Views: 0 Author: Site Editor Publish Time: 2026-08-26 Origin: Site
Cutting an aluminum composite panel is usually straightforward.
V-grooving one correctly for folding is where the job becomes more interesting.
Sign makers and panel fabricators use aluminum composite panels for shopfronts, sign trays, fascia panels, exhibition structures, wall features and many other fabricated products. In these applications, the CNC router may do much more than cut the outside shape.
One sheet may need to be:
profile cut → V-grooved → drilled → folded → assembled
That means the quality of the finished panel depends not only on whether the CNC can cut the material, but also on how accurately it controls the groove and how much material remains at the fold line.
For ACP work, a useful rule is:
Cutting separates the panel. V-grooving prepares the panel to become something else.
Aluminum composite panels are commonly referred to as ACP or ACM in different markets.
The material typically consists of:
A thin aluminum skin on the front
A composite core
A thin aluminum skin on the back
This sandwich construction keeps the sheet relatively light while providing a flat, rigid surface that works well for signs and fabricated panels.
You may also hear customers use brand names such as Dibond when referring to this type of material.
For machine selection, however, the important information is not the brand name alone.
What matters is the actual panel construction:
Overall thickness
Aluminum skin thickness
Core type
Surface finish
Whether the panel will be cut, grooved or folded
Different panels that look similar can behave differently during machining.
Most ACP work falls into two main categories.
Profile cutting separates the panel into a finished shape.
Typical products include:
Sign panels
Letters and logos
Display components
Decorative panels
Exhibition parts
Mounting plates
The tool cuts through both aluminum skins and the core.
The main priorities are:
Accurate dimensions
Clean edges
Stable sheet holding
Good chip evacuation
Preventing small parts from moving
V-grooving has a different purpose.
Instead of cutting through the complete sheet, the cutter removes material from one side so the panel can later be folded along the groove.
This process is common for:
Sign trays
Folded fascia panels
Box structures
Returns and edges
Architectural or decorative panel forms
The CNC is therefore not just creating a groove.
It is creating a controlled fold line.
That distinction changes how the job should be programmed.
Imagine an ACP sheet before machining:
Aluminum skin → Core → Aluminum skin
For a foldable V-groove, the cutter removes material from one side while leaving enough material at the bottom of the groove to keep the opposite face intact.
After machining:
V-groove → Thin remaining section → Outer aluminum face
The panel can then bend along this weakened line.
If the groove is too shallow, folding may require too much force and the corner may not close properly.
If the groove is too deep, the remaining face can become too weak or may be damaged during machining or folding.
This is why a V-groove should not be programmed from the total panel thickness alone.
The correct groove depends on the actual construction of the panel and the required fold.
Several variables work together.
Variable | Why It Matters |
|---|---|
Panel thickness | Determines the overall material available for the groove |
Aluminum skin thickness | Affects the remaining fold structure |
Core construction | Changes how the panel machines and folds |
Cutter angle | Influences the groove shape |
Groove depth | Controls how much material remains |
Required fold angle | Determines the final geometry |
Surface direction | Determines which face remains visible after folding |
The required result should be confirmed before the toolpath is created.
A customer asking for a “V-cut” may mean:
A decorative V-shaped groove
A fold-preparation groove
A specific corner geometry
A groove for a 90° return
Those are not automatically the same job.
A typical folded ACP sign-tray workflow may look like this:
The finished tray dimensions are converted into a flat pattern.
The design needs to account for:
Front face
Side returns
Corner details
Fold lines
Mounting features
The flat pattern is what the CNC actually machines.
The ACP sheet needs to remain flat while profile cutting and groove machining are completed.
For larger sheets and repeated panel work, vacuum holding can make loading faster and reduce the number of mechanical clamps around the toolpath.
The CNC follows the programmed fold lines using a suitable grooving tool.
Depth consistency matters here.
If the table, panel or Z-reference varies across the sheet, the amount of material remaining in the groove may also vary.
That can affect the fold later.
After the grooves are prepared, the machine cuts the outside shape and any required corner reliefs, openings or mounting holes.
The order of operations should be planned so the sheet remains stable until the critical machining steps are complete.
The machined panel is removed from the CNC and folded along the prepared grooves.
Depending on the product, the corners may then be:
Joined
Reinforced
Bonded
Riveted
Mechanically fixed
The CNC has finished its part of the job, but the final panel quality still depends on the folding and assembly process.
Profile cutting is forgiving in one sense: once the cutter has gone completely through the material, a small difference in cutting depth may not visibly change the finished shape.
V-grooving is different.
The remaining material at the bottom of the groove affects the way the panel bends.
If groove depth varies across a large sheet, one fold may behave differently from another.
Possible results include:
Uneven corners
More force required during folding
Visible distortion
Damaged outer skin
Inconsistent tray dimensions
This makes several machine factors particularly important:
Flat workholding
Consistent Z positioning
Stable machine movement
Correct tool condition
Accurate groove programming
For repeated tray production, consistency can matter more than simply machining faster.
ACP combines aluminum skins with a softer core, so the cutter needs to deal with more than one material in the same pass.
For general profile cutting, suitable carbide routing tools are commonly used.
Tool selection should consider:
Panel thickness
Aluminum skin thickness
Required edge quality
Part geometry
Chip evacuation
Machine spindle
Cutting speed
For small details, a smaller cutter may reach tighter internal features.
For larger profiles, a more rigid tool may provide better stability.
As with other sheet materials, the smallest possible cutter is not automatically the best cutter.
V-grooving requires a cutter that creates the intended groove geometry.
The tool angle and cutting depth should match the required fold.
For example, a groove intended to prepare a panel for a folded corner should be selected according to:
Desired corner angle
Panel construction
Required remaining material
Visible-face requirement
Do not assume that every ACP panel should use the same V-groove depth.
Even when two sheets have the same overall thickness, different aluminum skins or core constructions can change the result.
For new panel types, sample testing is the safer approach.
For profile cutting, looking at the machined edge usually tells you a lot about the result.
For V-grooving, the real test happens after machining.
Fold the sample.
A short test piece can show whether:
The groove closes correctly
The corner reaches the required angle
The outside face remains intact
The fold is clean
Too much force is required
The panel shows visible distortion
This is more useful than judging the groove only while the panel is still flat.
For a new ACP supplier or panel construction, a small groove-and-fold test should be part of process setup.
ACP machining produces a combination of aluminum chips and core material.
Good chip removal helps prevent loose material from remaining around the cutter or being dragged across the panel surface.
Surface protection also matters.
Many sign-grade panels arrive with protective film on the visible face.
Where practical, leaving the protective layer in place during machining and handling can help reduce scratches before final assembly.
The table should also be kept clean.
Small aluminum chips trapped beneath a sheet can mark a finished surface even when the machining itself is correct.
Large ACP sheets need consistent support.
If the panel moves during profile cutting, dimensions can change.
If the panel is not flat during V-grooving, groove depth can change.
For full-sheet work, vacuum holding is often useful because it:
Keeps the panel flat
Reduces clamp interference
Speeds up sheet loading
Supports repeated panel jobs
For smaller or irregular pieces, T-slot clamps or additional fixtures may still be useful.
The main goal is simple:
The panel should stay in the same position and at a consistent height throughout the critical machining operations.
Possible reasons include:
Groove too shallow
Cutter angle does not match the required fold
Incorrect flat-pattern geometry
Panel construction differs from the test material
Check the groove geometry before simply forcing the panel into position.
Possible reasons include:
Groove too deep
Too little material left at the fold
Panel construction not suitable for the programmed groove
Excessive folding force
A sample groove-and-fold test is especially useful here.
Check:
Table flatness
Material flatness
Workholding
Z-reference
Tool condition
This is a process-consistency issue, not just a cutter issue.
Check:
Tool sharpness
Cutter geometry
Feed and spindle relationship
Sheet movement
Chip evacuation
Change one factor at a time so the actual cause remains clear.
Check:
Chips underneath the sheet
Table cleanliness
Material handling
Protective film condition
A perfect toolpath cannot compensate for poor material handling after machining.
Consider a shop making a folded shopfront sign tray.
The flat sheet may require:
Outer profile cutting
Corner reliefs
Four fold lines
Mounting holes
V-grooving
Removal from the table
Folding
Corner joining and assembly
The CNC router can combine several of these machining steps in one setup.
For a workshop producing trays repeatedly, the value is not just cutting speed.
It is the ability to reproduce the same geometry from one panel to the next.
For shops mainly working with rigid panels, SESAME S2 is a practical direction for:
ACP profile cutting
V-grooving
Drilling
Sign trays
Fascia panels
Acrylic and PVC work in the same workshop
It is well suited to businesses that mainly need straightforward routing and panel fabrication without a large number of automated processes.
The working area should be selected around the full sheets used regularly—not only the final sign dimensions.
ACP is often only one material in a professional advertising workshop.
The same business may also process:
Acrylic
PVC foam board
Printed graphics
Foam
Flexible display materials
When the workflow regularly includes automatic tool changes, printed contour cutting or knife-cut materials, ZPRO provides a broader production platform.
Depending on configuration, it can combine:
ATC
CCD vision positioning
Oscillating knife cutting
Optional creasing
Vacuum workholding
For a shop that only cuts and V-grooves ACP, these additional functions may not be necessary.
For a shop switching between several sign-production processes every day, they can reduce the number of separate workflows.
ACP quotations become much easier when the supplier knows what the finished panel needs to do.
Please prepare:
Information | What to Share |
|---|---|
Panel type | ACP / ACM and brand if known |
Overall thickness | Actual sheet thickness |
Panel construction | Aluminum skin and core details if available |
Maximum sheet size | Length × width |
Main process | Cutting, V-grooving, drilling or mixed |
Finished product | Sign tray, fascia, panel, display part |
Folding required | Yes / No |
Required fold angle | If applicable |
Other materials | Acrylic, PVC, printed materials, foam |
Daily workload | Occasional jobs / regular panels / continuous production |
For V-grooving projects, a drawing or photo of the required folded corner is especially useful.
If the panel construction is unfamiliar, sending a material sample for a groove-and-fold test can help confirm the process before regular production.
Yes. CNC routers are commonly used for profile cutting, drilling and grooving aluminum composite panels for sign and fabrication work.
Tooling and machining conditions should match the actual panel construction and required finish.
Yes.
The CNC can machine a controlled groove from one side of the panel so the remaining section can act as the fold line. Groove depth and tool geometry should be confirmed for the specific panel and required fold.
There is no single depth that should be used for every panel.
The correct depth depends on panel thickness, aluminum skin thickness, core construction, tool geometry and required fold. Test the groove on the actual material before setting a production standard.
The best sequence depends on the part and how it is being held.
Critical grooves are often machined while the sheet still has maximum support, with profile cutting planned so the part remains stable throughout the operation.
Dibond is a branded aluminum composite panel product. ACP or ACM refers to the broader material category.
When choosing machining conditions, use the actual panel specification rather than assuming every aluminum composite panel behaves exactly the same.
Yes. These materials are commonly found in the same sign shop and can be processed on a suitable CNC router with the correct tools and settings for each material.
A mixed-material workflow may influence whether a straightforward routing machine or a more automated sign-production setup makes more sense.
For ACP fabrication, tell us:
Panel thickness and construction
Maximum sheet size
Whether you need cutting, V-grooving or both
Required fold angle
Finished product
Other materials processed in the workshop
Daily production volume
Our engineering team can then help you match the CNC router, workholding and machining configuration to the way your panels are actually fabricated.
