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 (Moderator: Goldman)  |  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 32196 times)
mylab
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« Reply #820 on: Thursday January 10 2019 12:53:38 AEDT PM »

It would be interesting on how a large spiral wound DD goes up a against a large spiral wound Concentric and for a fair comparison be the same overall diameter?
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Muntari
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« Reply #821 on: Thursday January 10 2019 15:15:08 AEDT PM »

"I have been looking for a graphic  I think you published."

Hi 6666, I'll find it and post no probs.

cheers

muntari
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Muntari
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« Reply #822 on: Thursday January 10 2019 15:22:51 AEDT PM »

Hi 6666,

Is this the one?

If not,let me know the number of turns and spacing, size etc and I'll draw one up for you, no probs..

cheers

muntari


* Size Spider_Coil TX RX V1.JPG (126.27 KB, 832x837 - viewed 239 times.)
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Muntari
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« Reply #823 on: Thursday January 10 2019 16:10:24 AEDT PM »

6666,

here is the other one

cheers

muntari


* Spiral_6666_1.JPG (129.77 KB, 794x771 - viewed 237 times.)
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6666
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« Reply #824 on: Thursday January 10 2019 16:15:51 AEDT PM »

  
6666,

here is the other one

cheers

muntari

Thank you this is what I was looking for , much appreciated.
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Muntari
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« Reply #825 on: Thursday January 10 2019 16:37:40 AEDT PM »

No worries,

Let me know if you need a different template and I'll CAD one up for you

cheers

muntari
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Muntari
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« Reply #826 on: Thursday January 10 2019 16:43:47 AEDT PM »

  
It would be interesting on how a large spiral wound DD goes up a against a large spiral wound Concentric and for a fair comparison be the same overall diameter?

Hi Mylab,

Yep, that's in the works too.
One version at same diameter as inner RX, another version at TX size or outer shell size.
Any other ideas let me know and I'll put that on the todo list...

cheers

Muntari
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mylab
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« Reply #827 on: Thursday January 10 2019 19:41:17 AEDT PM »

Thanks Muntari.
Look forward to the results.
No other ideas at present.
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6666
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« Reply #828 on: Friday January 11 2019 06:53:54 AEDT AM »

  
No worries,

Let me know if you need a different template and I'll CAD one up for you

cheers

muntari

For interest do you cad a spiral by hand or is there a template ?
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Muntari
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« Reply #829 on: Friday January 11 2019 16:48:33 AEDT PM »

  
  
No worries,

Let me know if you need a different template and I'll CAD one up for you

cheers

muntari

For interest do you cad a spiral by hand or is there a template ?

No template just function in the applications
I use SolidWorks or Fusion360 depending on the job I'm asked to do. Both have similar tools. They have  helicoil or spiral functions and you set the diameter, pitch and height plus the material size or diameter. Then number of turns.
Other CAD software probably has a similar function but these are the two I use regularly.
Fusion360 is an online use application with a student version or hobby version available still I think for free. You will need 64bit Windows PC but check it out, its ok.


cheers

Mdtoday
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6666
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« Reply #830 on: Friday January 11 2019 21:04:24 AEDT PM »

  
  
  
No worries,

Let me know if you need a different template and I'll CAD one up for you

cheers

muntari

For interest do you cad a spiral by hand or is there a template ?

No template just function in the applications
I use SolidWorks or Fusion360 depending on the job I'm asked to do. Both have similar tools. They have  helicoil or spiral functions and you set the diameter, pitch and height plus the material size or diameter. Then number of turns.
Other CAD software probably has a similar function but these are the two I use regularly.
Fusion360 is an online use application with a student version or hobby version available still I think for free. You will need 64bit Windows PC but check it out, its ok.


cheers

Mdtoday


Thanks I will check them out, cheers.
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geof_junk
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« Reply #831 on: Friday January 11 2019 22:11:08 AEDT PM »

Keep up the good work guys  excited
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6666
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« Reply #832 on: Tuesday November 3 2020 10:47:17 AEDT AM »

Did anybody continue with this experiment ?
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Tinkerer
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« Reply #833 on: Saturday November 14 2020 05:47:22 AEDT AM »

  
Did anybody continue with this experiment ?

Having achieved hyper sensitivity for extremely small gold nuggets, I am now looking for the next project.

What should it be?
Deep large nuggets?
Medium size nuggets?

What coil size? Unfortunately with this method, the coils are on the heavy side. 550grams for a 200mm diameter coil. The heavy part is the copper wire.
Theoretically there is no limit to the coil size. What would be practical in the australian gold fields?
What would the maximum diameter be? The maximum weight for such a large coil?
Depth is relative to the diameter.
For a large diameter coil, what should the smallest nugget be it can find?

Or, going a different way: a medium size coil for medium depth and medium size nuggets. What would the desired minimum and maximum size nuggets be?
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geof_junk
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« Reply #834 on: Saturday November 14 2020 10:04:35 AEDT AM »

Another type of coil could be a coil for patch hunting. A wide scan with good sensitivity to small nuggets ( a gram) at shallow depth and most of all "LOW" weight.
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IBGold
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IBGold at home.


« Reply #835 on: Saturday November 14 2020 15:28:33 AEDT PM »

Tony email me if you still have my email address we can discuss.

Regards, Ian. happy face
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Regards, Ian.
Tinkerer
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« Reply #836 on: Saturday November 14 2020 19:26:55 AEDT PM »

  
Another type of coil could be a coil for patch hunting. A wide scan with good sensitivity to small nuggets ( a gram) at shallow depth and most of all "LOW" weight.

Thank you for the feedback.

Could you expand a little on your remarks?

Do I understand right when you say a 1 gram nugget is small?

Low weight coil: I am afraid about 550grams for the 200mm coil with cable is the best I can do. The amount of copper is the limiting factor. It is always a tradeoff between battery weight and coil weight.

Wide scan: Our proof of concept nugget coil is a 200mm round "mono coil". An elongated coil of 200x300mm coil would give about the same depth and sensitivity. Is that what you mean?

Our present extreme sensitivity, with all the settings at maximum, 33k PPS, max sensitivity, max power, is passing the test for detect-no detect for a 0.0002gram gold nugget.
Would you consider a 320mm diameter coil that passes the 0.1 gram test as good?

Could you describe what you mean by "patch hunting". I live up in the mountains in Switzerland. Far, far from any gold fields. Any information, pictures and descriptions of actual gold detecting would be very welcome.
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Tinkerer
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« Reply #837 on: Saturday November 14 2020 19:45:30 AEDT PM »

  
Tony email me if you still have my email address we can discuss.

Regards, Ian. happy face

Hi Ian,

I have sent you a mail.

All the best
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australian electronic gold prospecting forum.com  |  Detector Technology and Electronics and new detectors  |  Detector Coils (Moderator: Goldman)  |  Topic: The need for big deep gold detectors. « previous next »
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