PROCESS SELECTION GUIDE
Channel Letter Notching, Flanging & Slotting Guide
Define the return design and required automatic operations before comparing machines. Similar-looking letters can require different material preparation and tooling.
BUYER DECISION SUMMARY
Notching, Flanging, Folding, or Slotting: Which One Do You Need?
These operations change different parts of the return and therefore point to different machine mechanisms. Tooth notching removes controlled sections so a wide flat-aluminum return can follow corners. Flanging or edge folding forms an edge before the return is bent. Slotting prepares a bend location, while punching creates a different feature and must not be treated as the same process. A machine should be shortlisted only when every required automatic operation is documented for the chosen material series. The definitions and linked product pages provide a practical starting comparison; they do not establish tooling geometry or final process approval. Before purchase, specify the return design, material and thickness, dimensions, smallest radius, production file, which operations must be automatic, tooling and utilities, included equipment, and the observable result that will be used for acceptance. The Channel Letter Bender Price Comparison lists documented limits for all 11 models.
PROCESS DEFINITIONS
What Each Operation Changes
Use these definitions to describe the production job. The quotation still confirms material, dimensions, tooling, machine configuration, and acceptance method.
Tooth Notching
Tooth notching removes controlled sections so a wide flat-aluminum return can follow corners and curves. NF220 is the focused automatic machine. See Notched and Folded Channel Letter Returns.
Flanging or Edge Folding
Flanging forms an edge before bending. Confirm edge geometry, material thickness, side height, and whether this operation must be automatic.
Slotting
Slotting is documented on MM160 / MM200, FM130 / FM220, AP130, RF130, and TR1 / TR2. A published slotting angle of 45°–135° is documented only for AP130 and RF130.
Automatic Punching
Automatic punching is documented for the FM series. Define the feature, material, thickness, and position before configuration review.
Profile and Frame Forming
Profile forming depends on cross-section, wall thickness, side height, required arc, and one- or two-direction forming. See Sign Frame and Lightbox Profile Bending.
Trimless (Rimless) Returns
Trimless letters use a compact flat-aluminum series. Compare TR1 and TR2 and submit the return design for confirmation. See Compact Rimless Channel Letters.
PROCESS FAQ
Name the Operation Before You Pick a Model
Are notching and slotting the same process?
No. They describe different material-preparation actions. Use the return construction and production file to confirm the required operation and tooling.
Does every machine include automatic edge folding?
No. Automatic edge folding is specialized. NF220 is the focused machine documented for automatic tooth notching and edge folding.
What should I send for profile or frame work?
Profile and frame work starts at PF60 and PF80. See PF60 / PF80.
Turn Required Operations into a Machine Shortlist
Send the return style, material, working dimensions, smallest radius, required automatic operations, and a representative DXF.