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Thread: Anyone have a Spin Doctor gauss meter they are willing to sell?

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    Anyone have a Spin Doctor gauss meter they are willing to sell?

    I am looking for a good used working condition Spin Doctor gauss meter if anyone has one that they are willing to sell. Just message me a price you want for it with shipping in the U.S.

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    If you cant find one heres what we've been using for the last 25 years https://www.alphalabinc.com/product/gm1-st/

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    Quote Originally Posted by Lollar Jason View Post
    If you cant find one heres what we've been using for the last 25 years https://www.alphalabinc.com/product/gm1-st/
    and I've got one of these for sale........

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    I work on a similar project. Should be ready soon (at the moment the OLED display is missing). The software is already written (but not tested). But sending it from Europe to the US may be quite expensive.

    Mark

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    Initial test of the meter (Musicman bass):
    Click image for larger version. 

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    Test with neodymium magnet:
    Click image for larger version. 

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    It looks like milling the enclosure (in low quantities) is very difficult - no one wants to do it . I still need to design the front sticker for the meter.

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    Quote Originally Posted by MarkusBass View Post
    Initial test of the meter (Musicman bass):
    Click image for larger version. 

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    Test with neodymium magnet:
    Click image for larger version. 

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    It looks like milling the enclosure (in low quantities) is very difficult - no one wants to do it . I still need to design the front sticker for the meter.
    Please note that the readings of the flux density at the poles are changed (increased) by the presence of the strings.

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    - Own Opinions Only -

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    Yes, it was just a test whether it works . And it works.

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    Supporting Member John_H's Avatar
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    It looks like milling the enclosure (in low quantities) is very difficult - no one wants to do it
    Have you considered 3D printing, or vacuum forming? Either of these you could do yourself.

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    No, but I'm considering buying a mini CNC machine. I may use it in other projects.

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    Old Timer J M Fahey's Avatar
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    Just curious:

    Whatīs wrong with the beige plastic case you are already using?

    Is Eagle Audio your own brand or that of a commercial field sensor head?

    Thanks.

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    Juan Manuel Fahey

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    Quote Originally Posted by J M Fahey View Post
    Just curious:
    Whatīs wrong with the beige plastic case you are already using?
    Is Eagle Audio your own brand or that of a commercial field sensor head?
    Originally there are no holes in the enclosure. The most difficult to make is the hole for the OLED display. I marked it with a sharp knife and filed it. Should be done with a CNC machine.
    EA it's my own brand.
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    Depending on what your production quantities are, you could make a template that attaches to the screw holes in the case and use a router with a guide bushing to make the cutout. A 3mm or so bit would give a nice small radius in the corners.

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    The owner's Manual for the gaussmeter at the link listed in posts #2 and #3 includes some very interesting information about magnets and the earth's magnetic field.

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    Quote Originally Posted by Bloomfield View Post
    Depending on what your production quantities are, you could make a template that attaches to the screw holes in the case and use a router with a guide bushing to make the cutout. A 3mm or so bit would give a nice small radius in the corners.
    I was also thinking about such a template but to make it I need a CNC machine too. Or I have to pay someone to do it. I would use 2 mm bit to get 1 mm radius in the corners. I don't expect high production quantities. Just few friends asked me to manufacture something like this .

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    A nice thing about router bushings (especially if they are large) is that they will tend to even out small flaws in the template. If you filed out the template as well as you filed out the prototype, I think you could get a very nice end result. Some of my homemade pickup cutout templates look fairly crude, but do a good job in the end.

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    Agree, I have done the same many times.
    Spending 1 hour rough cutting, filing and, worst of all, not getting a perfect result is a downer if it has to be made for each and every case, but spending, say, 2 hours for a perfect template is worth it, since afterwards each case will take minutes and be well finished.

    The router flute cuts along the edge, and any small error or roughness is way more tolerable than the "across the grain" irregular hand sanding, so that alone makes it worth routing.

    And you donīt *really* need a template to cut a rectangular window with sides parallel to case faces!!!!

    Mount the router under a table where only bit is visible, say 10mm above the surface, then do a little measuring and Math and bolt/nail/clamp 4 straight pieces of wood to serve as a "fence" around the case, so it can only move along those edges in a straight line, and so a rectangular window is the only geometrical shape which can be cut.

    Hope this is clear enough, if *neccesary* I can draw it but hope we can avoid it

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    Juan Manuel Fahey

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    I'd think a small laser would do a fine job of the holes and display cutout. The problem with milling these is that the odd shape needs to be fixtured to the milling table and that's going to be a challenge. A laser doesn't push your part around, you just need to place it accurately so very minimal fixturing is needed. I'd call around to laser places locally and see what they'd charge you, I doubt it would be more than a euro or two per shell if you did them in batches.

    Routing might work but most plastics melt at such low temperatures you could easily end up with just a big ugly blob of molten plastic stuck to the bit and a deformed mess of your enclosure. If you try this get a single flute bit designed for plastic and attach a strong vacuum cleaner under the table to pull the chips away and cool the part as quickly as possible. Spraying the part with isopropyl alcohol can also lubricate the cut and help keep things cooler via evaporation. Exhaust the vacuum outdoors so you don't inadvertently create a flame thrower in your shop. Be sure to run the router at the slowest speed until you know what will happen. Move the part as quickly as possible past the cutter to minimize heat build up. As soon as the plastic melts and sticks to the cutter things will go downhill very rapidly.

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    Last edited by David King; 12-03-2018 at 07:51 PM.

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    Good idea with laser. Let me check it. Thanks.

    Mark

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    Quote Originally Posted by MarkusBass View Post
    I was also thinking about such a template but to make it I need a CNC machine too. Or I have to pay someone to do it. I would use 2 mm bit to get 1 mm radius in the corners. I don't expect high production quantities. Just few friends asked me to manufacture something like this .
    Hi Mark
    You could try selling them as a kit. My elepro meter was delivered as parts. I'd probably have one of yours as a spare is always useful and i'm in Europe as well.
    Cheers

    Andrew

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