Cutting is typically the first step in any sheet metal job, but it drives everything downstream. The method you pick sets the edge condition, heat input, burr direction, nesting yield, forming behavior, and final assembly fit. No single process works for every print, so we need to match the cut to the part.

Here's a practical rundown of common sheet metal cutting processes and the info we need from you to lock in a repeatable, cost-effective route for your custom parts.

Start With the Full Manufacturing Sequence

Don't evaluate a flat blank in a vacuum. Think about what happens next—bending, welding, fixturing, coating, or mating with another component. A minor tweak to a tab profile, hole location, or grain direction can make downstream ops run smoother, even if the cut time stays the same.

The right blank also accounts for forming allowances. If you send us a finished 3D model of a bent part, we'll review the flat pattern against material behavior and the specific bending tooling we plan to use.

Laser Cutting

Laser cutting gives you maximum flexibility for profiles, holes, slots, and engineering changes. There's no dedicated die per shape, so it's ideal for prototypes and a broad range of production volumes. Nesting software lets us pack parts tightly to boost material utilization.

Material grade, thickness, assist gas, and cutting parameters all affect the edge quality and heat-affected zone. If you have very small holes, narrow webs, or heat-sensitive features, flag them early—don't assume they'll behave like larger geometry.

Shearing

Shearing is the workhorse for straight cuts and rectangular blanks. It's fast, requires minimal programming, and preps stock efficiently, but it won't handle complex contours. Blade clearance and material condition directly impact burr, rollover, and flatness, so we set those carefully.

If a part starts as a simple rectangle and gets features added later, shearing is often more practical than contour-cutting the full perimeter.

Punching and Nibbling

Turret punching uses standard or dedicated tooling to produce holes, louvers, slots, and profiles. It can combine cutting with certain formed features. The process is efficient when the geometry and volume match the available tooling.

Repeated overlapping hits can approximate a contour via nibbling, but the edge may show witness marks. The drawing should clearly separate functional edges from cosmetic surfaces.

Sawing and Mechanical Cutting

Sawing is typically associated with plate, bar, or tube rather than thin sheet, but it works well for heavier flat stock and straight preparation cuts. Mechanical routers or other specialized methods may be worth considering for certain nonferrous materials or laminate structures.

Key Selection Factors

Material and Thickness

Carbon steel, stainless steel, aluminum, copper alloys, and coated sheets respond differently to thermal and mechanical cutting. Specify the full grade, thickness, and supplied condition rather than just calling it “steel” or “aluminum.”

Feature Size and Spacing

Small holes, narrow slots, and short distances from an edge can distort or leave too little material for subsequent bending. Review these features relative to sheet thickness and the chosen process.

Edge and Burr Requirements

Most cutting processes leave some burr, dross, rollover, or heat tint. Define where an edge is exposed, used for sealing, or inserted into another part. A general “burr free” note is less useful than a measurable edge-break or application-specific requirement.

Quantity and Revision Frequency

Tool-free profile cutting supports changes and mixed part families. Dedicated tools become efficient at stable production volumes. Forecast quantity and expected revisions help determine whether flexibility or cycle time should drive the decision.

Designing the Blank for Bending

Keep holes, slots, and notches away from bend deformation zones where possible. If they must be near a bend, the sequence may need to change or relief may be required. Grain direction can affect cracking and springback in some materials, so note cosmetic or directional requirements on the drawing.

Coordinate the flat pattern with the metal bending process rather than locking an unverified blank size too early.

Quotation Checklist

Send us the 3D model plus a dimensioned print.
Specify material grade, thickness, and surface condition.
Flag critical profile, hole, and edge tolerances.
Indicate burr direction and which face is cosmetic.
List any deburring, coating, or protective film requirements.
Give us annual and batch quantities.
Note downstream bending, welding, or assembly steps.

Frequently Asked Questions

Which sheet metal cutting process is cheapest?

It depends on geometry, material, thickness, volume, and what happens downstream. A fast cut can still cost you more if it forces extra deburring or complicates forming.

Should I provide a flat pattern?

A flat pattern helps, but we also need the finished 3D shape and bend specs so we can verify bend allowances and tooling.

Need blanks or finished sheet metal parts? Check out Balford’s sheet cutting service or send your drawing for a quote.

Sheet Metal Cutting Methods for Custom Parts