Semantics, regionally meaning the same thing... Groove, mortise, spline, dado... We all seem to understand descriptions.
Is it a full groove the length of the stock or partial, like a blind dado?
*** here is what is going on and the why of it:
You are using a 1/4" bit in one pass to create a 1/4" groove. Most likely to break out in some woods if trying to cut that in in one pass... Reason for that, is one side of the bit is traveling the feed direction of the cut and the other side of the bit is moving in reverse direction of how the cut should be fed... That off-side is likely to break out and have scorching. See below to get around this by other methods.
- Agreed that a slot cutter is less likely to break out than using a straight bit.
- Dado's are less likely to break out it you route with a slightly smaller bit and do in two passes, one pass each direction.The first pass with have slight break out on one side. The second pass goes in the opposite direction / the correct feed direction for that second side, cleaning up that side.
- Past experience shows me that a spiral bit in one pass- if an up-cut spiral is going to be less tearout than a straight bit if only in one pass. And if you go with a slightly smaller bit in two passes... BUT- Depending on the wood and how sharp, a down-cut spiral is less likely to tearout than an up-cut spiral, but you have to watch that the sawdust doesn't built up too much. Down-cut spirals are also good for doing dado's where there is a veneer, as it has a tendency to push the veneer to the other wood as is cuts, instead of an up-cut that will have a tendency to pull on that same veneer. Be cautious on using a down-cut bit as (depending on the wood) it may have a tendency to try to float or lift a router (if hand held routing) or your work-piece (if table mounted routing... Because the cut is pushing against the work-piece. It's a different feel than most people are used to, but you just need to be aware of how it works and adjust to it.
- Then again, it could also be cut with a dado stack, but don't know how popular they are in Israel... I think grooving blades are easier to get on that side of the pond, but are pricey.
- About 10 other ways to do it...
"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; 08-03-2013 at 02:22 AM.