welllllll ive started on my fiberglass projects (2 kick panels and a sub box) and just to try it out and make sure i could fiberglass i made a box for a kicker L7 for a buddy (squares are easy to cut...) and it came out nice, so i started on my sub box and its not so easy..... stupid rotozip perfect circle cut accessory doesnt have an exact measurement... just inches and i need 11 1/8 and it keeps being slightly too big or slightly too small and im just not sure if there might be an easier way to cut circles?
Replies (5)
ttocs on 05/9/2005 19:56:00
1.) most places use a jig saw.
2.) better yet is a router and a circle jig.
alanjlamore on 05/9/2005 20:24:10
I know of a way to get the circles drawn realy well.
If you have a square piece of wood about 6.5" or longer, you can drill a small hole near one end, and leave the drill bit in that hole (you'll use this to pivot from).
Then you measure half of the diameter that you need (5.5625 in your case, which I think is 5 and 9/16ths), then drill another hole just big enough for a pencil.
Then you put the end with the drill bit into the middle of where you'll cut out the circle (actually drill it into the wood), then stick the pencil in the other hole and you can draw yourself a perfect circle!
Then just use a large drill bit or hole saw to make a hole big enough in the middle to put a jigsaw blade into and start cutting tward the circle...
ttocs on 05/10/2005 00:06:13
I always took the cardboard piece that held the woofer in the box to draw the circle.
cplkittle on 05/10/2005 03:32:46
There is another way if you don't have the cardboard...
if the sub has a 'beauty ring' or rubber seal around it to conceal the screw holes, you can take that off and place it on the wood without stretching or distorting it and trace your line that way.
gearhead on 05/10/2005 09:03:40
Just drill another hole in the RotoZip Perfect Circle accessory where you need the pivot point to be. I use a piece of aluminum flat bar with holes drilled in it to attach to the base of my Craftsman router, and 5/16" pivot holes drilled to match whatever speaker I'm fitting. I use a 5/16" bolt for the pivot. I make 2 cuts, about 1/2 thickness on the 1st one . Works great and only takes about 1 minute per hole.
Replies (5)
ttocs on 05/9/2005 19:56:00
1.) most places use a jig saw.
2.) better yet is a router and a circle jig.
alanjlamore on 05/9/2005 20:24:10
I know of a way to get the circles drawn realy well.
If you have a square piece of wood about 6.5" or longer, you can drill a small hole near one end, and leave the drill bit in that hole (you'll use this to pivot from).
Then you measure half of the diameter that you need (5.5625 in your case, which I think is 5 and 9/16ths), then drill another hole just big enough for a pencil.
Then you put the end with the drill bit into the middle of where you'll cut out the circle (actually drill it into the wood), then stick the pencil in the other hole and you can draw yourself a perfect circle!
Then just use a large drill bit or hole saw to make a hole big enough in the middle to put a jigsaw blade into and start cutting tward the circle...
ttocs on 05/10/2005 00:06:13
I always took the cardboard piece that held the woofer in the box to draw the circle.
cplkittle on 05/10/2005 03:32:46
There is another way if you don't have the cardboard...
if the sub has a 'beauty ring' or rubber seal around it to conceal the screw holes, you can take that off and place it on the wood without stretching or distorting it and trace your line that way.
gearhead on 05/10/2005 09:03:40
Just drill another hole in the RotoZip Perfect Circle accessory where you need the pivot point to be. I use a piece of aluminum flat bar with holes drilled in it to attach to the base of my Craftsman router, and 5/16" pivot holes drilled to match whatever speaker I'm fitting. I use a 5/16" bolt for the pivot. I make 2 cuts, about 1/2 thickness on the 1st one . Works great and only takes about 1 minute per hole.
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