NX 11 Swept Volume problem: Design cutter

[SebatianP]

Hello Experts!

I'm struggling with design of cutter which is made by passage of special cutter on corresponding helix (1.png).

Swept volume doesn't support this kind of bodies (concave, 2.png). I tried to use swept of section of special cutter and vector direction along the helix, but the resulting body is wrong.

I was able to prepare a sample shape, but with wrong surface (made with multiple bodies on pattern substracted from cutter). (3.png)

Images and nx files in the attachment.

Thanks for any help.

[Redwald]

Hi Sebastian,

Looks like from your screenshots, your tool body has concave faces. 
Tool body with concave faces only works on tool paths that are planar.
This is a current limitation of Swept Volume, unfortunately.

I will investigate further and if I have some new information I will let you know.

Thanks

Red

[Paul_Hartrick]

In stead of doing the pattern of the body you can pattern the section curves then do a sweep through the patterned curves. This will give you clean surface you can trim the body with.

[SebatianP]

Thanks for quick replies.

At first I tried Your method, but it gives wrong body, please look on screen 4.png. Normal vector of tool section isn't tangent to the guide curve (tool is angled to the cylinder) this makes that swepable section isn't planar. It is similar to green/red curve made from patterned tool body, look on screen 5.png. Proper section lies in the concave beetwen red and green lines.

I attach comparison of body made from section pattern (swept) as grey to body made from tool body pattern (geometry pattern) as brown. (4.png)

Brown body is correct, but I can't optain the smooth surface.

Regards,

Sebastian

[Paul_Hartrick]

Can you attach the prt file that has the booleaned brown body?

[SebatianP]

I attached prt file.

Regards,

Sebastian