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#1 (permalink)      8/8/2017 2:56:23 PM US Central   quote/reply + tips
HamuBhau
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Bore?
I'm trying to find pre-wound clapton coils for my Protank 4 PRO RBA which I believe currently uses Kanthal clapton coil. I really like 316L SS coils though.

The problem is a lot of coils on FastTech don't say what the Bore diameter is on them and I'm pretty sure I would need 2 to 2.5 mm max. Could anyone let me know what the diameter of these are? or at least direct me to another posting?

Thanks so much!
#2 (permalink)      8/8/2017 4:22:34 PM US Central   quote/reply + tips
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MotoBlue
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+1 details
Ft usually express the outside diameter as the depth.
The inside diameter is the outside diameter minus twice the wire thickness
inside diameter = 5mm depth - 2 x (0.3 + 0.2 +0.2) = 3.6

So the inside diameter is probably 3.5mm
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#3 (permalink)      8/8/2017 5:08:27 PM US Central   quote/reply + tips
HamuBhau
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MotoBlue wrote:

Ft usually express the outside diameter as the depth.
The inside diameter is the outside diameter minus twice the wire thickness inside diameter = 5mm depth - 2 x (0.3 + 0.2 +0.2) = 3.6
So the inside diameter is probably 3.5mm



Wow ok trying to wrap my head around this, where did you get the 5 mm depth from?

#4 (permalink)      8/8/2017 5:15:49 PM US Central   quote/reply + tips
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MotoBlue
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Dimensions us | metric
DEPTH 5 mm
HEIGHT 17 mm
WIDTH 7 mm
PRODUCT WEIGHT 0.4 g

FT's dimensions are notoriously inaccurate
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#5 (permalink)      8/8/2017 7:16:21 PM US Central   quote/reply + tips
HamuBhau
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Thanks for the help, i'll try and do some calculations for other coils.. however could you possibly find something similar to what I was looking for in 316L? in 2.5 bore? That would be amazing....
#6 (permalink)      8/8/2017 7:49:42 PM US Central   quote/reply + tips
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okaywhatever
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you could just rewrap these around a 2.5...
#7 (permalink)      8/8/2017 7:55:19 PM US Central   quote/reply + tips
HamuBhau
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okaywhatever wrote:

you could just rewrap these around a 2.5...



Lol yes that's true, unfortunately I still don't have the proper wrapping tools, hence why I wanted to buy ready made ones. I'll be getting the tools soon enough but still..

#8 (permalink)      8/9/2017 5:20:42 PM US Central   quote/reply + tips
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okaywhatever
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you can get a pack of hobby screwdrivers for $1.50 from almost any dollar store. you can have them in your hand a month before these even show up.

Edited on 8/9/2017 at 5:23 PM. Reason:
#9 (permalink)      8/9/2017 5:45:56 PM US Central   quote/reply + tips
HamuBhau
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okaywhatever wrote:

you can get a pack of hobby screwdrivers for $1.50 from almost any dollar store. you can have them in your hand a month before these even show up.



Awesome thanks for the tip, will go and get them.

#10 (permalink)      9/1/2017 12:52:42 PM US Central   quote/reply + tips
pktech
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MotoBlue wrote:

Ft usually express the outside diameter as the depth.
The inside diameter is the outside diameter minus twice the wire thickness
inside diameter = 5mm depth - 2 x (0.3 + 0.2 +0.2) = 3.6

So the inside diameter is probably 3.5mm



I'm confused by this equation. On the container it says 0.3*0.8+32GA. Why isn't 0.8mm in the equation and why are there two 0.2mm?

I've not bought these particular coils, but I've bought this brand before. They're generally 3.5mm-4mm, so I'm sure the equation is right, I'm just not sure why. If I'm going to be using this equation in the future, I need to know which values to put where, etc.

Why isn't the 0.8mm considered part of the wire's thickness? Why is the 32GA doubled in the equation, if that is in fact where the 0.2mm is coming from?

I appreciate any help anyone can offer in explaining this to me. Since not all pre-made coils have the Inner Diameter mentioned somewhere in the Discussion Area/Forums, I need to learn to figure it out on my own.

#11 (permalink)      9/1/2017 3:01:59 PM US Central   quote/reply + tips
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MotoBlue
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go back and look at a picture of the coils. The 0.8mm has an effect on how long the final coil will be.

Take the flat wire of thickness 0.3mm and wrap it with 0.2mm wire. How thick is the wire now? (.3 + 0.2 +0.2)
The wire is now 0.8 + 0.2 +0.2 mm wide. The width only affects the length of the final coil.

Take a piece of string and wrap it round a finger. now compare it with the same piece of string wrapped round 2 fingers.
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