northwest coils ain't coils
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australian electronic gold prospecting forum.com  |  DIY forum  |  DIY forum  |  Topic: coils ain't coils 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: coils ain't coils  (Read 2983 times)
moodz
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« on: Sunday April 13 2014 08:05:51 AEST AM »

I been makin coils ...turnin them out like hotcakes....mwhahaha.
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moodz
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« Reply #1 on: Sunday April 13 2014 08:12:27 AEST AM »

...$40
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authere
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« Reply #2 on: Sunday April 13 2014 09:10:10 AEST AM »

Hi Moodz,

Where are you at!!, I thought your detector was poohood because of a sixth law or something, is it still happening or is that project gone by the wayside(or sold to M/L).Can you tell us what's happening!!!!

Those coils look the go, low capacitance, fast but I suspect less depth, how do you find them

Ron
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moodz
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« Reply #3 on: Sunday April 13 2014 09:30:16 AEST AM »

Hi Ron ....still tracking OK .... I needed to include discrimination so there was some extra work and now I am making some coils to test different coil size vs discrim and depth.
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moodz
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« Reply #4 on: Sunday April 13 2014 09:51:04 AEST AM »

  
Hi Ron ....still tracking OK .... I needed to include discrimination so there was some extra work and now I am making some coils to test different coil size vs discrim and depth.


...oh yeah the depth is OK for an 18 inch mono ... How should I make them go deeper. I am also testing a technique to avoid using a Faraday shield. whohoo
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moodz
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« Reply #5 on: Sunday April 13 2014 09:58:26 AEST AM »

.....another one ready to be potted.
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moodz
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« Reply #6 on: Sunday April 13 2014 13:05:17 AEST PM »

Coil fitted to mold and ready to pour.
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authere
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« Reply #7 on: Sunday April 13 2014 15:00:18 AEST PM »

Hi Moodz,

Good refit of the 18" coil casing, it looks like some kind of choke fitted , you certainly work outside the square

So all that crap on Geotech about the sixth was just that, crap!!!!

I see the coil but is your you beaut detector still an ongoing thing or what!!!!

I changed from the Wally coil(8") to the 18" mono today ..still nothing, certainly could do with some new science out here, then again if all the gold is gone it aint cumin back, it sure don't grow again and restock

That's what it is....,I should have gone fishin instead, the kids just got back home from Shark Bay with a couple of freezers full of fish fillets and me mind aint on the job

Anyways what else can you tell us about your progresses,

Cheers Ron, Sherri and Yoda(reporting from north of Cue WA)out there doin it!!!
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Doug
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« Reply #8 on: Sunday April 13 2014 16:59:19 AEST PM »

Spider wound coils are the best way to go in my opinion. By far the deepest seeking large mono I ever  saw was a litz wire spider wound coil made  the late Jim Stewart.RIP JIM. Jim also believed in the importance of  potting. No one in my opinion has ever made coils as good as his! Some very lucky person probably has one of his large mono coils!
doug smile
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moodz
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« Reply #9 on: Sunday April 13 2014 17:14:47 AEST PM »

  
Hi Moodz,

Good refit of the 18" coil casing, it looks like some kind of choke fitted , you certainly work outside the square

So all that crap on Geotech about the sixth was just that, crap!!!!

I see the coil but is your you beaut detector still an ongoing thing or what!!!!

I changed from the Wally coil(8") to the 18" mono today ..still nothing, certainly could do with some new science out here, then again if all the gold is gone it aint cumin back, it sure don't grow again and restock

That's what it is....,I should have gone fishin instead, the kids just got back home from Shark Bay with a couple of freezers full of fish fillets and me mind aint on the job

Anyways what else can you tell us about your progresses,

Cheers Ron, Sherri and Yoda(reporting from north of Cue WA)out there doin it!!!



Hi Ron .. that is not a refit ... that is the mold.  When the resin sets it shrinks about %1 releases from the mold. The choke is the plastic cable strain relief. The detector is still cooking ....just need these coils for more testing of discrimination.
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moodz
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« Reply #10 on: Sunday April 13 2014 17:18:49 AEST PM »

..the potted coil sitting in the mold.
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greylourie
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« Reply #11 on: Sunday April 13 2014 18:00:32 AEST PM »

Nice clean work. Am interested in the sleeving you are using. What is it ?
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moodz
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« Reply #12 on: Sunday April 13 2014 18:17:21 AEST PM »

Thanks GL ... The sleeving is silicon airline  normally used for aquariums.  It is super flexible and strong. I extend the coil wire as twisted pair through the sleeving so there is no soldered connections near the coil. If a faraday shield is fitted then a braided sleeve will go over this tubing. The coil shield is a c piece of abs sprayed with aquadag....now who remembers aquadag...LOL.
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Doug
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« Reply #13 on: Sunday April 13 2014 21:33:20 AEST PM »

  
Thanks GL ... The sleeving is silicon airline  normally used for aquariums.  It is super flexible and strong. I extend the coil wire as twisted pair through the sleeving so there is no soldered connections near the coil. If a faraday shield is fitted then a braided sleeve will go over this tubing. The coil shield is a c piece of abs sprayed with aquadag....now who remembers aquadag...LOL.

Moodz what are you using for potting?
doug smile
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moodz
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« Reply #14 on: Sunday April 13 2014 21:43:38 AEST PM »

Casting resin from Barnes.com.au ....400ml required for the 18 inch coil.
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Aziz
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« Reply #15 on: Sunday April 13 2014 22:32:52 AEST PM »

Yep, nice coils.
happy face

I have been using casting resin too (long time ago). For heat plates & microscope stages with in-built heating resistors. The heat controller was developped by me too.

But I for one would paint the coils with either zinc oxide or
titanium dioxide paint (white paint *LOL*) to protect the resin against the aggressive UV light.

White paint should also protect from the aggressive Greedlab spies. *LOL*

Cheers,
Aziz
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Bill056
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« Reply #16 on: Monday April 14 2014 10:26:10 AEST AM »

  
Hi Moodz,

low capacitance, fast but I suspect less depth, how do you find them

Ron

One would assume this coil will have far less inductance than a minelab coil. Have you measured the inductance Moodz?
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Doug
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« Reply #17 on: Monday April 14 2014 11:58:16 AEST AM »

  
  
Hi Moodz,

low capacitance, fast but I suspect less depth, how do you find them

Ron

One would assume this coil will have far less inductance than a minelab coil. Have you measured the inductance Moodz?

If this is the case then it won't  run on a ML detector?
doug smile
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moodz
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« Reply #18 on: Monday April 14 2014 17:47:03 AEST PM »

Popped out from the mold. Woohoo.
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moodz
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« Reply #19 on: Monday April 14 2014 18:21:16 AEST PM »

Just what the doctor ordered. excited
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