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4th wrap inside cylinder

friesendrywall
Collaborator

4th wrap inside cylinder

friesendrywall
Collaborator
Collaborator

Perhaps I don't know the right google term, but I'm not figuring out how to wrap an inside cylinder, or otherwise figure out how to cut this part on a 4th axis.  Any tips to kick this off top dead center?

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johnswetz1982
Advisor
Advisor

Are you trying to cut this so that it is a negitive? I dont think you will be able to wrap it 180 deg like it is because the is geometrically impossible.

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friesendrywall
Collaborator
Collaborator

I’m trying to cut close to as shown. I know I can’t cut 180,  it I should be able to get 160 or so. I have shown two attempted tool paths that don’t work. The 2d wrap only works on the outside of a cylinder, not the inside. 

 

Im coming to the conclusion that fusion can’t do this.

 

So basically, if the center of the 4th rotation was around that cylinder, the tool would stay in one spot during the cut. It’s not a perfect cut because it would be rounded from the tooltip geometry, but it would be reasonably close.

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daniel_lyall
Mentor
Mentor

Have a look at flow it does a better toolpath with a 1mm ball mill than the endmill in your toolpath, I set the angle to 25 degrees for the max tilt and only this one with an angle and the WCS top dead center.

 

They have done a lot to the flow toolpath lately it's the, not 100% yet stuff but it seems A round surface will only do 4 axes if you find the sweet spot for the max tilt angle. for your model that seems to be 25 degrees. 

Screen Shot 2019-06-04 at 10.34.48 PM.png


Win10 pro | 16 GB ram | 4 GB graphics Quadro K2200 | Intel(R) 8Xeon(R) CPU E5-1620 v3 @ 3.50GHz 3.50 GHz

Daniel Lyall
The Big Boss
Mach3 User
My Websight, Daniels Wheelchair Customisations.
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friesendrywall
Collaborator
Collaborator

Well, yes, the flow thing sort of works, but only with a ballnose endmill.

 

If I want sharpish corners, the only way is to create an insert or to use square endmills with a toolpath sort of like I described.

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daniel_lyall
Mentor
Mentor

Not recommended 

There's nothing stopping you from lying to fusion As long as the diameter is the same it will be ok.


Win10 pro | 16 GB ram | 4 GB graphics Quadro K2200 | Intel(R) 8Xeon(R) CPU E5-1620 v3 @ 3.50GHz 3.50 GHz

Daniel Lyall
The Big Boss
Mach3 User
My Websight, Daniels Wheelchair Customisations.
Facebook | Twitter | LinkedIn

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