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Old 09-13-2011, 10:41 PM
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Default 10$ homemade circle jig

Bought a $9.99 cutting board from Walmart. All I did was cut the cutting board to the width I wanted. Centered and traced the base-plate on the cut piece. Drilled the mounting screw holes and counter sunk them. Put my up-spiral bit in the router then mounted the new base (cutting board) to the router, made a small cut into the cutting board then measure from the outside edge of the hole to half of what size the cut-out is I'm needing. Keep in mind to keep the line for the measurements centered. I measured from the straight edge to the center of the bit and copied to the opposite end of the board. Then used a laser line to draw the line and mark my spots for 8-12" woofers. (Don't forget to drill out the center of the board for the router bits)

This is near exact for me as I was within a 1/32" of what cut-out I needed on each woofer. All you do is make your center point for the woofer, drill into the center point (not all the way through the wood), then detach the drill from the bit while its still in the wood and slide the new circle jig onto the drill bit. Be sure to use the same size drill bit that was used for the holes drilled on the router plate.


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Old 09-13-2011, 10:46 PM
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I made something similar but with a thin piece of wood. Works pretty good. I had thought of the cutting board idea too but i found a thin piece of wood laying around.
I just make sure to measure to the outside of my bit when I do it. And I check before every cut and double check. So far its worked out pretty well
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Old 09-13-2011, 10:47 PM
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I'm going to do something like this to make the adapters for my front 6.5 speakers.
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Old 09-13-2011, 10:48 PM
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Originally Posted by bigdhenderson View Post
I made something similar but with a thin piece of wood. Works pretty good. I had thought of the cutting board idea too but i found a thin piece of wood laying around.
I just make sure to measure to the outside of my bit when I do it. And I check before every cut and double check. So far its worked out pretty well
Yes sir.. It has worked tremendously well for me and I am quite a perfectionist when it comes to building my personal stuff.
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Old 09-13-2011, 10:53 PM
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I made one out of 3/8'' threaded rod. cuts from 8-21'' for less than 2 bucks
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Old 09-13-2011, 10:54 PM
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I made one out of 3/8'' threaded rod. cuts from 8-21'' for less than 2 bucks
I refuse to use metal for my base plate.
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Old 09-13-2011, 10:55 PM
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Originally Posted by nicholask1993 View Post
I'm going to do something like this to make the adapters for my front 6.5 speakers.
Hopefully your router has a small enough base. My routers base would only allow me to make a 8" cutout
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Old 09-13-2011, 10:59 PM
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I refuse to use metal for my base plate.
Mine had holes from the factory for this purpose. and for a straight edge.
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