Trimming Carbon Fiber — Vlog 03: Why Cutting Cured Carbon Is Harder Than Making It

Why Cutting Carbon Fiber Is a Genuinely Hard Problem

Most people assume the hard part of carbon fiber is making the part. In reality, the layup and cure are well-understood — it's the finishing that separates a good part from a bad one.

Three things make cured carbon fiber difficult to cut:

It's abrasive. Carbon fiber is stiff and hard on tooling. Cutting edges wear quickly, and as they wear, the cut quality drifts.

It's brittle-rigid. Unlike metal, it doesn't deform gracefully. Cut it wrong and you get splintering, delamination at the edge, or a frayed edge that never looks right — no matter how well the part was made.

It's unforgiving of variation. On a visible panel, a trimmed edge has to follow a line. Two panels with slightly different edge trims look like two different products. Precision isn't cosmetic here — it's the product.

And there's a fourth consideration nobody photographs: carbon fiber dust. Trimming and drilling produce fine particulate, and any shop doing this work has to manage it properly.

How the Cuts Actually Get Made

Frank describes the current approach plainly: for the more complex pieces — panels especially — the holes and end trims are cut using a CNC machine, so the result matches the 3D drawing.

That word "drawing" is the important one. It means the cut isn't judged by eye or by hand-feel. It's judged against the CAD model. The standard isn't "looks about right" — it's whether the finished part agrees with the file it was designed from.

Alongside that, some operations are still completed by hand. Frank says so directly, and it's worth being honest about: hand work is not a shortcut, it's a complement. There are shapes, radii and tight details where a skilled operator's hands still do the job better than a jig.

The combination — CNC for repeatable geometry, hand work for the difficult details — is where the shop is today.

The Honest Part: This Factory Is Young

Here's what most brands would leave out of a video.

Frank admits the factory is new, and that cutting technology is still something the team is working through — particularly on complex panels. That's not a marketing weakness. It's an accurate description of a young carbon fiber operation that is actively building its capability.

The reason it's worth telling customers is the same reason it's worth reading: if you're buying carbon fiber, you should know where the hard parts are in the process. A supplier who claims every step is already effortless is either not paying attention or not telling the truth.

What's Coming Next

The plan Frank outlines is concrete: add additional multi-axis CNC capacity in this factory, positioned to handle carbon fiber panel cutting, so the trimming work can be done to a consistently higher standard.

It's the right investment, and it's the same logic as the autoclave from Vlog 02. Carbon fiber quality is decided by equipment and process control — not by good intentions. When you buy a part made in a shop that keeps adding capability, you're buying the output of that investment.

What This Means If You're Ordering Carbon Fiber Parts

Ask any carbon fiber supplier three questions:

1. How are the holes and edges cut — CNC, waterjet, or by hand?
2. Is the cut verified against the CAD model?
3. What happens on a complex panel where the geometry isn't simple?

The answers tell you whether you're buying a repeatable part or a one-off that looked good in a photo.

We'll answer all three honestly — including the parts we're still improving.

Fitment & Custom Work

We build carbon fiber panels, air intake pipes and custom carbon fiber components from prepreg, autoclave cured. Complex geometry and vehicle-specific fitment are our normal work. Send us your drawing or reference part, and we'll tell you what's possible and what it costs.

Prepreg laid up by hand. Cut to the drawing. Trimmed to fit.