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feedgear - screw


this is a overview of what i want to make ,

View attachment 581

the sectional cut out of that "u"(blue) shape is what i need, but
you can see that as the spiral is generated that there is a contact
surface of the curve(red). ive tried to vary my cutout shape but
to no sucess. any ideas?

its made of a helical cut out.

with a variable pitch(almost spelt with a b)

used to move objects into appropriate spacing

if anyone has any material or information relative to making these things please let me know

(*note wish this window for writing posts could be resized*)

View attachment 582