On 9/21/19 5:04 PM, John Dammeyer wrote:
The school does offer a java based computer science course, but I'm not
involved in that at all. For robotics, the kids use National Instruments
LabView and their roboRIO controller. Other mentors handle that. I
mainly work in the shop, helping the kids run the manual mills, lathes,
and of course the CNC Routers. We cut a lot of the parts for the robots
out out of 0.090 aluminum sheet, plastic etc.
Regards,
Andy
What sort of tool bits, RPM, feeds, depth of cut do you use for 0.090 aluminium?
Thanks
John
John,
We use single tooth 1/8" endmills, 10 to 15 thou depth of cut, 18,000
RPM and 20 IPM. Ninety-nine percent of what we do is cutting contours.
That includes things a simple as gussets, and more complicated bits that
are riveted or bolted together to make custom mechanisms for the robot.
Here is an example:
https://www.facebook.com/frc2468/photos/a.503283719718731/2074393315941089/?type=3&theater
We were using 2 and three tooth endmills, but they can't clear away the
chips fast enough, and the aluminum welds to the endmill. If the router
had a tool changer, then it would probably make sense to use a larger
endmill for most of the cuts. We just can't push the 1/8" ones very
hard. Higher quality endmills might help too, but each year we have new
students and numerous broken endmils :) That comes with the territory.
Andy
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