After doing a bit of research on helical curve accuracy, I am starting to doubt the geometry created by my variable pitch curve. We are going to be driving cutter paths on CAM software with these models so the helix needs to be accurate.
We are making a constant diameter helix where the pitch varies linearly between the start and end of the helix.
I have done some extensive calculus to derive some equations that define the start and end pitch, and the curve itself in a polar coordinate system.
When I enter my start and end pitch into the helix parameters, the finish angle is not correct by enough to cause the design to not work.
Please see attached the first picture, which shows the equations for the curve, start and end pitch. The curve should rotate 100° during 100mm of vertical travel.
The second picture shows that over 100mm of travel, the curve on Solid Edge rotates 94.67°.
If anyone has any info, on how to make this work, please let me know.
which SE version and MP are You using?
I remember problems with the helix curve a few versions ago (ST9)
There You defined a 0.5 turns, but the curve itself opened about 200 degrees which definitively is more than a half turn