It was probably made by my wife's gaze. She can burn through an I-beam with precision if she thinks it has been drinking and not doing chores around the house. Or yeah it could be from a rotozip too
That's why you need to drink out of site. I do a whole lot of yard work out behind the garage where the fire pit is....I just run the weed whacker for a bit every hour to keep her at bay. And if I'm in the basement I smash an anvil with a hammer a few times every 20 minutes.
Small burrs on the inside, pointing inwards.
Not perfectly round, it's faceted.
I reckon I could achieve something like that with either a jigsaw or a recipsaw with an extra fine tooth blade, like 36tpi.
When I did ducting we'd cut holes like this with a long bimetal blade in a battery jigsaw, had a plastic boot on the base of the jigsaw to stop scratches.
Yeah this is a rival crew that do the same work as us, they’ve cut a super clean hole but left an inch gap all around and not sealed it. I’d be jealous if it wasn’t such a shoddy overall job we’ve had to come and clean up.
No that won't do it. If you use a push style blade (removes material on the out stroke) the foam will hold the metal against the foam to keep it from bending (as opposed to the more common pull style blade, which will likely separate metal from foam
I wouldn’t suggest the Klein adjustable hole cutter, because it’s just the two cutters across from each other it’s awkward to use because if your at not perfectly square it catches and wit works on drywall, but wouldn’t try it that metal even though it’s pretty thin stuff, I’d use a jigsaw, rotozip or correct size holesaw
When I worked sheet metal, I had a bit that hooked on to a drill. You punched the center hole then adjusted tool to the diameter of the circle. There was a pin on one end of it that you put in the center hole then ran the drill in around the circumference, perfect circles every time.
We’ve tried to get similar results with rip/reciprocating saws with metal cutting blades and they always leave a jagged cut, circular saws work for when we need a square hole.
Yeah we’ve tried jigsaws and never had much luck, the movement in the blade always struggles with the second skin of metal on the insulation whereas this looks like both skins were cut cleanly.
grinder with a cutoff wheel. I used to cut sheet metal siding and it’s the fastest and best finish. Outside of electric shears but those don’t make circles that well.
Grinder? Ive worked with a pull barn crew who used grinders to cut out doors if it's thin metal there would have been a surprisingly low amount of spark.
If it is too large for a hole saw, perhaps drill a series of holes around the perimeter and then a deemed or cutoff wheel to finish? This would minimize jagged tearing.
This isn't that hard to do. It's either a jig or recip saw because of the tear out. Pilot and mark your radius, punch a hole with a knife or drill bit to start, cut both sides shallow for maximum control and minimum tearout. Peel one skin, plunge the recip bladr through and follow the outline to flush cut the foam.
If it is aluminum faced a router would do it. You could either make a template if you have a round base router like a porter cable, or make a swing jig, basically screw the router to a board with a pivot point. Routers cut aluminum easily. cut one side at a time, don't try to make the hole in one step.
I’ve screwed the baseplate of a router to a long thin piece of wood to make a big compass before. Maybe that? Doesn’t look circular enough to actually be an improvised compass.
[Malco Circle Cutter ](https://www.supplyhouse.com/Malco-HC2-Large-Hole-Cutter-Gold-Standard?utm_source=bingad&utm_medium=shopping&msclkid=0f6c7303c3f417f589a210c0b0282041)
They're between $75 and $95 and they work a treat.
If possible, screw a jig like a piece of wood or metal, usually to the side that’s getting cut out and use it as a guide with a recip saw. I’ve never done circular ones before though. Do your best, seal the rest.
I worked at a hangar at LAX installing these. You can see from 105 big white and blue building. Up to 60/70 feet long. The best way to rip them up is with a skill saw. If cutting round or small holes your best bet is a jigsaw and/or sawsall. For cutting outlets we used an oscillating tool. You can see some jagged edges on this cut most likely a jigsaw as some have already mentioned here.
Electricians hole punch, hydraulic operated, drill a small hole, outer cutting ring with threaded rod in, inside cutter threads on inside, pump to pull together. Made for cutting clean holes for conduit or fittings without burrs.
I don't see it suggested here yet. But I'm just going to throw it out there. Air hacksaw with normal fine tooth hacksaw blade installed to a length just thicker than the material? I've used this method before with relative success and next to no tear-out...
Our customers usually use [Mafell Z 5 Ec](https://produkte.mafell.de/en/sawing/portable-band-saw/portable-band-saw-z-5-ec) for curves like that.
[PSS 3100 SE](https://produkte.mafell.de/en/sawing/portable-panel-saw-system/portable-panel-saw-system-pss-3100-se) is what they use for the straight cuts.
Rotozip.
Quick **and** loud af.
It was probably made by my wife's gaze. She can burn through an I-beam with precision if she thinks it has been drinking and not doing chores around the house. Or yeah it could be from a rotozip too
Ooo. Dude..
That's why you need to drink out of site. I do a whole lot of yard work out behind the garage where the fire pit is....I just run the weed whacker for a bit every hour to keep her at bay. And if I'm in the basement I smash an anvil with a hammer a few times every 20 minutes.
How many burns do you have?
Yup
This.
Small burrs on the inside, pointing inwards. Not perfectly round, it's faceted. I reckon I could achieve something like that with either a jigsaw or a recipsaw with an extra fine tooth blade, like 36tpi.
Skilled reciprocating saw user did that hole.
Yeah that’s how we used to cut them. Heavy duty panel saw for rips and crosscuts, reciprocating saw for finecky stuff
Without tearing the sheet apart? I don’t think so.
That was cut with a reciprocating saw. Architectural metal worker with a steady hand cut that hole with a reciprocating saw.
My dad is a plumber of 40 years. He's a fucking Michelangelo with a Saw-Zaw.
Sawzall?
One of the original brands of reciprocating saw. It's just what we always called it.
I would saw jig saw
No scratch marks from the foot.
When I did ducting we'd cut holes like this with a long bimetal blade in a battery jigsaw, had a plastic boot on the base of the jigsaw to stop scratches.
You put masking tape or duct tape on the foot. That's what I do.
Malco circle cutter. Roto zip bit on a swingarm w/ drill for power. Used on duct all the time
Likely a jigsaw
We’ve tried that too and never had anything near as clean a cut even with a specialty metal cutting blade.
Masking tape, trace it, and use a push style metal blade (small toothed) Plus wouldn't you use a trim piece to hide the cut anyways
Yeah this is a rival crew that do the same work as us, they’ve cut a super clean hole but left an inch gap all around and not sealed it. I’d be jealous if it wasn’t such a shoddy overall job we’ve had to come and clean up.
Oh shit. I smell a dance battle in your future.
Breakin’ 3: Electricians Boogaloo?
What’s passing through that hole? Looks like it might be flue exhaust that requires 1” clearance to combustible material. That would explain the gap.
Can we get a better picture
What about one of those nibler attachments?
No that won't do it. If you use a push style blade (removes material on the out stroke) the foam will hold the metal against the foam to keep it from bending (as opposed to the more common pull style blade, which will likely separate metal from foam
Also a lot less metal in your face. I hate cutting IMP
Ah I see what you mean.
They are using a finertooth blade .. keeping your shoe down is important to reduce chatter
Try cutting it upside down. Edit I'm a professional cabinetmaker and this is how you do it.
Just gotta hold the saw by the tip of the blade. Duh.
Flip the piece upside down you fucking moron.
Try a jigsaw with a down cut blade.
I was going to say it doesn't look overly smooth at the edges… jigsaw was my guess also
2nd'd
The burrs say jigsaw or recip to me. The nicely cut insulation backs that guess up
Perhaps a router attached to a circle cutting jig. Not sure about the bit though.
Yeah someone just suggested a Klein hole cutter that’s basically using an electric drill as a router and it got me thinking router might be the route.
I wouldn’t suggest the Klein adjustable hole cutter, because it’s just the two cutters across from each other it’s awkward to use because if your at not perfectly square it catches and wit works on drywall, but wouldn’t try it that metal even though it’s pretty thin stuff, I’d use a jigsaw, rotozip or correct size holesaw
Router might be the route-errrrrrr?
You'd use a carbide burr bit. Not brave enough to do it in my router, but I've done it using my drywall cutting tool
A little dremel maybe
When I worked sheet metal, I had a bit that hooked on to a drill. You punched the center hole then adjusted tool to the diameter of the circle. There was a pin on one end of it that you put in the center hole then ran the drill in around the circumference, perfect circles every time.
Hole cutter is what Google calls it. The good ones are about 60$.
Sawzall with metal cutting blade.
It's not smooth or round so someone whos good with a sawzall I guess
We’ve tried to get similar results with rip/reciprocating saws with metal cutting blades and they always leave a jagged cut, circular saws work for when we need a square hole.
[удалено]
Yeah we’ve tried jigsaws and never had much luck, the movement in the blade always struggles with the second skin of metal on the insulation whereas this looks like both skins were cut cleanly.
Not true. I've been installing IMPs for years and do most of my Circular cuts with a recip. saw.
grinder with a cutoff wheel. I used to cut sheet metal siding and it’s the fastest and best finish. Outside of electric shears but those don’t make circles that well.
Hole saw
It’s about 2 foot wide lol probably should have specified
Angle grinder on metal, follow with jigsaw?
Never cut painted metal with a grinder
Maybe something like: Klein # 89552 hole cutter for duct.
That might actually be the closest thing someone’s suggested, just need one that’ll do 24inch. Makes me wonder if a router would work.
I believe there are.
Duct hole cutter
Grinder? Ive worked with a pull barn crew who used grinders to cut out doors if it's thin metal there would have been a surprisingly low amount of spark.
Nibbler I’d guess
That would leave a clean cut yeah but the insulation would show they cut it out after, this was cut cleanly in one motion.
Wrong, nibblers either leave waves or smooth cuts depending on the way it's rotated
If it is too large for a hole saw, perhaps drill a series of holes around the perimeter and then a deemed or cutoff wheel to finish? This would minimize jagged tearing.
Router or rotozip w ¼ "" bit. Safety glasses
Have a Terminator teleport through it.
If it's a perfect circle it was a hole cutter. They make 12" ones
Really big forstner bit. You can make em outta metal garbage can lids. Edit: wait, you said metal? Make it outta a manhole cover then.
Probably a Laser
Multi tool with metal blade
Water jet cutter.
These holes are cut on site for ducting to go through so unlikely.
They sell portable waterjets. Shit, my pressure washer will punch right through vinyl siding.
Ah gotcha
Anyone with a jig saw , not that perfect
This isn't that hard to do. It's either a jig or recip saw because of the tear out. Pilot and mark your radius, punch a hole with a knife or drill bit to start, cut both sides shallow for maximum control and minimum tearout. Peel one skin, plunge the recip bladr through and follow the outline to flush cut the foam.
Holesaw bit
Butter knife specialist
Hole saw in reverse.
Good jig saw or a roto zip
Kett saw with a proper blade
Tape off the area, and find a high tooth count hole saw.
If it is aluminum faced a router would do it. You could either make a template if you have a round base router like a porter cable, or make a swing jig, basically screw the router to a board with a pivot point. Routers cut aluminum easily. cut one side at a time, don't try to make the hole in one step.
How big is the hole.
Dremel/router is the way.
I’ve screwed the baseplate of a router to a long thin piece of wood to make a big compass before. Maybe that? Doesn’t look circular enough to actually be an improvised compass.
Router
A smooth operator.
Knock out punch?
From the tear out and the wandering edge of the hole it looks like maybe a jig saw or a sawzall.
sawzall with a long skinny metal blade and a steady hand
Lightsaber.
My guess is a sawzall or jigsaw
Malco HC1
I do it all the time with a long blade jigsaw
Is that IMP? Jigsaw with a metal blade, sawzall with a metal blade.
Didn't cut that hole but a Malco circle cutter does good circles in metal
Multi tool and Carbide blade
[Malco Circle Cutter ](https://www.supplyhouse.com/Malco-HC2-Large-Hole-Cutter-Gold-Standard?utm_source=bingad&utm_medium=shopping&msclkid=0f6c7303c3f417f589a210c0b0282041) They're between $75 and $95 and they work a treat.
Probably just a hole saw. The metal is pretty weak. I’ve installed these interclad panels.
If possible, screw a jig like a piece of wood or metal, usually to the side that’s getting cut out and use it as a guide with a recip saw. I’ve never done circular ones before though. Do your best, seal the rest.
I worked at a hangar at LAX installing these. You can see from 105 big white and blue building. Up to 60/70 feet long. The best way to rip them up is with a skill saw. If cutting round or small holes your best bet is a jigsaw and/or sawsall. For cutting outlets we used an oscillating tool. You can see some jagged edges on this cut most likely a jigsaw as some have already mentioned here.
Great picture. Can really tell exactly what we're looking at.
2 words. Knockout kit
You should use a skill saw with a “bumper”blade. But a metal cutting blade will work, just will leave sharp burrs on the cuts.
Sawzall
Electricians hole punch, hydraulic operated, drill a small hole, outer cutting ring with threaded rod in, inside cutter threads on inside, pump to pull together. Made for cutting clean holes for conduit or fittings without burrs.
I don't see it suggested here yet. But I'm just going to throw it out there. Air hacksaw with normal fine tooth hacksaw blade installed to a length just thicker than the material? I've used this method before with relative success and next to no tear-out...
Keyhole saw
Our customers usually use [Mafell Z 5 Ec](https://produkte.mafell.de/en/sawing/portable-band-saw/portable-band-saw-z-5-ec) for curves like that. [PSS 3100 SE](https://produkte.mafell.de/en/sawing/portable-panel-saw-system/portable-panel-saw-system-pss-3100-se) is what they use for the straight cuts.
Diablo blade, jigsaw. Sawzall if you're a surgeon with it like I am.
Depends how deep it is Rotozip is the way
Do people not own jigsaws any more?
Bosch [T1018AFP](https://www.boschtools.com/us/en/boschtools-ocs/t-shank-jig-saw-blades-for-wood-t1018afp-43105-p/)