Why do I suddenly get 0 rpm in G-Wizard for certain combinations?

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Bob,

I have a Gwizard question…

When I am calculating speed/feeds on smaller drills, very long drills, and sometimes with certain end mills I get either no results (zeros), or I get minimum RPM error. My minimum speed is 100RPM, but I should be far above that speed. If I play with various cut depths I can make the calculator work, sometimes just changing the cut depth by .1″ will make me loose my results.

Any help would be appreciated!

Thanks,

Josh

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This mostly happens with twist drills.  When G-Wizard finds a cut it thinks is completely untenable, it sets RPM to 0.  There should be a message in the Hint area that suggests why.

It may be possible to drill a hole deeper than G-Wizard will give feeds and speeds for, but you will have to develop a method that is trial and error.

Having a custom deep hole cycle will help you to get there.  Our G-Wizard Editor can create custom deep hole cycles.  For more information, see this page:

http://blog.cnccookbook.com/2013/01/25/custom-deep-hole-cnc-canned-drilling-cycles/

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