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cm ² I'm middelaged too, and can't focus properly on anything closer than several yards away. I've got lots of glasses, one pair for the computer, one for the cell phone etc. Very annoying. Three times stretch seems like a good choice. It doesn't have to be scientific, it only has to work. Do...

No offense taken on my part. On the contrary, you helped put me on the right path in reminding me that the units of measurment had to be the same. That mm squared thing in my earlier post was just me not thinking straight. This oven project requires lots of calculations over and over again...

rolynd's result are in square centimeters,-so let's try to convert everything into centimeters: 2 x PI x 0.05 (wire radius) x 918 (wire length) = 288 cm squared. Yessss,-same result as rolynd Let's convert it into millimeters: 6.28 x 0.5 x 9180 = 2880 mm square = 288 cm squared. Ah,-good...

True, same units across the board, inches, millimeters, lightyears,-doesn't matter, but when I do that the results get insanely wild. I used the same numbers as in rolynd's examples and I got the same results as he did by multiplying wire area by a factor of 10. His result was 288 square...

Sorry for pushing on with this topic, but if anyone wants to build a heat treat oven this info might be useful. In the tutorial there is a formula for calculating surface area of the restistance wire which is neccessary to calculate the surface load. The formula for wire surface area goes like...

rolynds tutorial is very good, but at the end he says that the reader can now calculate the length of the heating element when it is coiled. Problem is there is no formula, table or method given in the tutorial that would make this possible. rolynd hasn't been here since february so I haven't...

Great links,-thanks!

I'm not a full tang kind of person. Here in Scandinavia hidden tang has been the thing since the bronze age, but the beautiful pattern this guy makes with his dremel or whatever tool is so nice that I'm tempted to go full tang once in a while. Seems doable with a little practise.

I signed up less than hour ago, and already I've got a reply with very useful info. This forum seems to be alive and well,-thanks a lot.

A member here,-rolynd, posted a tread on how to calculate the heating elements for a heat treat oven some time ago. Very handy info, and so far so good. But,-(there's always a but), does anyone here know where to buy kathal A1 wire in useful diameters? Anything between 11 and 14 AWG (2.3 to 1.6...

You need to see this,-best I've seen for a very long time. Here it is