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Hmmm, I have not worked with loft before. I do it all and get the lofted thread, except it comes out as a 2D (flat) spiral instead of having triangular thread cut. What happened?
Oh. Maybe this technique only works if loft is greater than x, so that there is enough pitch between each 20 degree image to get the thickness you want. Mine is a precision thread with only 1mm between threads. Base of thread needs to be 1mm wide, and thread is 0.5mm tall. Maybe technique will not work. I have tried to rotate a triangle around a circle but that technique has a problem when it is time to tweak the break in the circle and raise that end triangle up 1mm.... 123D only will allow me to tweak it upward at an angle perpendicular to the top triangle edge, rather than parallel to the inner edge of the triangle (extending up in Z direction).So...stuck on how to make a triangular blessed thread.
Oh here we go. Looking like if I rotate the images in Z direction so that rather than flat they are tilted, that that should do the trick. Just a matter of doing the math to get the right thickness at base (1mm).
Yay! Just rotated the image 90 degrees to make it vertical along minor axis, and used the desired 1/2 thread rise divided by 9 rotations, per your excellent instructions. Had to place a platform under the thread object, to use its center for all my coordinate system manipulations. Added fillets at top and bottom to clean it up.