I'm pretty new to woodworking. For work I fall trees but when snow comes I have alot of down time so I am trying out some live edge pieces. Being inexperienced, I have been doing things the hardest way possible.....🙄 but found some videos on flattening slabs with a router. Can anyone tell me if a plunge router is a must or can you use a regular trim router? I have only seen it done with a plunge but is it possible with out?
I think you have already gotten some darn good leads for dealing with your challenge...(Thanks Tim for your kind woods...Blessing to you Brother!)
I noted you "fall trees"...???...Is this as a Forester or Arborist? I've worked in both fields and was the Tree Warden of my town for several years. Sounds like trees and wood are a big part of your life. Good for you!!!
As stated you don't have to have a plunge router, as any will do, but larger is better and a sharp bit is a must...Small routers are for small wood, and larger is a must for really big slabs...
I would be out of character (this will make most here either laugh at me or cringe...LOL) if I didn't suggest doing it traditionally just to get to know the wood and the traditional modalities. Yes, its takes some "elbow grease" to do it this way, but not as difficult as many think. I here folks all the time talk about how "hard it is to do," yet...when I ask how many they have done from beginning to end with only traditional methods and tools..the answer is always the same...NONE!!!
Now don't misunderstand my suggestion, it is work, but I can state it is the best way to..."learn wood"...and the art of woodworking. If you take a good and sharp scrub plane, you can work a big slab down in just a few hours if you are even in remotely good shape. I still work down large slabs (3' to 4' wide and up to 12' long) with just hand tools alone just to keep in shape and in practice for such tasks.
Now, the other method that combines power and hand work is to not use a router, but a small (or larger as our is over 12" wide) hand power planer. Then you just finish with the scrub plan, a smoothing plane then a jack plane. This isn't as much work yet the same intimate knowledge of the piece of wood and what it has to tell you about itself...
Good luck and would love to see pictures of your work!!!