Completed my first project on 5Pro. It is just a simple bit and collet holder. I wanted the holes for the bits to be 13mm x 13mm but they came out at 11.88 x 11.88 mm. The holes for the collets also were too small. Expected = 24mm x 24mm and results was 23mm x 23mm. Please let me know what I did wrong. File attached. Thanks in advance.
bit holder3.c2d (84 KB)
What material are you cutting?
Photo of how the project turned out?
How are you measuring?
Did you use a #201 endmill?
One easy change to make is that the Depth per Pass, 1.524mm almost perfectly fits into the depth of the pockets, 12mm:
1.524 * 7 == 10.668
so the last pass is a full depth pass.
Changing the Depth per Pass slightly, say to 1.49 will add one pass, and that will instead remove:
1.49 * 8 == 11.92
and having a final pass which removes only 0.08mm of thickness.
I made some slight adjustments (including your recommendation) and got what I was trying to get. However I don’t understand what made that change work. I initially used the stock settings.
Tool/material deflection.
When the tool is making a full-depth pass, the cutting forces are sufficient to push the tip of the tool where the cutting is happening away from the material, and possibly even to slightly compress the material — when the tool is not removing as much material with what is essentially a finishing or spring pass with very low cutting forces, then the tool is not pushed aside, and cuts to its true diameter.
Note that climb vs. conventional (the direction of the cut relative to the material) will influence this as well.
For more on this see:
Thanks Will, that helps. I will review the additional information as well. As always, really appreciate your feedback.
Sometimes just run the path twice, cleans up the fur.
I would seal it with sanding sealer. MDF absorbs moisture and swells.
Thanks @jtclose, I think the biggest problem was just a newbie design issue and setting the dimensions too tight. I will keep your suggestions in mind for future projects. Thanks for your feedback.
How come I did not know that site! all one needs to know!
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