Creating a Helical Curved Surface
Creating a Helical Curved Surface
(OP)
I am having problems creating a helical curved surface like a screw thread. I cannot get the root diameter of the screw thread to match up with an extruded cylinder at the root diameter.
I cannot use a method where I create the tooth profile so that it is drawn below the root diameter because I am trying to produce a fillet radius without using the fillet function separately.
Can anyone walk me through the procedure so that I can verify what I am doing wrong?
Thanks in advance for your help.
I cannot use a method where I create the tooth profile so that it is drawn below the root diameter because I am trying to produce a fillet radius without using the fillet function separately.
Can anyone walk me through the procedure so that I can verify what I am doing wrong?
Thanks in advance for your help.






RE: Creating a Helical Curved Surface
Treat the part as if it were an actual solid bar being turned on a lathe & cut away the metal that you don't want, so that you end up with part you do want. This way your root fillet will be automatically produced ... just the way it is in the machine shop.
RE: Creating a Helical Curved Surface
Remember also that SW prefers some sketch inteference with the main body, compared to tangencies and collinear relationships. It handles the boolean functions better when dealing with curved or irregular surfaces.
Hope this helps.
Christopher Zona
Litens Automotive Partnership
Concord, Ontario, Canada
RE: Creating a Helical Curved Surface
I have tried your suggestion, and it has the same problem as when I create the profile as before.
If you compare the root diameter created by this method with a cylinder of equal diameter, there is a step present. The geometry does not match like one thinks it should.
This problem never used to happen in SolidWorks 2000. Any other ideas? I can email a file in SW2003 that shows the problem is you think that would help in dicovering the solution.
Just let me know where to email it to.
RE: Creating a Helical Curved Surface
Christopher Zona
Litens Automotive Partnership
Concord, Ontario, Canada
RE: Creating a Helical Curved Surface
Check out Thread559-90639, in particular the last few posts
RE: Creating a Helical Curved Surface
In short, you can't count on your tangent edges staying at the root diameter.
If you need a tangent edge at the root of your thread, start with a cut (like CorBlimeyLimey suggested). If you really need a tangency at the root, make the cut section sketch with a sharp corner at the root, and then add a fillet.
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