I want to put up a stud wall to make a walk in wardrobe. I want to get a flush joint against the wall but I have some molding across the top. I was wondering if there is an approach to cutting a grove/slot in it without removing it, it's quite a long piece 15+ foot so ideally I want it to stay where it is.
Wood – Cutting Ceiling Molding Wihtout Removing It
woodworking
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Looking at the page you linked to, it looks like it will do the job for you. It has a 1/4" shank which might limit you down the road if you decide you like building things and start doing it all the time.
A rabbet bit goes against the work piece like this:
The dimension B is determined by the size of the bit; you can make it smaller by putting something between the workpiece and the bit; you could use another bit to cut out more, but that makes the whole job a lot trickier because you won't have the bearing on the bit to help guide the router. You have control of dimension A; you make the cut deeper by running the bit over the workpiece multiple times, cutting a little bit more each time.
Other items you'll need are safety glasses, a vacuum cleaner to collect sawdust (it's a carcinogen so don't want to be breathing it) and clamps to hold the work piece.
You need clamps because operating a router is a two-handed job: plunging the router with both hands means that you have even pressure on each side of the bit thus more control if it kicks and it keeps your hands out of the way of the fast-moving machinery.
If you don't already have something sturdy to clamp the workpiece to, you should probably think about getting a workbench. A dedicated routing table is another option, but probably more than you need right now (I'm just now getting to the point where I'm thinking I'd like to have one so can't advise you there).
Wood can be one of the most challenging materials to laser engrave. This is mainly due to the inconsistencies in wood. As you can see in the above video and images the engraving results can vary even with similar color wood types. Here are a list of qualities to look for in selecting wood for laser photo engraving. Ideally the wood will have a high resin content, be light in color, and will not have a coarse or heavy grain.
Laser Engraving Wood Comparison Video
Laser engravers work by burning into the wood; as the link notes, you'll want a wood with a high resin content so that the laser has something to "color". A soft wood such as Cedar, Pine or Spruce would be a good choice also as their "softer" and can be burned easily.
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Best Answer
One approach to this problem would be to use an oscillating tool, of which there are many brands available. Different blade options are provided with the tool, including a toothsome flat blade with a square face.
Home Depot is one source of these tools and blades:
It won't necessarily be fast, but it will be a clean cut (depending on operator skill). If you need a cheap solution, Harbor Freight is likely to be a good source. They have a twenty dollar (US) tool that does not specify that it comes with the cutter, but those are seven bucks each in the same location.