northwest The need for big deep gold detectors.
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australian electronic gold prospecting forum.com  |  Detector Technology and Electronics and new detectors  |  Detector Coils  |  Topic: The need for big deep gold detectors. 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: The need for big deep gold detectors.  (Read 24839 times)
Muntari
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« Reply #800 on: Wednesday November 7 2018 20:04:36 AEDT PM »

Here is a picture of the bundle versus flat spiral wound coils.

Same inductance on both units.
The depth and noise figures are about the same will post SRF when I get more time.
One interesting thing though is the weight, there is only about 100 grams difference... 590 bundle, 695 spiral



cheers

Muntari


* Concentric flat v bundle size.JPG (105.92 KB, 640x480 - viewed 227 times.)
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WM6
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« Reply #801 on: Thursday November 8 2018 00:35:13 AEDT AM »

  
Here is a picture of the bundle versus flat spiral wound coils.



Hi Muntari

Wrong Photo?

I cannot see flat spiral wound coil on this photo.
Seems both coils are bundle wound.
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Muntari
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« Reply #802 on: Thursday November 8 2018 09:30:16 AEDT AM »

Hi WM6,

The bottom foam pieces hold the spiral coils, I will remove the foam tonight and post a photo.
I should have explained a bit more but was just trying to show size comparison.

Cheers

Muntari
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IBGold
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« Reply #803 on: Thursday November 8 2018 16:44:39 AEDT PM »

Hi when we talk coil sizes can we use center-line measurements IE bundle center line and flat wind center-line rather than coil OD.

Regards, Ian. happy face
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Regards, Ian.
Muntari
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« Reply #804 on: Thursday November 8 2018 21:12:17 AEDT PM »

  
Hi when we talk coil sizes can we use center-line measurements IE bundle center line and flat wind center-line rather than coil OD.

Regards, Ian. happy face

Hi Ian,

Yes, sure, why not, save any confusion.. happy face

cheers

Muntari
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Muntari
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« Reply #805 on: Thursday November 8 2018 23:50:01 AEDT PM »

Here is the stripped down spiral and bundle details as promised.
I will give more info once I have completed some more builds and settled on final form, then field tested again.




More later

Cheers

Muntari


* Concentric flat v bundle size_2.JPG (69.99 KB, 640x480 - viewed 167 times.)
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Muntari
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« Reply #806 on: Friday November 9 2018 00:06:13 AEDT AM »

Just a quick note on comparing concentric spiral versus bundle wound.
Enough separation is required between TX inner and RX outer
How much, depends on the size of the RX coil required.

To get the equivalent inductance on spirals requires more turns than a bundle wound
To get equivalent  depth requires a larger diameter receive coil.
To get a bigger receive coil, requires a larger TX coil...

Then you have to balance this with the increased capacitance

No free lunch

Cheers

Muntari
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WM6
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« Reply #807 on: Friday November 9 2018 01:22:55 AEDT AM »

Great! Thank you Muntari.
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Muntari
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« Reply #808 on: Friday November 9 2018 09:49:46 AEDT AM »

  
Great! Thank you Muntari.

No Worries WM6

Btw center line for spiral wound is

TX 407
RX 228

You will notice on the flat former, windings can start an finish further in or out, depending on requirements ...it is my re-usable test bed  for the bench, field test units get fully enclosed and the former is cut to finished size to eliminate as much weight as possible so finish part looks nothing like this.

Cheers

Muntari
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Muntari
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« Reply #809 on: Wednesday January 9 2019 13:40:05 AEDT PM »

Finally, got back to setting up more coils for field testing later in the season.

Below are some photos of the 400 mm round concentric with draft 3D printed housing.

Last photo is of some Toro sprinkler stands, which are made from ABS and 350 mm diameter ..look interesting for use as a DIY coil housing...part number is embossed on them but haven't yet tried to see if they can be purchased separately


* 3d_CC_1.jpg (70.02 KB, 640x480 - viewed 84 times.)

* 3D_CC_2.jpg (96.66 KB, 640x480 - viewed 92 times.)

* Shield test.jpg (111.66 KB, 640x480 - viewed 91 times.)

* Toro_1.jpg (113.83 KB, 640x480 - viewed 86 times.)
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dasenator777
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« Reply #810 on: Wednesday January 9 2019 14:32:23 AEDT PM »

are you selling any of these coils buddy  happy face
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Muntari
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« Reply #811 on: Wednesday January 9 2019 14:42:53 AEDT PM »

  
are you selling any of these coils buddy  happy face

Might do once tested and verified  ... I have a few other things on my radar that may take more of my time, not sure yet, if trigger is not pulled on those, then I'll seriously think about it.
 
Noticed you are in the Gilbert Valley, not a long way from me  happy face

cheers

Muntari


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Alex
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« Reply #812 on: Wednesday January 9 2019 14:56:19 AEDT PM »

Great work Muntari. Thanks for sharing ,ill look forward for the test results.I am also impressed with the weight A flat spiral mono 15 inch I wound was 850gms
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dasenator777
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« Reply #813 on: Wednesday January 9 2019 14:56:41 AEDT PM »

yep im in the clare area mate , will look forward to the updates  good luck happy face
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IBGold
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« Reply #814 on: Wednesday January 9 2019 15:42:38 AEDT PM »

Hi Muntari, I am sure you have it covered but I do not see a gap in the shielding from the center to one edge of the housing so the shield does not act as a shorted turn.
I will PM you when I get a bit of time.

Regards, Ian. happy face
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Regards, Ian.
Muntari
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« Reply #815 on: Wednesday January 9 2019 15:49:58 AEDT PM »

  
Hi Muntari, I am sure you have it covered but I do not see a gap in the shielding from the center to one edge of the housing so the shield does not act as a shorted turn.
I will PM you when I get a bit of time.

Regards, Ian. happy face

Hi Ian,

Yep, have a gap there, its covered with masking tape which is hard to see in photo

cheers

Muntari
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Muntari
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« Reply #816 on: Wednesday January 9 2019 15:51:35 AEDT PM »

  
yep im in the clare area mate , will look forward to the updates  good luck happy face

Thanks Alex, yes keeping the weight down is a task in itself isn't it
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Muntari
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« Reply #817 on: Wednesday January 9 2019 15:59:11 AEDT PM »

  
yep im in the clare area mate , will look forward to the updates  good luck happy face

Yep, know the area very well, lived not far from Riverton for 10 years, worked in Clare.
Will PM when I'm satisfied with coils and let you try them out maybe . thumbs up!

cheers

muntari
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dasenator777
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« Reply #818 on: Wednesday January 9 2019 16:10:21 AEDT PM »

im 5 mins from riverton out towards marabell  happy face happy face
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« Reply #819 on: Thursday January 10 2019 12:15:21 AEDT PM »

Hi Muntari looks like good work.
I have been looking for a graphic  I think you published.
In reply 351 here you published a graphic for wm6 its a spiral but the outside winding spacings are compressed.
Did you publish a spiral graphic like that one but the turn spacing was equal ?
I've been up and down this thread but cannot find it, would it be possible to post it again please ?
Thanks
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australian electronic gold prospecting forum.com  |  Detector Technology and Electronics and new detectors  |  Detector Coils  |  Topic: The need for big deep gold detectors. « previous next »
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