Powermill surface projection finishing. help

[Anonymous]

How do I use surface projection finishing? thank you

[Anonymous]

That's a very broad question I'm afraid. 

https://knowledge.autodesk.com/support/powermill/learn-explore/caas/CloudHelp/cloudhelp/2019/ENU/PWR...

^---- This is the most general to get you started.

You'll likely also want to look plane projection as well since they have alot of similarities.

[ksorbo6]

What kind of toolpath are you trying to get in the end?  Is it meant to spiral around the entire object?

[Anonymous]

Exactly I want to do that. It's like using a rotary strategy.

[ksorbo6]

So you'd  have to create a dome-shaped surface, either inside or outside of the part, in whatever 3d program you have, and then import that in as a reference surface. But for this piece it seems like a point projection would work too - surface projection just gives you more precise control.

Then you'd maybe play with your tool axis settings. Lead/Lean -> Preview Frame Normal to have it stay perpendicular to the reference surface, or maybe towards line for a more simple rotary. Depends on what kind of machine this is.

[Chetan.Bankar]

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@Anonymous wrote:

How do I use surface projection finishing? thank you

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Hi @Anonymous,

Welcome to Autodesk PowerMill forum community.

As rightly mentioned by @ksorbo6 you will need to create a cone or dome shape surface (In 3D CAD modelling software such as PowerShape) around the model to be machined. This surface can then be imported into PowerMill project as a Reference surface to be used in surface projection finishing.

Also you will need to set the workplane at the bottom center of the model with Z axis parallel to the side of the model about which you need a rotary toolpath. 

I have found a video on youtube which will be of some help to you. 

Thanks and Regards,

[Anonymous]

thanks everyone. But I still can not do it

This is the model to runThis is the surface I createdtoolpath

Can anyone give me suggestions?Thank you

[Anonymous]

You'll have to excuse the place holder models. I know yours has some undercuts and such that will be likely harder to get at.

In this case it sounds like you want a toolpath that starts at the top of the head and then spirals down the model. This is a very rare case where I would probably use Point Projection.

The other option  is to create a dome over the part and use a Surface Projection Finish with a U pattern Spiral. The dome you create is converted to a reference object and will not be machined, it's there just as a support for the model in general.

[ksorbo6]

To get it to spiral, I *think* your reference surface needs to wrap around itself like in this picture, with the seam vertical. That I just made with a revolve command. And then also check "spiral" and use the right direction, U or V, like you see in ribble's picture

[Anonymous]

Vì vậy, vấn đề là khá khó khăn. Bởi vì bề mặt là một bề mặt phức tạp