I was not able to cut your multiple part but was able to cut one ….I think I ran out of memory or something….I have only cut aluminum and your step over and step down is way more than I use and perhaps that is why you are breaking bits…..I work in inches so that is what my “mod” file is.
workspace_Clamp_A mod.kmz (164.4 KB)
Looks like you were cutting lots deeper. The parts and stock are 12mm - about 1/2”.
yes but just example of aluminon cutting…… .01 step down…. .2 or .3 step over in inch lots of passes. that was 16k rpm 1/4 4 tooth endmill for single tooth 1/8 I use 25k rpm.
I make a dual dimensioned drawing and position my zero with it as typically I use 1/4 shank for electronic zero probe x y and then if using 1/8 cutter have to change cutter and prob z. I wrote g code for the x y probe and add radius for center location. Lots of steps…don’t forget to re-zero when prob x y
Thanks. My Carvera Air is limited to 13K RPM. The spindle speed, step down and step over for 1/8” bits is pre-set for each material. I use those settings in KM.
I miss spoke your .25mm step down is great (.009 in) but .7 step over is (.7x.125=.090”) (2.22 mm) which is way more than my .2 or .3 (.025 .040 inch)…..if you are not breaking tools I may try it. Let me know
I might get a chance to try cutting again this weekend.
did the other recomends .7 mm step over…Kiri is different not in mm for step over
step over is a factor of tool flute diameter so 0.7 is 70% of flute diameter. the only exception are taper mills. for those, the step over is absolute workspace units
The step over factor is also a percentage in Makera CAM.
There are speeds & feeds calculators for a general idea:
The CNC routers are not as rigid as a conventional CNC machine tools…so I wonder if this calculator is a little too aggressive for aluminum….or in other words with the small chip loads for aluminum does it matter?
Generally I think if you have time to spare it’s better to go slower to begin with, and then slowly try faster speeds if you want to.
