development tubes with factor k

[roccolaser]

Hello guys I needed a clarification, because already I made some cases in the workshop, when I develop a pipe with diameter 220 thickness 2 mm, what radius I have to insert and what value factor k I have to insert? to have a perfect diameter?

 

[Mike1967]

Hello guys I needed a clarification, because already I made some cases in the workshop, when I develop a pipe with diameter 220 thickness 2 mm, what radius I have to insert and what value factor k I have to insert? to have a perfect diameter?

the average radius (220-2= 218) which is equivalent to factor k 0.5.
you can control with the calculator: 218*3.14= 684.9 mm that must correspond to your development of the piece developed with swx (there could be some tenth difference because of the air that you leave in tracing the arc claws solidworks).
for the radius in the parameters by default I put 10, but it is insignificant, "read" what you put in the extrusion profile.
I considered 220 as an external diameter!

 

[roccolaser]

Thank you, mike. .