Problem with wobbling
It would be helpful to post a video of it running but it's probably wobbling when it's helically ramping and rapidly changing direction at that sharp point. I'd slow the feedrate down or put your machine on a sturdier table. Maybe model in a fillet at that sharp corner preferably larger than your tool.
Maybe specify a minimum cutting radius and then finish that portion up with another toolpath that has a much slower feed:
Then on the slower follow up toolpath enable rest machining:
Or use feed optimization to slow the tool down in that corner:
It's also possible your machine just can't handle a tool that large. An 8mm tool cutting 5000mm/min 3mm in deptch might be too much for your machine to handle. Does the spindle sound like it gets bogged down at all?
You also might need to hold your part down better or use a downcutting end mill.
I f you enable points in the view setting on the toolbar bottom of the screen you can see you have a lot of short moves.
I've disabled multiple step downs to make it easier to see. With the standard smoothing set to 10% of the tolerance you don't get much arc fitting. Total tolerance 0.11
If you set the tolerance to 0.05 and smoothing to 0.05 it's a lot better and a lot less points. Total tolerance is only 0.1. Try these tolerance and see if you get a smoother cut.
Mark Hughes
Owner, Hughes Tooling
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You can get even better arc fitting if you tighten up the tolerances even more, try a tolerance of 0.002mm and smoothing of 0.01mm. Also the feed optimisation is adding points so might not be helping.
With the tolerances above and feed optimisation.
Without feed optimisation.
Unfortunately smoothing is not going to work with a ramp toolpath. The ramp will be calculated using the tolerance, so 0.002mm will create a lot of points but if you increase this the smoothing will not work as well on the profile when it reaches depth.
Here I've played around with tolerances to get good arc fitting on the flat profiles but the ramp does not fit at all so you get thousands of moves on the corners!
Part of this problem goes back to the way Fusion offsets splines. Unfortunately when Fusion offset a convex spline it creates a corner rounding fillet between each move and this kills the arc fitting in smoothing. You can workaround this if you use a very tight tolerance around 10 times smaller than the smoothing tolerance. This works well in the pocket but not on the ramp.
Maybe you need to look at the controler on your machine and see if it has any inbuilt constant contorting settings. What control are you using?
Mark Hughes
Owner, Hughes Tooling
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Sorry don't know anything about that control. Might be worth asking the manufacturer if there's any settings for this sort of toolpath.
Just to show the difference between splines and arcs I redid your model. It doesn't quite match but shows how simple the toolpath is using simple lines and arcs. File's attached.
Mark Hughes
Owner, Hughes Tooling
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@samihofert wrote:
Maybe the link to my machine helps: https://www.mekanika.io/shop/evo-3545#attr=
I had a bit of a look around on their website but couldn't find any info on programing the control, is there a g code reference anywhere?
Mark Hughes
Owner, Hughes Tooling
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You can show points from the toolbar bottom of the screen.
Mark Hughes
Owner, Hughes Tooling
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