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Why do I not get a helix with open pockets?

4 REPLIES 4
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Message 1 of 5
janus2
357 Views, 4 Replies

Why do I not get a helix with open pockets?

Hello!

I have already milled quite a bit with success in Fusion 360.

But now I have problems with open pockets. Partly I don't get a helix and the cutter do a plunge full into the material. I have attached a simple example. While everything is fine with the closed pocket, there are problems with the open pockets.
Why do I not get a helix on open pockets?

 

Or is there a better way to mill such a part?

 

Thanks for any help
Jan

4 REPLIES 4
Message 2 of 5
engineguy
in reply to: janus2

@janus2 

 

2D toolpaths are not "Model aware", you have not removed any material around the example part, to have the open pocket start outside the stock then under the Links tab select "Plunge Outside Pocket" instead of Helix and the toolpath will start outside the stock, see images below and attached file. Would usually be best to remove all the excess stock first IMHO

Open pocket-1.jpg

 

Open Pocket-2.jpg

 

Message 3 of 5
janus2
in reply to: engineguy

@engineguy 

Thank you for your explanations. That makes sense.

 

Although I can't understand why there is such a difference between open and closed pocket.
The Helix option is selectable, although it does not work on open pocket.

 

I have found 2 other solutions in the meantime:

 

1. Create a sketch with the desired milling area and use this sketch as a closed pocket.

2. Use 3D pocket.

 

As always: There are many ways ......

 

Thanks a lot
Jan

Message 4 of 5
HughesTooling
in reply to: janus2

If you enable Stock Contours the pocket will be extended to the edge of the stock.

HughesTooling_0-1617361826838.png

 

Or where you hoping to fully machine the pocket and stay within the stock, then yes 3d pocket is really the only option. 

HughesTooling_1-1617362168087.png

 

 

Mark

 

Mark Hughes
Owner, Hughes Tooling
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Message 5 of 5
danfieldTVSXX
in reply to: engineguy

Sure this can work in this example but what if your clamp is there.   In my case that is where I have to clamp, not enough material on the sides.   Fusion is lied to about how much Stock is actually there.    As of now, April 2023 there is an option as a closed Boundary when selecting Geometry but that was no help, I thought that would Contain the tool.   I think I am going to try the next solution adding a closed pocket by the OP, sounds hopeful.    As it is, 1/4" 2 flute endmill doing about 3/8" deep into hardwood is not a problem, it's just the first move after the plunge, oh my. 

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