[Marco]

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!

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.

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!

 

[Marco]

So I did two passes with a 1/4" spiral downcut on all thirteen circles, with a thin plywood homemade circle gauge I got for a dollar at the local Habitat ReStore, with a cabinet screw in the center of each circle, then went back and finished each one with an upcut bit. I can tell that twenty-six passes of about 50" (16" circles) did dull the bit just a bit, but it is still useable. Combining the two was a great idea! Thank you for giving me this solution! There are two lazy Susans, one has two taller levels for juice bottles and such.
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It came out good... glad you only had to make two passes per circle!