Author Topic: Small angles ignored ?  (Read 394 times)

Xylotica

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Small angles ignored ?
« on: April 21, 2022, 07:34:13 PM »
I am trying to fine-tune my tool ABC with a rotary planer, measuring the ridges between passes, and I'm just pulling my hair out.
I calculate the slight angular deviations from measuring precisely the height of these ridges in the wood I'm planing.
When I change the angle of my tool accordingly in KUKA|prc, I expected to see the ridges disappear, but it was like I peed in a violin as we say in France : no change.
So I checked the src files and noticed that when I was close to the vertical of the base, the small deviations were ignored : the SRC file has the same ABC values as for a vertical tool.
If I make a more pronounced angular change, then it registers...

Johannes @ Robots in Architecture

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Re: Small angles ignored ?
« Reply #1 on: April 22, 2022, 08:11:17 AM »
Hello,

I can say that there is some rounding happening because it avoids problems with the ABC calculations, but it should barely be perceptible, like the 5th digit after the comma for a vector. I'm happy to take a look at an example file!

But I learned a new expression today, so the day is already a success ;)

Best,
Johannes

Xylotica

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Re: Small angles ignored ?
« Reply #2 on: April 22, 2022, 08:38:34 AM »
There is definitely some rounding going on, but it's larger than you think.
In my case, the blue line is rotated 0.17° around A then the same amount around B.
It may not sound like a lot, but with a Ø80 planer end mill, it makes the difference between a flat board and one that requires lengthy sanding...

I'm preparing an example file.

Xylotica

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Re: Small angles ignored ?
« Reply #3 on: April 22, 2022, 09:05:55 AM »
I figured that under 0.806° of inclination with the vertical, the tool orientation is completely ignored.