Originally shared by Henrik Larsen
Today I milled mild steel with my DIY CNC. I needed to make a bigger hole for my hinge adjustment tool.
Why not try using my CNC. I did and it worked better than expected. The finish is perfect and the machine didn’t complain about the hard work.
I expanded the existing hole from 1mm to 1mm taking of 1mm width and 0.5mm in depth. I had to do this from each side of the tool since the hole is deeper than any of the milling tools i have available currently.
In the first run I used a 4mm two flute carbide end mill running at 5500 rpm and 200 mm/min feed. After the job finished i noticed that one flute tip was broken.
Then I found a 6mm 4 flute carbide endmill and milled the hole finished from the other side running at 4000 rpm and 200 mm/min.
Both jobs sounded fine and finish was perfect, although the tool was hard to mount since the ends was not square with each other, which caused the hole to be misaligned a bit. This does not matter for the functioning of this kind of tool.
What did you use to create your tool path? Any lessons learned from this little project?