[gdonham1]

That link to the Router Workshop was a blast from the past. After looking at the site it reminded me of the Father and Son team. Cant remember if they are Canadian or just from the northern US. They always had good projects that you could do on a shoestring budget.

So you can make box joints on a trim router but it is not ideal. On cutting box joints you should only make a depth per pass of half the diameter of the bit. So if you have a 1/4 inch bit you should make 1/8 inch passes. That means using your jig over and over to make multiple passes to get the full depth of 15MM. Because 15MM is over half an inch you will need to make 4-5 passes to get the full depth. You can make deeper passes but because you are using a 1-1.25 HP router (trim router) you would be putting a strain on the router with deeper passes. Plus if your rpm drops you will get poor cut quality.

So if all you have is a trim router you can make box joints but it is not ideal. If you have a larger router then I would suggest you use it.

You can weld a trailer hitch on the back of a Volkswagen beetle and hook up a 10,000 pound trailer to it. You wont pull the trailer very far and you wont be able to stop it after getting it where you pull it. The reason is the Volkswagen beetle was not designed and built to carry heavy loads. As a grocery getter it is a very good car but as a trailer hauler it is very poor. So just because you CAN do something does not mean it is a very good idea.