Flat Pattern

[TheePres]

Has anyone came upon situation like this one:

I have a part with a profile on a curved surface, we want to mill contour part in straight condition and the form part to curve wich is a spline, not true arc. How would I straighten geometry?. I up-loaded part to FTP site, under MC8 directory..7154_model.mc8.

Also, would someone show me how to make a link to this.

Thank You

P.S., I tried it below

7154model

[Charles Davis]

There is a C-Hook function called Map.dll, but I've not had a lot of success with it, as it tends to distort the geometry (I think this has to do with the way it maps curves from the UV's of one surface to the other).

It sounds like your best bet is to just use Analyze to find the length of the spline, and use this value to create a line representing the rolled out line.

p.s. I did not look at your file, so just going by what you said in your message.

[TheePres]

I apologize, there was error in file, look for 7154_MODEL2.MC8

[Chips Ahoy]

I have to do this once in a while when I get Iges files. I take the file and use the c-hook squash and the take what I get and roll it around a diameter that I need to have my profile on. ???

[cadcam]

I am with you ricky love that c-hook.

[Simtech]

Flatsurf C-Hook works on this part. Sample attached. Surfaces were not trimmed.

From Dave Thompson a while back:

 

When surfaces are trimmed, you have to (this is a bitch):

-Create/Curve/Const param/Options/Entities/Surface curves (only)

-Create/Curve/All edges/all surfaces

-untrim the surfaces

-flatsurf.dll to flatten

-use map.dll to map surface curves between the wrapped and flat surfaces

-con2spl to make splines from surface curves

-trim the flat surfaces to the new spline boundaries

[Allan Brown]

[Without looking at the part...]

The Flatsurf C-Hook will flatten surfaces. These need to be untrimmed. The Map C-Hook can be used to map the trimmed surface boundary curves down to the flattened surface, so the surface can be properly trimmed again. A few tricks are required along the way to convert curves to 'surface curves' so they can be mapped properly.