JoeChiOhki wrote:
There's a type of router bit, its used regularly in RV construction for cutting out Windows and vents in panel/plywood/etc... when RV's are constructed.
Usually a full sheet is installed on a wall, once its glue has set, a router is plunged in to cut out the wood over the window or other opening.
What kind of router bit is that? What is that normally called?
From when I watched them do it years ago, it seemed to have a roller or something of some kind on it to keep it from cutting into the framing when they removed the wood for the openings.
The specific bit you are asking about is actually called a "plunge" bit. It is used in CNC machines and free handed routers along with a collar/guide attached to the router base. Or it can be used w/o the collar by clamping a template down to the material and the solid portion of the shaft just follows the template. The bit has no bearing on the end of it, only a sharp end which allows it to be "plunged" into the material you wish to cut. I used it all the time for cutting out sink holes in laminate and corian countertops.
Some of the other bits mentioned by others are a little different in the design and have roller bearings or solid shafts at the end which allow the bit to follow an edge... like trimming laminate countertop edges. These trim bits can be used as a plunge bit if a hole is first drilled so the router bit can be dropped into the hole. But depending on what you are trying to accomplish the bearing on the end of the bit may get in your way.
Phil
