I just wanted to share something I had learned in my attempts to cut 1/4" purpleheart hardwood. It is notorious for giving EVERYBODY issues, but I believe I have figured out the trick. It will still require a little cleanup to remove excess char, but the edges are clean-cut with only a little force needed to push it out of the surrounding board. I’m not an eloquent writer, nor does this really need a massive write-up, but I’ll give some explanation as to how I got to these settings.
I discovered that purpleheart cuts better HOT than cold. I first tested just a line, with the settings above. It cut remarkably well and was cleaner going AGAINST the grain as opposed to WITH. Then I tried a circle using the settings above. Purpleheart gets hot when cut; it holds energy well, which I believe is why it chars so much. I went ahead and tested what would happen if I cut a circle with one pass, let the wood cool, then repeated it twice more. It did NOT want to cut, and started smoldering. It came nowhere close to cutting through!
This all started because I was trying to cut out an image that had 5 different sections to be cut. What I discovered was that instead of letting it cut all the shapes once, then repeating, I needed to cut each shape individually with the 3 passes at once. So I changed all the cut lines into different colors so that they would cut individually.
Hot Purpleheart for the win! I hope this helps somebody out C: