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Making holes? Adjustable drywall hole cutter, compass cutter and keyhole saws

Stonefree69

Veg & Flower Station keeper
Veteran
Hey, I came across some hole cutters that can make cutting large diameter holes for lights, fans and vents a lot easier, faster and cleaner.

1) Parts Express hole cutter - adjustable dand ceiling tile hole cutter, 1.5" to 11" diameter (about $59). If you have a drill already, makes the cleanest and quickest holes with little mess (uses a dust shroud).
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2) Hole Pro hole saw models, 1 7/8” up to 17” diameter ($130-180). If you need to cut 3/4” MDF or go through a wall to outside, the more durable Hole Pro models should do the trick. Guess these are the “Hummers” of hole saws and also use a drill, some even call it a portable drill press.
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3) Walboard Tool 08-001/AC31 Drywall Circle Cutter, 1" to 16" diameter (about $12). The Walboard tool is also a hand cutter and more accurate than a keyhole saw. Many models are clumsy and ineffective but many like this one.
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4) Olfa Model CMP-2 Compass Cutter, 3"-12" diameter (about $35). Similar to the Walboard but more expensive. Many like this one too for scoring/cutting drywall.
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5) Milwaukee, Shark or Stanley keyhole or jab drywall saws, any diameter (about $10-15). The keyhole or jab saws are among cheapest ways to go and "cut like butter" and with some skill can make holes pretty accurate, but not perfect. There's tons of videos out there on how to do this right as well as other good brands, many like these brands for ease and durability.
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Now with the circle cutters #3 and 4 above you may have to do both sides of the drywall as you need to break the paper covering on the drywall to make an effective break. Some use these to do recessed ceiling fixtures so it shouldn't be impossible to use just from one side like a wall too. Also I guess you can use them as a compass scribe and guide along with a keyhole saw to make an accurate cut. You can use a hand or hammer to finally punch through as well.

Of course if you have power tools you can use a Dremel, Rotozip, router/Jasper jig, jigsaw/circle guide, etc.. I used to have all those but am left w/a DeWalt drill (bro-in-law has them). Well hope this helps at least some of you members here!
 

Stonefree69

Veg & Flower Station keeper
Veteran
On another note, in finding your studs - you can locate a stud near a wall outlet, just use a flat-tip screwdriver to see what side of the outlet is attached to the wall. Studs are spaced apart 16" OC for load bearing walls and 24" for non-load bearing walls (ceiling) by code (at least for last 30 years). That way you can place vents, etc... nearly anywhere on walls or ceiling. You can double-check w/a nail and hammer to see if it "sticks" in wall stud. You could also get the CH Hanson 03040 Magnetic Stud Finder for about $10, no need to go wild w/money on this. Many rave about this model, it uses no batteries and sticks to the wall upon locating stud to mark w/strong magnets:
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jm420

Active member
Veteran
Whenever using power tools to cut holes I always make a test hole with a hammer to make jure theres no wires , gas lines, water lines.Theres nothing worse than cutting a pipe.
 

supermanlives

Active member
Veteran
having the right tools sure makes it easy. i aint cutting any holes in my pad tho.lath an plaster.well except for the floor in a closet lol. and with a hole over 4 inches .better have a good drill.
 

jm420

Active member
Veteran
Good point ,if you live in an older house like SML you can F**K those kind of walls real easy .There is a trick though.I definately wouldnt recommend it to some one not familiar with the old school plaster and lathe.
 

supermanlives

Active member
Veteran
my house was designed to have open flame gas heaters lol. i got one still working too. gas guy flagged it with a red sticker. i tore it off. so my house is naturally vented. all closets have ventillation already. i wouldnt even consider drilling holes in my walls.
 

grow nerd

Active member
Veteran
I wouldn't bother with those expensive adjustable circle cutting drill bits; they don't look like they can cut much more than drywall.

If you need to cut a round hole for a duct, simply take a circle of that diameter (duct cap, rigid duct, similar diameter item like paint can, etc), place it on the surface where you need the hole, trace it, and cut it out.
 

Stonefree69

Veg & Flower Station keeper
Veteran
Looks more like a shotgun did that!
I wouldn't bother with those expensive adjustable circle cutting drill bits; they don't look like they can cut much more than drywall.
For the 1st one I listed, yes. But the Hole Pro has tungsten carbide blades and can cut through plywood and MDF. Carpenters and pros swear by them. I'll have to agree, kinda expensive for just one time use. Still cheaper than a drill press/circle cutter if you ever need that again.

You can just trace and use a keyhole/jab saw, just make sure to make the hole slightly smaller than you need, you can always file back the drywall for final fit. A lot harder to make a hole that's too big smaller.
 

grow nerd

Active member
Veteran
No disrespect, but you make it sound as if cutting a hole in drywall for ducts to pass through is rocket science.
 

Stonefree69

Veg & Flower Station keeper
Veteran
Best I can come up with is a Rotozip w/blade attachment that can cut steel. Found RotoZip XB-MC1 Metal Cutting XBIT cutting bit for cutting through up to 18-gauge steel and cuts circles from 3-1/2- to 12-inches in diameter @ Amazon. Also to make it nice and accurate: RotoZip CRCT1 Circle Cutting Attachment. Both together a little over $30 if you have a Rotozip and they a very handy tool. Factory reconditioned is about $50.

Rotozip came to mind because I had one and know what it can do, but my bro-in-law carpenter likes it too who manages a lumberyard and I gave it to him as a present sort of. Wow that looks good, maybe I should add that to list @ the end.
 

Arthritis_sucks

The Dude
Veteran
No disrespect, but you make it sound as if cutting a hole in drywall for ducts to pass through is rocket science.

its called the right tool for the right job. for those that like clean cuts an tools that work for you an not against ya these drill bit whole cutters are the ish. i rent an if i cut a hole my arthritis will not let me cut it as straifht as these tools do. Not rocket science just carpentry know how.
 

budderfly

Active member
I wouldn't bother with those expensive adjustable circle cutting drill bits; they don't look like they can cut much more than drywall.

If you need to cut a round hole for a duct, simply take a circle of that diameter (duct cap, rigid duct, similar diameter item like paint can, etc), place it on the surface where you need the hole, trace it, and cut it out.

I just cut a 6" and 8" hole in OSB by tracing the duct parts and cutting them out with a jigsaw.


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I want the holes to be very snug as I'm trying to soundproof the room. The jigsaw was ok but I did screw the first hole up too much and had to recut the board. The jigsaw would not work for drywall however.

Personally I think I'll buy the adjustable Parts Express style tool because it'll make the job quick, easy, and high quality. But it is definitely a very specific (read: limited use) tool. I wouldn't spend $100+ unless I was installing lots of recessed can lighting.

1) Parts Express hole cutter - adjustable dand ceiling tile hole cutter, 1.5" to 11" diameter (about $59). If you have a drill already, makes the cleanest and quickest holes with little mess (uses a dust shroud).
View Image
 

budderfly

Active member
Best I can come up with is a Rotozip w/blade attachment that can cut steel. Found RotoZip XB-MC1 Metal Cutting XBIT cutting bit for cutting through up to 18-gauge steel and cuts circles from 3-1/2- to 12-inches in diameter @ Amazon. Also to make it nice and accurate: RotoZip CRCT1 Circle Cutting Attachment. Both together a little over $30 if you have a Rotozip and they a very handy tool. Factory reconditioned is about $50.

Rotozip came to mind because I had one and know what it can do, but my bro-in-law carpenter likes it too who manages a lumberyard and I gave it to him as a present sort of. Wow that looks good, maybe I should add that to list @ the end.


I didn't think the RotoZip bit cut sheet metal very well. It walked a lot and had a tendency to be notchy, like won't cut, won't cut, won't cut, ok whoooo full speed ahead straight to the left lol, oops won't cut, won't cut... .etc.

And depending on where you're cutting, the circle attachments often won't fit, like trying to cut through the top of an installed rectangular duct.

If you do try the RotoZip you're going to want gloves, goggles (not glasses), non-flammable long sleeves and pants and a hat or something. Throws a ton of hot debris.

Snips work reasonably well and you'll never get a perfect circle but it's not usually as important on sheet metal cause you can tape it up easily.
 
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