Not every carcass needs a square. Most go together the same way: tacked with a brad nailer or crown stapler, pulled square against a back panel or a pair of stringers, then locked in with countersunk screws. The box squares itself, and nobody reaches for anything.
Then there is the big one, built alone. The sides are tall, the panels are heavy, and there are more corners than hands. The back isn't on yet, so nothing is holding the box square while you get the first fasteners in. That is when a clamping square earns its place, if it was ever going to.
Most don't. They come out for that one box, then go back on the shelf until the next one.
The one-job tool
Every shop has a drawer of tools that do exactly one thing. A few earn the space. The rest sit there, and the reason is rarely that they do the job badly. It is that the job comes around too seldom to justify the setup.
Clamping squares tend to land in that drawer. Plenty need a tool to assemble. Plenty rely on threaded L-brackets that have to be fiddled into position before they'll hold anything, or on a particular clamp you have to go looking for. By the time one is set up you could have braced the corner with a scrap of plywood, so the square stays in the drawer, and the next time a big carcass calls for it you've forgotten how it goes together.
A square that only squares has to be very good at it to stay out of that drawer. A fiddly one never leaves it.
What a clamping square has to do
When you are working alone and a carcass needs one, a clamping square has four jobs. It has to go together without tools. It has to work with the clamps already within reach. It has to be accurate enough to trust. And when the box is square, it has to do something else, or it goes back in the drawer.
That list is the brief Cardo Square was built to.
No tools to set up. The aluminum angles attach with Corso Tack dogs, no tools required. Set the angles, tack them on, and the square is ready.
The clamps you already own. Each angle takes any standard quick clamp. There is no proprietary clamp to buy and no hunting for the one that fits.
A face worth trusting. Each Cardo Square body is an L with a milled 90-degree inner corner and flat milled faces. A flat face spreads clamping load where a round dog concentrates it, so it holds a corner without marking it. The angles run natural aluminum against the orange chassis, so the working surface and the frame read apart at a glance. They are field replaceable if a glue-up gets the better of one.
Two of them. The kit carries two Cardo Square bodies, so a carcass gets two corners held at once, which is usually the difference between doing it alone and waiting for help.
After the glue-up
This is the part that keeps it out of the drawer.
When the assembly is done, lay Cardo Square flat on the bench, or register it to your 20 mm dog grid with the Corso Slot dogs, and it becomes a datum. It is a square stop to press work against for Domino joinery, for planing, or for any setup that wants a fixed 90-degree face to work from. The tool you used to hold a carcass on Tuesday is the stop you plane against on Wednesday.
We'll be honest: this isn't a machinist square. The faces are milled, not ground, and our collective OCD is still having a hard time squaring that. For holding a carcass and giving you a face to work from, it is more than accurate enough. Some nights we still lie awake over the last few thousandths.
Deploy, work, put it back
A tool that is quick to set up also has to be quick to put away, or it ends up on the bench under everything else.
Cardo Square was designed around the Systainer³ S 76 from the start. The whole kit (two bodies, the angles, the Tack dogs and the Corso Slot dogs) lives in one FORG3D Edition S 76 with a fitted insert. It comes off the shelf and opens on the bench, and when the box is square it all goes back in the same spots. For anyone who works out of a truck, the same case goes out the door with the rest of the stack.
Cardo 320 and 640: the same argument, laid straight
Cardo 320 and 640 grew out of the first Cardo Square sketches, and they answer the same question for a different job. The numbers are their length in millimetres. Each is a straight bar with a flat milled reference face, and each one is built not to end up in the drawer.
A reference where the work needs it
The dog holes on an MFT-style top put a reference only where the grid allows. Cardo's slot takes that limit away.
The slot is a row of 20 mm holes joined by a narrower channel, the same slot that runs, abbreviated, along Cardo Square. Learn it once and it works across the family. One Corso dog uses it two ways, depending on how you hold the dog when it goes in.
Through a hole. The Corso 16X drops through the bar into the bench hole underneath. Twist the knob, the O-rings expand, and the bar is anchored to the bench. The holes along the bar sit on 32 mm centers, so the bar's position steps in 32 mm increments. Break the setup down, put it back on the same holes, and the face returns to where it was without you writing anything down.
A quarter turn. Rotate the dog and its T-profile lines up with the channel between the holes. Now it behaves like a T-nut: slide it anywhere along the bar, twist the knob, and it locks there. With the Corso Slot Grip and Slot Glide, the bar positions and rotates anywhere across the top, so you can lock a reference face at whatever angle the work needs.
The quarter turn changes what you are referenced to. Through the hole, the bench holds the position. In the channel, the bar does. Same dog, same slot, same knob.
System 32 without the jig that collects dust
If you build cabinets with European hardware, you already know the number: 37 mm from the panel edge to the first hole, with every hole after it on 32 mm centers. Shelf pins, drawer slides, hinge plates. Get 37 wrong and the whole column is wrong, and you find out at assembly.
A dedicated System 32 jig solves that, and then spends the months between cabinet builds in a drawer. It's the one-job tool again.
The Cardo bars carry the number by arithmetic rather than adjustment. The bar is already dimensioned for it: 32 mm from its end to the center of the first hole, and, because the bar is 38 mm wide, 19 mm from its side to the hole centerline. The blocks make up the rest.
Block 5 mounts at the end of the bar and adds 5 mm, and 32 plus 5 is 37. Push it against the end of the panel and the first hole lands where the hardware wants it. That's the horizontal setup.
Block 18 mounts along the face and adds 18 mm, and 19 plus 18 is 37. Run the bar down the length of the panel with the blocks against the long edge, and the centerline sits where the hardware wants it. That's the vertical setup. The kit carries two, because one block against an edge is a pivot and two make a line, and the line keeps the bar from cocking as you push it home.
Each block is named for the offset it adds, the same way a Corso dog is named for its height. Nothing gets dialed in, so nothing drifts and nothing can be set wrong. You are stacking two fixed dimensions that add up to 37 mm. Add the Corso Bore and the same bar drills shelf-pin and drawer-slide holes in either orientation. The common mounting positions for concealed slides like Blum MOVENTO and Salice Progressa sit on that same grid, starting at 37 mm, so the bar that drills your shelf-pin column drills the slide holes too.
The holes along the top face take FS Rail Magnus and Manus pods, so the bar can hold itself down with vacuum hardware that may already be in your shop, without a clamp hanging off the edge of the work.
Who it's for
For the shop that wants into System 32 but can't justify a dedicated drilling system, the bar is a way in that keeps earning its place between cabinet builds as a reference face and a stop. For the professional already running Festool LR 32, it works alongside that system rather than replacing it, and it handles the field adjustments a full rail setup is too much for. For the mobile professional, one bar goes from reference surface to drilling guide on site without another case of kit.
The 320 and 640 kits each include the Janus driver.
Corso, underneath all of it
Corso is the dog family underneath, built to the spec the Cardo pieces depend on and just as useful as everyday bench dogs. Corso 11 and 16X set a stop just below the face of 12 mm and 18 to 19 mm stock. Corso V cradles round stock from a quarter-inch dowel to one-inch conduit. They're 6061 aluminum, anodized FORG3D orange, and sold in pairs.
Together they make up our SYS-DTM Datum products: tools that set a position and hold it, so a setup doesn't have to be rebuilt from scratch each time.
The preorder
Cardo and Corso were on the bench in Austin, and that was the point of bringing them. Putting them in the hands of people whose shops run harder than ours was the last round of feedback before production. Between now and December the tolerances get tightened, the kits get finished, and the production run goes in with that weekend in hand.
Preorders are open now. Kits ship the first week of December.
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Cardo Square — FORG3D Edition: $295, with the full kit in a FORG3D Edition S 76
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Cardo 320 / 640 Kit: $155 (320) / $185 (640)
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Corso Bench Dogs: pairs, from $20
Where to start
If the jobs that slow you down are assembly jobs, the big carcass, the drawer box, the frame that has to be held square while it gets fastened, start with Cardo Square. If they are setup jobs, a reference face that has to come back to the same place or a column of holes that has to be drilled the same way twice, start with the 320 or the 640. Either way, start with the one that would have left the drawer this week.
Your Workflow. Without Limits.
FAQ
Does Cardo Square need special clamps?
No. The aluminum angles take any standard quick clamp.
Do I need tools to assemble it?
No. The angles attach with tool-free Corso Tack dogs.
What else does it do besides square a carcass?
Laid flat or registered to a 20 mm dog grid, it becomes a square stop for Domino joinery, planing, or any setup that wants a fixed 90-degree reference face.
When do preorders ship?
The first week of December.