How to cut holes for subs

Ok - I built many boxes back in the day but none of them were great and I am trying to do a better job now.

I need to mount my 2 - 10" sub in a double baffle.

Yesterday I cut both pieces of the double baffle out and glued them together.

Now I want to cut the holes for the subs.

I do not have a router or a circle jig.

Is there a easy way to mark the circle out. I thought of using string but it seems hard to get to the right size. I wish I had a wooden ruler but I do not as I thought I could drill a hole on one end and another small hole 1/2 the dimension of the cutout.

So what is an easy DIY of marking a perfect circle for the cutout.

Also did I mess up by gluing the 2 - 3/4" MDF panels together before I cutout the holes?

Thanks!


@pro-rabbit ???

You aren't doing it right. @pro-rabbit There ya go.

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Originally Posted by DoesDad

You aren't doing it right. @pro-rabbit There ya go.

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fail

@pro-rabbit

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Originally Posted by OmegaBunny

@pro-rabbit

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So how do you do that? I cannot figure it out.

Also, yeah gluing the baffles together makes it a good bit more difficult to cut especially with a jig saw. Even if the blade is long enough then there is a good chance that it will bend giving you an angled cut

Should of cut them before you glued. Do you have a router? you can make your own jig or use a scroll saw.

to do a mention do @theperson'sname ;

@>>SQL<< ;

Except your name apparently.

@pro-rabbit ;

Then I go back in and edit out the ; so it looks cleaner

@pro-rabbit ;

---------- Post added at 04:38 PM ---------- Previous post was at 04:38 PM ----------

ok cool, got it now, thanks!

I have always glued them first then cut them but I use the correct blade for the material thickness and go slow, as for marking it out use a thin piece of drop and drill two holes the correct distance apart just like it were a ruler.

@GoobLikesTheD ;

Yea, that is not a good position to be in with both pieces glued together. Obviously since you have limited tools a jig saw is the only method and not really a great one for this situation. 1.5" of material to cut through is a pita though.

http://i813.photobucket.com/albums/z...oon-beaver.jpg

10$ circle homemade jig EASY - Car Stereo Classifieds

i made 1 of these and it works very nicely