How does Toolpath Tiling work in VCarve Pro & Aspire for cutting projects, including 3D projects, larger than my CNC machine bed?

Overview

Toolpath Tiling lets you machine objects and designs that are many times larger than your CNC machine's cutting area, or larger than the material pieces you have. The design stays full-size in the software, and the toolpaths are split into sections (tiles) that each fit within your machine. You then cut tile by tile, repositioning the material or re-zeroing between each pass, and assemble the final pieces. Toolpath Tiling is available in both VCarve Pro and Aspire.

Real-world example from the software maker's forum: a 39-foot long by 12-foot tall architectural panel project, made from 18 individual panels and cut with the tiling feature.

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The Core Workflow

1. Design at full size: create your entire design as if you had an unlimited machine. Don't think about tiles yet.
2. Calculate toolpaths normally: V-carve, 3D finishing, profile, whatever you need
3. Open the Toolpath Tiling form: click the toolpath tiling button in the Toolpaths pane
4. Configure the tile size and overlap, then click Update Tiles
5. Preview tiles: yellow lines show tile boundaries, light red areas show overlap zones
6. Save tiled toolpaths: each tile saves as a separate file
7. Cut tile by tile, repositioning material between each

Tiles are created from the bottom left of your model.

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The Tiling Modes

Mode 1: Individual Tiles

Splits the design into completely separate pieces in both X and Y. Use when:

• Cutting separate panels that will be assembled from individual pieces of material
• Your machine has a moving-bed style (it can't let material overhang the machinable area)
• Creating large wall murals from individual boards

Settings:

• Tile Width and Height: the size of each piece. Set these to your machine's actual usable cutting area, leaving a small safety margin (for example 23 inches on a 24 inch bed, which is shop advice, not a manual figure).
• Overlap: applied in each direction, how far each tile's toolpaths extend across the seam line. For 3D toolpaths, a common starting point is about 0.5 to 1 inch of overlap, adjusted to your model (shop advice, test it).

Overlap is critical for Individual Tiles: V-carve and other 2.5D toolpaths use the side of the bit to complete their cuts. If the tile edge cuts off exactly at the seam, the V-bit won't reach the corner properly. The overlap distance should typically be at least equal to the radius of your tool bit, for example 1/8" for a 1/4" end mill.

Mode 2: Feed-through in X or Feed-through in Y

Slides a single long strip of material through the machine in stages. Use when:

• Cutting a long sign or panel that won't fit length-wise
• One axis is within machine limits and only one axis needs tiling
• You have a fence or alignment rail set up to slide material straight

Settings:

• Define only one dimension (the Tile Width or Height that matches your feed-through distance)
• The other dimension is assumed to match the equivalent current job dimension
• The overlap is applied only in the feed-through direction. It is less critical here and is typically used as a margin for set-up accuracy

Machine smallest tile first: If unchecked, the tiling space is divided into tiles of the specified size and any remainder goes at the end. If checked, the remainder goes at the beginning.

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Setting Up Physically for Individual Tiles

These steps are typical practice. Adapt them to your machine.

1. Place the first piece on the bed and zero X, Y and Z for Tile 1.
2. Run the Tile 1 files (roughing, then finishing).
3. Place the second piece and re-zero for Tile 2.
4. Repeat for all tiles.

Because tiles overlap, a tile's toolpath can extend slightly past its own origin, so check the preview and place the material accordingly.

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Setting Up Physically for Feed-Through

For long panels feeding through in X:

1. Set up a fence parallel to your X axis. A straight piece of MDF or aluminum extrusion screwed to the spoilboard works well
2. Place support stands outside the machine bed for the overhanging material
3. Clamp the material against the fence so it slides in X but doesn't drift in Y
4. Cut Tile 1
5. Slide the material exactly one tile width (minus overlap) along the fence
6. Re-zero X at the new start position
7. Cut Tile 2
8. Repeat

The fence is everything. Without a reliable straight reference, the tiles will misalign visibly at the seams.

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The Overlap Setting Explained

The light red areas in the tile preview show the overlap zone. This looks alarming because the toolpath extends BEYOND the tile boundary. This is correct and intentional.

Why it extends beyond: 2.5D toolpaths (especially V-carve and profile) need to complete their cuts at the edge using the side of the bit. Without this overhang, you would see an incomplete cut at every tile seam.

Room for the overrun: Because the toolpath extends past the tile edge, leave room for the bit to travel that extra distance without hitting a clamp.

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Visualizing the Tiles

Normal preview issue: All tiles are cut in the same machinable area, so they all sit in a similar position relative to the machining origin. Previewing them all at once shows every tile being cut in the same spot. This looks wrong but is correct.

Fix: In the Tile Toolpaths form, enable Draw toolpaths in original position for visualization. This simulates the tiles as if arranged in their final pattern so you can see what the finished piece will look like. Note that it does not reflect the true offset of each toolpath from your machining origin.

Double-click any tile in the 2D view to make it the active tile. The 3D view then shows only the toolpath moves within that tile. To simulate a single tile, make sure the toolpaths are checked visible in the Toolpath List and pick the tile in the Tile Toolpaths form or the 2D view.

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Saving and Outputting Tiled Toolpaths

1. After tiling setup is complete, go to Save Toolpaths
2. An additional option appears: Output Tiled Toolpaths. It is checked or unchecked to match the Tile Toolpaths check box in the tiling form
3. Each tile is saved as a separate file
4. Run them in order

Naming tip: Check the file names your post-processor produces, because they may not include the tile number for you. Use a clear naming system. Include the tile number and position in the file name. For a 3 x 2 tile grid: Sign_Row1_Col1.gcode, Sign_Row1_Col2.gcode, etc. Job sheets and toolpath notes also help track which file corresponds to which section of the design.

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Alignment Pins Method (From Learn Your CNC Academy)

For maximum tile-to-tile accuracy on independent panels:

1. Drill two dowel holes in your spoilboard at known positions
2. Drill matching holes in the bottom of each material blank
3. Drop blanks onto pins for repeatable positioning
4. No re-zeroing needed between tiles (if all blanks are the same thickness)
5. This is a common production method for tiled panel work

For multi-section assemblies, interlocking puzzle joints or spline joints at the tile seams make the assembly alignment mechanical rather than by eye. For feed-through jobs, you can also add small circles to the design at the tile boundary centerlines and cut them with a drilling toolpath to give alignment holes for dowel pins.

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Common Mistakes

• Designing at machine-bed size instead of full project size (design full size, tile afterward).
• Insufficient overlap on V-carve toolpaths, so seams appear at tile edges.
• Running Tile 2 with Tile 1's zero position, so the toolpath cuts in the wrong location.
• Saving without Output Tiled Toolpaths checked, which saves a single file that ignores the tile split.
• Running tiles out of sequence.
• Forgetting to recalculate toolpaths and re-tile if the model changes after tiling is set up.

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This entry also covers tiling a 3D project (3D Roughing and 3D Finishing toolpaths): calculate those toolpaths on the full model first, then tile them.