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Unread 19-01-2014, 12:32
sanddrag sanddrag is offline
On to my 16th year in FRC
FRC #0696 (Circuit Breakers)
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Re: CNC Feed Rate, and CAM software

Personally, I use FSWizard online for all my feeds and speeds calculations and I've found it to work quite well. http://zero-divide.net/?page=fswizard

I've done parts out of 3/16" 6061 aluminum plate, with a .25" 3-flute carbide endmill, 10% stepover HSM toolpath, 6000 RPM, and 144 IPM.

I'm setting up today to do our gearbox plates from 1/4" 6061 aluminum plate, with a .25" 3-flute carbide endmill, 25% stepover HSM toolpath, 6000 RPM, and 29 IPM.

Both cases have flood coolant, and both took the full thickness of the part in one pass. What I haven't tried is comparing the job time between say a 10% stepover and a high feed, and a 25% stepover and a lower feed. That would be interesting to see which is faster.

In aluminum, you're limited really only by your spindle RPM (for smaller cutters). Next machine I get will be 10k RPM.

As mentioned above, avoid slotting, and avoid straight plunging wherever possible The tool does not like either of these much, specially straight plunging.

What machine do you have?
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Teacher/Engineer/Machinist - Team 696 Circuit Breakers, 2011 - Present
Mentor/Engineer/Machinist, Team 968 RAWC, 2007-2010
Technical Mentor, Team 696 Circuit Breakers, 2005-2007
Student Mechanical Leader and Driver, Team 696 Circuit Breakers, 2002-2004

Last edited by sanddrag : 19-01-2014 at 12:36.
 


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