Cutting out my circle

[ctl46]

I have a jasper jig and I'm ready to cut the hole for the sub. However, how do I ensure the center point for my dowel pin will be directly in the center of my circle. Normally, I mark an X from edge to edge. The circle isn't in the center of the board. Any tips?

[alvitae]

If you have a speed square or something like it this works.
http://www.mathopenref.com/constcirclecenter2.html

[MisterE]

you already have a circle? i just draw a cross wherever i want it on the board and drill a hole in the center of that?

[Rashaddd]

Put the pin wherever you want it.

[Mr. Slate]

If you have a speed square or something like it this works.
http://www.mathopenref.com/constcirclecenter2.html

Very informative.:)