I cut 2 small table tops (21") out of 3/4 ply and it does take some time to do as you make multiple passes. You will likely need more than 3 passes when using a router.Good morning!
I'm planning my first project with my new Bosch router. I'm making a pair of Lazy Susan shelf units for canned goods. I need to cut 8 15" circles out of some old high grade 3/4" plywood I got at the local Habitat store. I have a 3/8" Freud spiral upcut bit coming soon, and I plan to use it with the Bosch edge guide circle attachment.
I searched this forum, and I did find advice that this is a successive pass proposition, but that's all. As I'm making eight of these, I don't want to be at it all day. I'm thinking three passes per circle, but I'd like to avoid too much split out of the plywood.
I plan to plunge this, but if it's easier, I could use the other base and twist the motor into the cut.
Thoughts? Thank you in advance. Hope your day goes well!
Since you are making 8 of them I would plunge my way through the first one. Then use the first one as a pattern to mark the final seven including the pivot hole. Use a jig saw or band saw and cut an 1/8" outside the traced line. Using the pivot hole attach the jig saw cut circle on top of your pattern. With the 2 firmly attached use a flush trim bit to smooth the top circle. There is a possibility the jig saw can cut through 2 pieces of ply at the same time which would speed up the process.
All of the suggestions are good. Pick one and be safe!