here is the promised link to my calibration files:
https://www.dropbox.com/sh/rlvbrzyrk...WwBUb1KRa?dl=0
one is gcode there other is a gerber
The gcode tests a range of speeds and depth of cuts doing zigzag tests as described here:
Calibrating Feeds and Speeds with Carbide Microtools (see patterns page | ZigZag) and is run directly on my CNC, you determine best quality and then use its settings in coppercam. I use this for new types of cutters and is a good way to zero in on a good feed rate and depth easily without breaking tips too often. Once you have it for a particular tool you won't need to re-run.
The gerber file and how to calibrate the cutter diameter is explained here
Calibrating PCB isolation routing with Eagle/pcb-gcode I just converted his file to gerber as I don't use eagle, that way it will read into coppercam easy, basically you put in the settings into copeprcam for the cutter and run the this grb, then measure under a microscope the actual width of cut, make diameter adjustments in the software to compensate, then re-run and hey presto your cuts should be correct widths. Its also a good way to test what the cutter is capable of.
The problem with Vbits are the width of cut can vary due to copper layer variation, how level your machine is and how deep you cut and is why I go for lower angle cutters of 10-30Degrees and shallow cuts.
Here are the settings in coppercam for my 30Degree tip which are these ones on banggood
https://www.banggood.com/10Pcs-0_1mm-30Degree-Carbide-PCB-Board-Engraving-Bits-CNC-Router-Tool-V-shape-p-1030786.html similar for 15Deg, and you can see the plunge speed difference because of the finer tip
here is the selected tool config for my last job I ran
Here you can see the sweet spot in the range of cuts for the feed and speed test, two different cutter tests here too btw, the bottom is 30deg bit from memory and you can see a marked difference in feed rates, while the top was a small bur cutter, size I can't remember but probably 0.6mm, but definitely gives cleaner cuts across a wider range of speeds than the vbit and the width is always constant no matter the depth, unfortunately can't get the smaller cutting widths like the vbit for the price
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0603 resistors and SMD tri-coloured LED does with coppercam using the settings above for a RasPi Cluster I'm building, excuse the hand soldering but was done at during one of our local maker meetups where I didn't have an oven or a microscope so was done by hand and my eyesight is crappy at the best of times lol