Morph Strategy direction control issue

[jason11]

I'm constantly running into an issue when i use the morph strategy on a lot of parts we machine.  I'm machining them on a 5 axis machine, so i'm able to tilt the part any way i want in order to cut with the side of the tool vs. the tip.  The issue is, the software always generate the toolpath from the highest z point to the lowest z point.  No matter what direction i choose for the drive contours, and whether i do both way machining or one way machining, it always starts at the top and works down.  The toolpath gives me the look i want, but the surface finish is horrible due to it driving the tip of the tool into the part and re-cutting the chips and causing chip welding.  If i could cut from the bottom up, the surface finish would be 100 times nicer due to it having room to evacuate the chip.  I need some form of option to cut bottom up like other tool paths have.  

Or...is there a way in the post processor to reverse the toolpath since it is all just a series of linear movements anyway?  I need some serious help with this to make these parts look better.  

I've attached a screenshot of what i am talking about.  

Thanks,

Jason

[seth.madore]

Any chance you could share the file?
Right click on the file and select "Share Public Link"

If you don't want to share it publicly, just email me the link.

seth.madore at autodesk.com

[jason11]

Seth,

Email sent!  

Thanks,

Jason

[pgYLCY4]

Did you solve this problem?  I have the same question and have been pulling my hair out.

[stevedunf]

I too am having this issue. Has anyone found a solution yet? 

[seth.madore]

@stevedunf could you share your Fusion file here?
File > Export > Save to local folder, return to thread and attach the .f3d file in your reply

[stevedunf]

Thanks,

Here's a file with multiple toolpaths.

A 3d Contour that doesn't follow the curve tightly but can start in the ideal lowest corner and work its way up.

Multiple Morph paths with different settings all starting on one of the highest points. 

Oddly "One way" and "other way" paths don't seem to change whether up or down milling.   

I suppose its standard diagnosis but I'm not sure what can be found in our files if "bottom-up" or "reverse toolpath" options simply don't exist.  

[seth.madore]

@stevedunf 

So, what are you actually looking for? Some of your toolpaths seem to address what the OP was looking for, but I sense that you expect to see something different?

[stevedunf]

I'm looking for the toolpath to start at the lowest Z point.

What did you think OP was asking for when he wanted to reverse a path that went "from the highest z point to the lowest z point"?

None of the Morph toolpaths in my file start in the lowest corner.  The surface is angled in two directions, so in one direction the tool is moving up while cutting, in the other it is still moving down.  

(I haven't tried a single angle because it isn't relevant to my work) 

In a perfect world I would like it to operate like a parallel path that can follow a curve, so I can say "Start here at this end of this curve" and it will make sequential passes offset by the stepover amount across the shape until it reaches the other curve. 

Morph doesn't operate like this unless the direction you want is from high Z to low Z. Sometimes, as in my example it will even start in between the curves if it is a high point and work its way out to the contours, but it won't work its way from the contours->in if they are lower, or one lower contour up to the higher.   

Again "One Way" up/down-cutting provides the exact same toolpath as "other way" up/down-cutting.  I'm pretty sure one is supposed to go the other way, which may be a solution.  

[holen.borge]

Yeah, morph seems to be a bit broken. It starts at the Ztop and works downwards. Gives out a pretty lousy surface.

Up down one way or the other gives the same directions but with some weird stops and shift in direction where is is really not obvious

[dzimnicki]

Try Geodesic - Offset Passes Using -> Curve selections. Select lower curve

[seth.madore]

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@holen.borge wrote:

Yeah, morph seems to be a bit broken. 

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Could you share a part that demonstrates this broken-ness?

File > Export > Save to local folder, return to thread and attach the .f3d file in your reply

[holen.borge]

here, same file as posted a bit further up describes the problem perfectly.

You cannot get the tool to start at the lowest Z point. Which of course would give the best surface in nearly every incident using a ball mill.