Axis display tool path / part

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28 Dec 2012 19:33 #28116 by Rick G
When milling with AXIS you can display the tool path and if you select a tool the tool representation will change to the proper tool size.

The tool path and the tool path representations also changes when you use cutter radius compensation G41/G42.
linuxcnc.org/docs/devel/html/gcode/tool_...:cutter-compensation

This is great but the resulting part/hole may be different than the display as the display shows the tool path only, not the results.
For example milling a triangle from sheet stock going on the outside path around a triangle and the resulting part (inside) will have sharp corners , but the outside (hole) will have rounded corners.

It seems the option of being able to display the true resulting part/hole and their dimensions would be a great asset.

Rick G

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28 Dec 2012 21:27 #28119 by BigJohnT
It seems like you could do that if your using cutter comp otherwise the tool path is the center of the tool. The comments I get from commercial shops is they don't even want a back plot... go figure. For me I like to verify that what I programmed resembles what is displayed on the back plot.

John

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28 Dec 2012 22:57 #28124 by Rick G

For me I like to verify that what I programmed resembles what is displayed on the back plot.


Absolutely, my first cnc set up used a dos program that had no back plot at all. Worked O.K. , but we would load a pen in the spindle and run the program to see what the part would look like.
This was one of the main reasons for looking into EMC2.

Rick G

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30 Dec 2012 15:24 #28176 by Rick G
As an example below is a 3" x 4" x 5" triangle.
The center path is with no tool offset and the x and y dimension showed 3.00 and 4.00, the size of the part.
The smallest path is With a 1/4" mill offset to the inside and the dimensions are 2.75, 3.50.
The largest path is with a 1/4" mill offset to the outside and the dimensions are 3.50 and 4.50.
All the dimensions and the paths are correct in that they show where the machine will travel and how far, but they do not show the true shape or dimension of the finished part. When offset to the inside the corners of the triangle would be rounded due to the diameter of the cutter or when offset to the outside the corners would be sharp and the result would be a 3" x 4" x 5" triangle , not a 3.50" x 4.50".

Rick G

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