usually rated in units of Gauss, but MGO can be used as well..
 
MGO stands for MegaGauss Oersteds and can be expressed in a "grade" number that represents the end of an equation that takes into account coercitivity, flux, retentivity, and all the magnetic-related goodies.  It is the maximum energy product of a magnet, and it doesn't really tell the true strength of the magnet.  What it does tell is the quality of the materials the magnet is made out of.  So it is a good indicator or the strength of a magnet.

Google "MGO magnet strength" for more information.

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