northwest Tools or methords related to coil building
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australian electronic gold prospecting forum.com  |  Tools or methods related to coil building  |  Tools or methods related to coil building  |  Topic: Tools or methords related to coil building 0 Members and 1 Guest are viewing this topic. « previous next »
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Alex
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« on: Wednesday March 21 2018 20:24:38 AEDT PM »

Hi everyone. An idea I had which I haven't tried yet .just waiting for the wire .I thought it might help those who instead of grooving polystyrene .My plan is to wind a double flat spiral using 2 sheets of this contact adhesive plastic .wind one from the middle and on the other sheet in the opposite direction so it can be placed on top of the first one. Windings can be spaced and then spacer removed or adjusted if needed. Once I'm happy I could use spray foam injected through the plastic and between the wires and trowled of level with the plastic . Without the coil being enclosed at this point there shouldn't be pressure to warp or alter the windings. I hope it helps and I will let you know


* DSCF3537a.jpg (63.03 KB, 648x486 - viewed 146 times.)
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Muntari
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« Reply #1 on: Wednesday March 21 2018 23:39:26 AEDT PM »

Hi Alex,

Now that looks interesting, let us know how it works out.
Good out of the box thinking good luck

Cheers

Muntari
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Muntari
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« Reply #2 on: Thursday March 22 2018 09:47:16 AEDT AM »

Hi all,

Here are some progress photos of the modified vacuum former platen.
I have inserted some nylon spacers into the 6 mm holes and made the grooves 1.5mm deep after some advice from Ian.
Only had 1,000 to press in, still quicker than re-machining the top again.
Added some 40 mm aluminium spacers to bottom side (the Lexan tank is 40 mm high and 10 mm thick) to prevent collapse when vacuum is applied.
There will be a fine stainless steel mesh placed between mold and platen to further help even out vacuum flow.
Areas that are not covered by the mold during forming, will be sealed with the blue plastic wrap you see on the cnc table. It comes on a 300 mm wide roll and I generally use it to protect parts once machined but is perfect for the job.
I have used what materials I had laying around the workshop and modified to suit....

Did some testing on vacuum last night and it works just fine.
Tonight, I'll assemble everything, then its just the heating section to do.

Btw, those with a keen eye may have noticed the grooves are offset to the holes, they should have been centered on the holes but when I zeroed the CNC, I didn't notice the offset until it was on the second set of angle cuts and by that time, I thought, don't bother, its not going to stop it working.

More later

Cheers

Muntari


* Vacuum Former machine top_1.JPG (128.03 KB, 640x480 - viewed 137 times.)

* Vacuum former top_2.JPG (141.21 KB, 640x480 - viewed 140 times.)

* Vacuum former top_3.JPG (165.02 KB, 640x480 - viewed 141 times.)

* Vacuum former top_4.JPG (142.21 KB, 640x480 - viewed 141 times.)
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WM6
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« Reply #3 on: Thursday March 22 2018 11:18:24 AEDT AM »

  

Here are some progress photos of the modified vacuum former platen.



Great work, Muntari.

Wish to see some video, how it works, if possible.
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Alex
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« Reply #4 on: Saturday April 21 2018 20:19:55 AEST PM »

Hi all the mosaic mesh in post 51 worked out well .I added an extra layer for screen spacer and more strength.I have only 3mm between coil wire and the outer ,I may need more.One question ,The coax I was going to use can just be detected by my detector ,could this be a problem ? Thanks.
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« Reply #5 on: Sunday April 22 2018 13:32:30 AEST PM »

  

.One question ,The coax I was going to use can just be detected by my detector ,could this be a problem ? T


Not really, if it is properly fixed to lower shaft.
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australian electronic gold prospecting forum.com  |  Tools or methods related to coil building  |  Tools or methods related to coil building  |  Topic: Tools or methords related to coil building « previous next »
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