The splintering is going to happen in the direction of the grain. Just saying that most people look at the grain... but to confirm just take you fingers and while rubbing it along it back and forth feel how it catches.
There's another way to prevent any splintering or breakout... Take 2 strips of paneling (1/8" thick) to use as a sacrificial backing... and use double-sided tape to temporarily encase the edge you will route (adjacent sides). It will help hold it together as you route your profile. Use once, the excess on that sacrificial backing will be routed out of the way. So you can resue that backing on any of the same later profiles will take less time... and you have a visual guide of the profile.
I used to just use masking tape to try to keep it together... That somewhat works, but doing that gummed up my bits so bad that I spent more time cleaning that up than I did cutting the profiles. That doesn't work for me.
One tip- dress up your bit to make sure it's sharp. That does help on fir and hemlock.
On bearing guided cuts, I do use a climb cut (because any backing would throw the profile off) and yes there is a risk to that... I try to reduce that risk by using shallow depth of cuts until I get to the finish cut.
Fir is okay and cheap. Sure you wouldn't want to go with poplar or ash? Not much more in cost, but tighter grain...
"Don't worry, I saw this work in a cartoon once."
"Usually learning skills and tooling involves a progression of logical steps."
Last edited by MAFoElffen; 10-25-2014 at 11:30 AM.