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G-Wizard facemill Feeds & Speeds

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I have a 3″ facemill with 4 carbide inserts.  Since the holder itself is quite large, I’m just setting the stickout to .0001″ since deflection seems irrelevant.  The speeds and feeds output by G-Wizard seem very low, esp. when just specifying a very small DOC to level stock.

I’m also wondering what significance the lead angle plays in the calculation.

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It’s fine to ignore the stickout, even the default 1″ shouldn’t show much deflection on a 3″ facemill.

G-Wizard is conservative on indexable tooling because it has to choose the performance for the “average” insert.  The problem is that with so many inserts out there, average is very conservative.  You’ll want to enter the manufacturer’s recommended surface speed and chipload if you have that available for your particular insert:

http://blog.cnccookbook.com/2012/05/24/using-manufacturers-data-in-g-wizard-for-feeds-and-speeds/

Lead angle matters quite a lot.  The 90 degree default gives a square shoulder on the cut, but a 45 or 60 degree lead angle insert gives a nicer finish and can often be fed faster.  If you’re facing the whole surface and there’ll be no shoulders, it’s almost always preferable to have some lead angle less than 90 degrees.  This is all factored into the feeds and speeds calculation.

Here’s a post about the differences when face milling:

http://blog.cnccookbook.com/2011/02/06/45-or-90-degree-face-mill/

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