Chance PI coil...

[baum7154]

Heat forming the Lexan mounting yoke. The Lexan must be dried for 1 1/2 hours @ 200F, then 30 minutes @ 250F. Heating to 300F gets it to forming temperature. The attached pictures show the Lexan on the form and ready for attachment to the coil bridge with cement.









Dan

[baum7154]

3DSS Racetrack Coil Build

The photo below shows the coil yoke cemented to the bridge and ready for attachment to the coil body.



This next photo shows the bridge and yoke assembly superglued to the centerline of the coil body using superglue.



This final photo shows the polyester lacing reinforcement to the bridge/yoke coil attachment. This step can probably be eliminated but it only requires a few minutes of time to do. The next step is the second coat of fiberglass and resin.



Dan

[baum7154]

3DSS Racetrack Coil Build

Attached here is a picture of the coil with both layers of fiberglass and resin. The coil has been de-wiskered and has been sanded overall with 100 grit sandpaper in preparation for the resin coat. This last coat is where the visual 'magic' happens. A photo of that will be coming soon.



Dan

[aries1470]

Hi guys,
I am a total noob to these things, for constructing coils, but not electronics, except that I don't have an osci. What I would like to ask, is the following:

I have noticed that the design is a flat 2D. What happens if we try to make it in to 3D as in the image attached, and sorry from now, as I am the worst drawer, even if my life depended on it.
There can be notches and holes to assist with keeping the top vertical half and bottom vertical half, while the horizontal one will have the holes to accomodate the top and bottom halves.
This will also help when using tape to seal it before putting the coil in epoxy, fiberglass, or whatever mold.

So basically, the curiosity just got the better of me. I think just a small round head would be easier to build originally compared to the racetrack version, only due to the "stress" of bending, but I can be mistaken, as I am unaware personally of how to make these, except the round one maaaaaaaaybe.
At the moment, I am just waiting on some boards to get in to this great hobby and enjoy myself, while learning at the same time.

If anyone has any ideas, I am more than welcome to hear them.

[aries1470]

In addition to the previous post, here is a little more detail.
Instead of using open ended outer slots, what about cut outs? or even holes?

Here is an example, and yes, I know this will need a labour of love to be made.

What do you guys think? First is it feasable, and second, would it make any difference, small, worse better...
Or, if anyone has a 3D printer, a small head could theortically be printed like a 4in just for proof of concept.

[baum7154]

In addition to the previous post, here is a little more detail.
Instead of using open ended outer slots, what about cut outs? or even holes?

Here is an example, and yes, I know this will need a labour of love to be made.

What do you guys think? First is it feasable, and second, would it make any difference, small, worse better...
Or, if anyone has a 3D printer, a small head could theortically be printed like a 4in just for proof of concept.[ATTACH]33556[/ATTACH]

-------____

Hello Aries,

I suggest you read this entire thread as many of your suggestions have been covered in it already. Not saying that there isn't more room for development as there always will be.

Best of luck!

Dan

[baum7154]

3DSS Racetrack Coil Build

Attached below are a few pictures of the coil with the final resin coat applied. This coat turns the sanded finish of the previous picture posted into a crystal clear one that allows the pinpointed markings on the round ends and the 328uh value of this coil to be easily seen. It is even clear enough to see the bridge lacing beneath the 2nd glass layer.







Now it's time to get it mounted on the detector set damping and test it in the field.

Dan

[baum7154]

3DSS (3D winding pattern, Self Shielding) Racetrack Coil Build

Attached are a few photos of the new 3:1 Racetrack Coil installed on my Chance PI detector.








Next at thing is to set critical damping and field test this coil.

Dan

[baum7154]

3DSS (3D wind pattern - Self Shielding) Racetrack Coil Build

Since this build has been going on for quite a while my posts on its construction are spread across several pages in this thread. Below are the post numbers in this thread that pertain to this build.

POST NUMBERS: 126, 134, 136, 138, 139, 142, 169, 173, 177, 179, 215, 216, 228, 229, 232, 236, 254, 255, 256, 257, 258, 262, 263.

Hopefully this will help to find construction details quickly.

Dan

[baum7154]

To clarify on the construction of these coils I am using 24 AWG, 19 strand 36 gauge, silver plated, 600 volt PTFE (TEFLON) insulated wire. This wire has the lowest resistance in 24 gauge and great flexibility for use in the continuation of the coil wire as a twisted pair feed line with very low capacitance.

Regards,

Dan

[Old cart]

Nice coil Dan. How much does it weigh?

[baum7154]

Hi Old Cart,

Thanks for the kind word on the coil. It has been in design and development for about 2 years at least in my head. To answer your question the coil and integrated feed line weighs
11oz. It could be made a bit lighter if just one layer of fiberglass was used to armor it but I used two layers of resin and mat along with a gloss clear coat for max protection/waterproofing.

Regards,

Dan

[baum7154]

3DSS MONOCOIL WEIGHT

I do have one more datapoint on the weight of my 8" round 334uh 3DSS coil. Construction details and photos of this coil are posted in this thread beginning with post #30. With feed line the coil weighs 10 ounces or about 285 grams. It is about one ounce lighter than the 328uh 3DSS 'Racetrack Coil' mentioned in the previous post.

Dan

[baum7154]

3DSS Coil Weight

3DSS coil weight is about 11.5 grams per inch (2.5 cm) of circumference. This is dependent on the number of fiberglass layers (2 in my construction) and will be lighter if only a single layer is applied.

Dan

[Old cart]

Thanks Dan, that is pretty light