Should "Keep tool down" work for MillFace?

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more11
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Re: Should "Keep tool down" work for MillFace?

Post by more11 »

The proper way to do it is to run conversion when the input file is in the old style.

I use only 0.20 for paths. For design I use 0.18 because of bugs in 0.19 and 0.20.
Point taken :-)
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Re: Should "Keep tool down" work for MillFace?

Post by chrisb »

more11 wrote: Thu Jan 26, 2023 10:47 pm For design I use 0.18 because of bugs in 0.19 and 0.20.
Which bugs are you talking about? Are they known? Are there bug tickets?
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jbraun
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Re: Should "Keep tool down" work for MillFace?

Post by jbraun »

I'm not seeing this problem in the latest appimage or maybe I have not chosen the combination of parameters to recreate the problem.
With a face offset pattern, toggling 'Keep ToolDown' to 'true' retracts at start and end. Setting to 'false' retracts at every stepover.
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GeneFC
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Re: Should "Keep tool down" work for MillFace?

Post by GeneFC »

more11 wrote: Thu Jan 26, 2023 10:47 pm
If you want to fix this issue change the stepover to 70% or less. Or use a different pattern.

The reason for the jumping up and down is that a very large stepover leaves tiny unprocessed triangles at every corner. When the offset pattern moves to the adjacent orbit the tool needs to be lifted to avoid the "unwanted" triangles.

This is a purely geometrical effect, not a bug. A circle moved in a rectangular pattern cannot fill all the area when the stepover is greater than SQRT(2) /2.

I should have caught this user error the first time around. :oops: :lol: :oops: :lol: :oops: :lol:

Gene
more11
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Re: Should "Keep tool down" work for MillFace?

Post by more11 »

chrisb wrote: Thu Jan 26, 2023 11:15 pm
more11 wrote: Thu Jan 26, 2023 10:47 pm For design I use 0.18 because of bugs in 0.19 and 0.20.
Which bugs are you talking about? Are they known? Are there bug tickets?
https://github.com/FreeCAD/FreeCAD/issues/8116
Point taken :-)
more11
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Re: Should "Keep tool down" work for MillFace?

Post by more11 »

GeneFC wrote: Fri Jan 27, 2023 3:03 am
more11 wrote: Thu Jan 26, 2023 10:47 pm
If you want to fix this issue change the stepover to 70% or less. Or use a different pattern.

The reason for the jumping up and down is that a very large stepover leaves tiny unprocessed triangles at every corner. When the offset pattern moves to the adjacent orbit the tool needs to be lifted to avoid the "unwanted" triangles.

This is a purely geometrical effect, not a bug. A circle moved in a rectangular pattern cannot fill all the area when the stepover is greater than SQRT(2) /2.

I should have caught this user error the first time around. :oops: :lol: :oops: :lol: :oops: :lol:

Gene
Thanks Gene! I will try it
Point taken :-)
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Re: Should "Keep tool down" work for MillFace?

Post by GeneFC »

more11 wrote: Mon Jan 30, 2023 6:50 am
This comes up from time to time. Here is a sketch showing the problem.

Stepover.jpg
Stepover.jpg (78.83 KiB) Viewed 629 times

A large stepover works for straight lines, but not for 90 degree corners. 100% stepover would (barely) work for obtuse angles of 120 degrees or greater.

Gene
more11
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Re: Should "Keep tool down" work for MillFace?

Post by more11 »

I tried 70% and the tool is kept down.

But the triangles will be there if 80% is used regardless if the tool is kept down or not, at least in three corners.
Point taken :-)
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