Thats what I thought. I was just curious since the the snap-in PS-14-K was discontinued and its such a pain to put in a screw-in button on the bottom right most hole on the TE and SE.
The distance between the guide and edge of the blade on the bit will be the width of your recess and you’ll set the router depth to be the thickness of your plexi. I did this by placing the plexi next to the bit and adjusting as needed, and test routing on a scrap piece of wood to get it just right. After that, the guide does the rest. Since the guide makes everything perfect, I simply place the completed glued and sanded box down on the router table and follow the inside edge. Very important that you do this as the last step right before staining since sanding will diminish the depth of the route and cause your plexi to not set deep enough. The corners round out because the router cannot cut square corners.
TIPS
Make sure that routing this is the 2nd to the LAST step you do before staining and should happen BEFORE you cut place and glue posts.
Test fit with a piece of plexi that is the same thickness you intend to use if you’re going for flush. If it is not deep enough, go deeper, but take care not to go too deep since you wont be able to recover outside of getting thicker plexi.
The thickness of the channel does not matter since it is mostly so the plexi does not cave in when handled, but don’t make it too thin.
This method can be used to make square bottoms too, but that would require you to chisel the rounds out. I’m more confident in sanding down plexi so I did that instead and the result looks much more elegant.
ROUNDED PLEXI
Get a custom cut plexi AFTER you route the recess. Do not get it before since it is difficult to route it to fit an already cut piece of plexi. At least I think it would be so.
Make sure the height and width and depth of the plexi fit before you round the edges
Place the plexi over the bottom and use a wet erase marker to outline the rounded corners. Be careful to leave slack since you can sand down but you can’t recover over rounding
Use your router table to route down the edge according to guides (much faster than sanding)
Use fine grit sand paper to fine tune each edge individually and work each corner independently and completely before moving to the next. Working them all a little simultaneously will not work so well.
souji, I use a table for these operations. It is the safest way. Just keep in mind the rotation of the bit in relation to the wood. You always want to feed against the rotation of the bit.