Smallest Reasonable End Mill

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21 Feb 2021 00:38 #199573 by Project_Hopeless
I modeled up a medallion of "Tux" to hang on my DIY CNC. He is only ~6" tall so a lot of the details are too small for my 1/8" bit.



I'm relatively new at CNC so I'm always nervous about breaking bits. For MDF or pine how small a bit would you recommended running?
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21 Feb 2021 01:18 #199578 by tommylight
You can always use a 1/8 V bit for that type of work, not the same thing but the end result is close enough.

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21 Feb 2021 06:36 #199580 by robertspark
+1 vbit

it will provide a better finish , the features will be supported and you won't have thin walls

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26 Feb 2021 01:20 #200164 by andypugh

Project_Hopeless wrote: I'm relatively new at CNC so I'm always nervous about breaking bits. For MDF or pine how small a bit would you recommended running?


I rarely go below 2.5mm, but I have a 1000rpm spindle.

Try a feeds and speeds calculator and see what looks reasonable for your spindle speed.

I imagine that a sloppy machine might break very small bits, But otherwise there is no reason to worry.

This chap thread-mills m2 holes on a full-size industrial mill: www.f1-2000.co.uk/index.php?f=conrods

I suspect the real limit is how long you are prepared to wait to nibble away the material.

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