Resistance per inch for 22 gauge A1 kanthal
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What kind of reading are you getting when you measure an inch and test its resistance? Does it jump around? Are you finding the resistances differing in multiple identical sample pieces?
Where did you buy the wire you are having problems with?
Cheers
I
Where did you buy the wire you are having problems with?
Cheers
I
I'm looking for vendor-defined data.
Well my build was measured at a stable value but will diminish when the outermost layer oxidizes. I bought my 22 gauge A1 kanthal at fasttech, they didn't mention the resistance value for that product so I did some reading at some sites, some said 0.109 Ohms/inch, some said 0.07 Ohms/inch etc etc. Or was there no actual fixed resistance and kanthal is just a general name for a group of alloys with similar compositions?
0.0565Ω per inch... or rather 0.999"
Is kanthal an alloy of fixed composition or was it a general name for similar alloys? There are many resistance values claimed by different sites, but not all of those are A1 tho.
Genuine Sandvik licensed Kanthal A-1 is a fixed composition of iron/chromium/aluminum. I don't know if FastTech Kanthal is identical to the licensed product, or if it's just some resistance wire they toss the name Kanthal at.
The best source for Kanthal data is the US licensed vendor, Temco. They list 22 gauge A-1 as 1.31Ω per foot (0.01091Ω per inch) at 68 degrees.
I got my first reference using the Steam Engine modeling calculator, but failed to notice I'd left it set to "dual parallel" rather than single coil (wife was calling me to breakfast... so I got rushed).
After resetting to a single coil, and tweaking the numbers to a bit finer resolution, SE calculates the resistance to be 0.11315Ω per exact inch... a 0.02224Ω difference to Temco.
I suspect the difference with SE is in diameters. When I measure genuine Temco Kanthal, it frequently tends to be a slightly smaller diameter than the values Lars (and Temco) indicates for the Kanthal range.
I don't have any 22 gauge on hand to measure... but my 24 gauge measures .0195", and SE (and Temco) lists 24 as .0201".
That's my story, and I'm stickin' to it.
The best source for Kanthal data is the US licensed vendor, Temco. They list 22 gauge A-1 as 1.31Ω per foot (0.01091Ω per inch) at 68 degrees.
I got my first reference using the Steam Engine modeling calculator, but failed to notice I'd left it set to "dual parallel" rather than single coil (wife was calling me to breakfast... so I got rushed).
After resetting to a single coil, and tweaking the numbers to a bit finer resolution, SE calculates the resistance to be 0.11315Ω per exact inch... a 0.02224Ω difference to Temco.
I suspect the difference with SE is in diameters. When I measure genuine Temco Kanthal, it frequently tends to be a slightly smaller diameter than the values Lars (and Temco) indicates for the Kanthal range.
I don't have any 22 gauge on hand to measure... but my 24 gauge measures .0195", and SE (and Temco) lists 24 as .0201".
That's my story, and I'm stickin' to it.
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If you wrap 6 wraps around 2mm (5/64, my favorite for everthing) you will be at about .28 ohm. I usually do dual coil though, which makes for about .14
My current build with 22 gauge, 2mm 9 wraps. They call it infinity coil but to me it's pseudo-infinity
Almost the same taste as dual centered 28 gauge, 1.75 8 wraps, only better
(It's single coil btw)
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