So, like it says, Im trying to figure out how to cut a perfect 9 inch circle out of my sub box I just made. I have a JL 103w3-4 sub that just showed up, so now I know the mounting hole to cut. How do I make a nice circular hole. I have a hand jigsaw, but I doubt that will make a very good circle... haha

Thanks!

 

Use a drill and drill some holes to get you started

 

Yup, I know that trick, but I dont want to use the jigsaw. I want it to be a perfect circle. I was thinking like using a router on a pivot in the middle or something..

But I dont know how I could do that because towards the end of the cut the center would break away and Id be f-ed. LOL

 

I have used a dremel and jig saw without any problems.

 

ooh, the dremel is an interesting idea. I think I might try that actually!! I used 1/2" particle board, so I would imagine I could find a bit that is at least a half inch long right?

I mean a cutting bit, not a sanding bit

 

Using the jigsaw is really not a big deal. I've built plenty of sub/speaker boxes, and I always use a jigsaw. If you use a compass and draw the circle and get as close as possible, you will be fine. The mounting flange on the driver will cover up any imperfections, and the minor fluctuations aren't likely to affect the effective volume of the box.

 

a router , put the pin in the middle and swing it around and boom perfect circle .

 

I have used a plastic template thingy that fits on a router with a straight cutting blade, anchor the jig in the center of the hole & make your circle.


Or make your own jig:

 

i use a board with 2 screws to mark the circle then jigsaw, comes out damn near perfect everytime

 

I was thinking of using the router anchored to the center, and just spin it around. Trouble is, what do you do when you get close to the starting point? You lose your solid mounting when the inner circle becomes free?

 

I like that! But the same issue, what do you do when the center is no longer anchored cuz you cut all the way around?