That's why I asked for the mechanical engineers among you to make some solidworks (or any other 3d) drawings and figure out all the dimensions. I have some simple and crude formulas for calculating diameters based on the drawings and photos I have so far.
The diameter of little rollers is ROUGHLY 34.09% of the screw diameter
the INSIDE diameter of the outer shell is roughly 163.18% of the screw diameter
thread depth on the screw is roughly 5% of its own the diameter
thread depth on one roller is roughly 14.66% of its own diameter
thread depth on (in?) the outer shell is roughly 3.06% of its own diameter.
So assuming a 16mm screw we have following:
screw ~16mm, thread 0.8mm, 5mm thread lead
roller ~5.45mm, thread 0.8mm, 5mm thread lead
shell ~26.11mm, thread 0.8mm, 5mm thread lead
Now, can someone with a bit of high-school trigonometry left in their memory confirm/deny this. |