Re: [CAD_CAM_EDM_DRO] Re: feeds and speeds.

I'll have to emphatically disagree with you regarding point number 2. I
frequently machine aluminum on both my mill and lathe. If I don't use
coolant, the aluminum will heat to the point where particles of aluminum
will stick to the cutter and interfere with cutting. If not caught
immediately, this problem can evven lead to forcibly moving the part in the
vise or chuck jaws. Incidently, I use kereosene for coolant as it takes
very little to eliminate the problem.

Smoke

>If you find aluminum gums up and frequently makes a great mess....
>
>Three things maybe wrong.
>
>1)The cutting speed: "You can ever cut too fast for aluminum", works
>for me.
>
>2) Cooling and lubrication: Because aluminum is such a good heat
>conductor, and because you are feeding so fast, it is unlikley home-
>machinist would need coolant. Lubrication is only useful when you are
>in a blind hole and need the chips to move out easily.
>
>3) Climb-milling. You need to feed the part in the direction that the
>tool is throwing the chips back into the direction of travel. (Try it
>both ways to see the difference!)
>
>Tips:
>High helix end mills are best to clear the chips out quickly.
>Use a vacuum cleaner in the same flexable pipe that is normally used
>to feed coolant, don't let the chips get back into the work area.
>
>It is worth while to make a test cut. Change these three parameters
>as you make a long cut.
>
>The model I use when someone describes aluminum as gummy is if you
>drag a sharp knife slowly through clay, it will gum and clump, but if
>you go fast the clay turns hard to the tool.
>
>Buck
>
>
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