CNC-Fräse: Unterschied zwischen den Versionen

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Warning:

=== Warning ===

Do not use a too low feed-rate!!

The cutting region of the milling head is microscopically round.

If the "Spanbreite", the thickness of the removed material, is lower that this radius,

most material is compressed and only cut if the compression force is to large.

This results in dramatic friction and hence only heats up the milling head.

The thought "Oh, the cutter is getting too hot, I can see burning marks in the side of the wood, I

have to reduce the movement speed" is deadly!!! You can decrease the spindle speed, and increase the movement speed.

The Heat produced while cutting depends on the friction. A second part is proportional to the volume of material that is removed.

Half the milling depth, half the heating! 25% sidewards instead of 50% sidewards cutting=half the heating.

Mill heads can break if the sidewards force is too large. So for tiny things,

the feed rate together with the spindle speed and the cutting depth should be reduced.

Pocketing plexiglass:

=== Pocketing plexiglass ===

* Choose engraving bit according to pocket size.

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Cutting GFK (glasfaserverstärkter Kunststoff):

=== Cutting GFK (glasfaserverstärkter Kunststoff) ===

(Acquirable at http://www.der-schweighofer.at/artikel/77271/gfk_platte_300x135x1.5mm)

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*Feed override: 75%

=== Aluminium ===

Maximum Millheadsize should be 4mm on our Machine!

We sucessfully tested a_p = 0.25mm with 6mm head - with and without cooling (cooling done by isopropanol)

Spanabfuhr is quite a problem and our machine is not as stiff as we would like to have it for milling aluminium. so larger a_p would not work because the millhead will be bend to much.

Better use smaller diameter of cutter and higher spindle speed + feed rate.

== Cutting Speed ==