I am attempting to do a production run of a part in 1/2” cherry that would benefit from finish-ready through-cut profiles (no tabs). I am currently using a 1/4” Cadence MFG Jenny compression bit for this, but am having issues with the end grain of my piece. After rough cutting a 0.020” offset profile, I come back in for a full-depth finishing pass with the Jenny at 16,000 RPM and 50 IPM (conventional cut).
The resulting edge grain looks great, but the end grain is left with a line pattern where the bit’s flutes flip from up-cut to down-cut. The profile itself is smooth, so I imagine that the pattern I’m seeing is from burning/burnishing? This sands out with some effort, but I would like to avoid this extra step.
Before I go down the rabbit hole testing various feeds and speeds, can anyone recommend a starting point or other remedies to try?
Looking at this in more detail, I think that the bottom most line might represent the transition in the bit (as there was some cut through into the wasteboard). Regardless, wondering how best to avoid these streaks in the end grain.
That’s likely the simplest workaround, though fewer tool changes is always preferable. I found the suggested feeds/speeds on the bit manufacturer’s site and realized that I’m way off. Will try some test cuts over the weekend.
Likely a nick in the cutting edge or in the transition from up to down. I use an eye loupe to check my tooling. An endmill might “feel” nice and sharp with good corners but you might be surprised how horrible it looks under 15x magnification or better.
