KrokoHunter
Sr Member
Thanks Frank
Just a quick note to everybody, so you don't make the same mistake as I did.
Franks method is spotless, as long as you cut the rings from a flat piece of styrene, because of the warping of the part, when fitted to the hemisphere surface.
However, if you cut the rings from a vacformed styrene-pull, like me, then the method and meaurements are no good, since, the parts will have no additional warping, which means that an inner diameter of 23mm and an outer diameter of 46mm is of course to small.
I'm cutting new (and hopefully correct ) rings at the moment. Once I have those cut, and verified the measurements, I'll post pics and measurements.
Just a quick note to everybody, so you don't make the same mistake as I did.
Franks method is spotless, as long as you cut the rings from a flat piece of styrene, because of the warping of the part, when fitted to the hemisphere surface.
However, if you cut the rings from a vacformed styrene-pull, like me, then the method and meaurements are no good, since, the parts will have no additional warping, which means that an inner diameter of 23mm and an outer diameter of 46mm is of course to small.
I'm cutting new (and hopefully correct ) rings at the moment. Once I have those cut, and verified the measurements, I'll post pics and measurements.
46mm ring....cut in the middle, spread apart by 7mm = 53mm Which is Ballpark, just like the article says. (They end up being closer to 55/56 dont ask me while its a FLAT thing glued on a ROUND thing mystery, which is why I suggest the vacuum formed version)
I'll edit it to make it more clear because I can understand the confusion.
Any other suggestions for the tutorial are also welcome.
;-)
Frank