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Need to cut perfect circles "Subwoofer box"

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Forum topic by chetrog posted 08-18-2014 04:52 AM 1000 views 0 times favorited 15 replies Add to Favorites Watch
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chetrog

71 posts in 219 days


08-18-2014 04:52 AM

I am going to be building a subwoofer box, and I want to make it a little fancier then the way i usually do it. I usually just use a compass and use a jig saw. That always works, but this time I want to add another piece of wood that would make the box flush. Here is a picture online that im talking about.

I don’t have a router. Thanks for your time.

-- I had a stroke a few years back, and sometimes the words dont come out as well as I would like.


15 replies so far

View TheFridge's profile

TheFridge

1037 posts in 241 days


#1 posted 08-18-2014 04:57 AM

Id still use a jigsaw but cut it really slow. There are to many other options unless you want to buy a tool or 3.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View Redoak49's profile

Redoak49

485 posts in 743 days


#2 posted 08-18-2014 12:16 PM

I would use a router and circle jig. Or you could make a template to use with the router and template bit.

View mpounders's profile

mpounders

750 posts in 1650 days


#3 posted 08-18-2014 01:38 PM

Are you asking about how to make the rabbet around the inside of the circle? Cut the outside circle, and then cut the inner circle out of another piece of wood and attach it to the back of the first. That appears to be how the one in the picture is made, explaining all the clamps. You could do that with just the jigsaw. I believe you could also attach some type of trammel to your jig saw and use it to cut circle, after getting it plunged thru the wood. But a router would let you cut it out of a single piece of wood.

-- Mike P., Arkansas, http://mikepounders.weebly.com

View bigblockyeti's profile

bigblockyeti

1813 posts in 475 days


#4 posted 08-18-2014 01:41 PM

Router and circle cutting jig would be your best bet. If you’re cutting MDF, a carbide cutting edge is a must.

View Rick  Dennington's profile

Rick Dennington

3614 posts in 1949 days


#5 posted 08-18-2014 01:54 PM

He said he didn’t have a router, so I think that possibility is out…....unless he has to buy one, then yes, it’s the way to go, along with a jig and straight bit , or I’d use a spiral upcut bit….....

-- " I started with nothing, and I've still got most of it left".......

View Tony1212's profile

Tony1212

36 posts in 489 days


#6 posted 08-18-2014 02:59 PM

Is it possible to build a trammel with a jig saw instead of a router? That way you just pin it to the center and it should guide you in a perfect circle.

You may run into issues supporting the cut once you get past the half way point or so.

-- Tony, SW Chicago Suburbs

View Greg..the Cajun Wood Artist's profile

Greg..the Cajun Wood Artist

5283 posts in 2063 days


#7 posted 08-18-2014 03:03 PM

If your jig saw has a place to attach a narrow flat metal bar that can be tightened down you can easily do it with a hole drilled for a pivot point for the circle at the other end of the flat bar. My Makita jig saw has this feature and I have done it this way several times.

-- Each step of every Wood Art project I design and build is considered my masterpieceā€¦ because I want the finished product to reflect the quality and creativeness of my work

View timbertailor's profile

timbertailor

1100 posts in 179 days


#8 posted 08-18-2014 03:14 PM

Sounds like a perfect excuse to buy a router. They are invaluable and could pay for itself, should you decide to build some more boxes for your friends.

-- Brad, Texas, https://www.youtube.com/user/tonkatoytruck/feed

View BinghamtonEd's profile

BinghamtonEd

1593 posts in 1124 days


#9 posted 08-18-2014 03:46 PM

I’d make friends with someone that owned a router.

You could probably pick up a router, make a second box, sell it, and break even.

-- - The mightiest oak in the forest is just a little nut that held its ground.

View wiwildcat's profile

wiwildcat

53 posts in 717 days


#10 posted 08-18-2014 08:20 PM

Not sure this would give you the results you want, I have seen table mounted jigsaw. Basically a top (plywood for example) with a jigsaw mounted under it with only blade sticking through. Like a Poor man’s bandsaw or scrollsaw. Then with a centering pin or nail installed a set distance from the blade you have a jigsaw circle jig.

Found a video on it

-- Wisconsin Wildcat

View SCOTSMAN's profile

SCOTSMAN

5594 posts in 2340 days


#11 posted 08-18-2014 08:31 PM

Get a big lathe, with an invertor, and then get someone who understands the dangers to do it for you it is possible however not really practical.LOL.
Seriously could you not use the bandsaw with a circle cutting jig and then do the internal cuts the same way using a few thinner pieces then laminate them with the through cuts opposite each other .The modern glue is very good these days and it would definitely be strong enough IMHO good luck. Alistair

-- excuse my typing as I have a form of parkinsons disease

View chetrog's profile

chetrog

71 posts in 219 days


#12 posted 08-19-2014 03:27 AM



If your jig saw has a place to attach a narrow flat metal bar that can be tightened down you can easily do it with a hole drilled for a pivot point for the circle at the other end of the flat bar. My Makita jig saw has this feature and I have done it this way several times.

- Cajun Box Sculptor


My jig saw does have the place to put that bar. I have tons of scrap t1-11 scrap. I will try and see how that works tomorrow. If not I will have to save some money up and buy a router. Thanks for the suggestions everyone.

-- I had a stroke a few years back, and sometimes the words dont come out as well as I would like.

View TheFridge's profile

TheFridge

1037 posts in 241 days


#13 posted 08-19-2014 03:33 AM

Prob your best and cheapest bet.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View chetrog's profile

chetrog

71 posts in 219 days


#14 posted 08-20-2014 12:29 AM

Tried the jigsaw and I think im just to clumsy . Looks like i will have to save for a few months for a router and table. I have needed a router and table so just now i have a reason to buy one.

-- I had a stroke a few years back, and sometimes the words dont come out as well as I would like.

View BinghamtonEd's profile

BinghamtonEd

1593 posts in 1124 days


#15 posted 08-20-2014 12:42 AM

You don’t need a table for this, buy a router and then get a table later if you need one. You could accomplish this with either a trim router or a full sized router. What other types of projects you do can influence your decision, or so can budget. I picked up a new bosch colt off CL for $50. New, bosch, DeWalt, etc run 100+ For a trim router.

-- - The mightiest oak in the forest is just a little nut that held its ground.

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