Yes I understood that but am wondering when you would have a use for guide bushes if you invest in a flush trim pattern bit. Wouldn't it make the guide bushings unnecessary?
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Throw your guide bushing away if you want to. Most people would store them just in case they run into a situation where a guide bushing would be the best solution for the task at hand. But if your storage space is that limited, by all means just throw them away.
A router is a very versatile tool. It can be configured in many ways to accomplish a desired end product. BUT, it has limitations. A router is not a do everything tool.
Just because you might not realize a use for your guide bushings now, as you gain more knowledge of how to use a router, you may at some point figure out exactly how a guide bushing might be the perfect solution for a particular project.
If you are determined to use a router, the best solution I have seen so far, and it is the first thought I had, utilizes both guide bushings and a bottom bearing flush trim bit. Separately of course. Not during the same operation.
Use your guide bushing to cut as deep as you can using multiple passes. Then remove your guide bushing and pattern template. Insert a bottom bearing flush trim bit that is long enough to span the remaining thickness. Flip your piece over and use the edge that you just routed out as the pattern that the flush trim bit's bearing will ride on.
Also, on relatively narrow stock I would recommend using a router table rather than trying to hold the router by hand.
My thinking is that a router might not be the best tool to use to work on 2" x 6" material. Sounds like you need to invest in, or borrow, a band saw to rough cut the material close to the final dimension. Then use another tool, like a spindle sander, to bring the surface to its desired dimension. What you are attempting does not sound like the kind of thing a router should be used for or was designed for.
Yes they make longer bits, but extremely long bits on a router is not a safe thing. If you do go to a longer bit, please use a 1/2" shank and collet. Take it from someone that has had more than one 1/4 shank bit snap off in the middle of a cut. The amount of heat from friction and torque that a router bit undergoes is tremendous and weakens it over time. Be sure to wear your safety goggles. A router is a very dangerous tool.
Also with longer bits, you may experience more end play at the tip of the router bit giving less than desirable results. Probably can be addressed with sanding.