Summa vinyl cutters utilize two distinct cutting head technologies: Drag (swivel) knife technology and True Tangential knife technology. Choosing the correct blade and holder style depends entirely on your
The Core Technology Difference
Choosing between these two setups impacts how the cutter handles tight corners,
|
Feature |
Drag Knife Technology |
Tangential Knife Technology |
|
How it Works |
The blade spins freely in a bearing and is pulled through the |
An electric motor actively lifts, rotates, and lowers the blade at corners. |
|
Corner Precision |
Uses software emulation; sharp corners may exhibit microscopic rounding. |
Perfect 90° corners and clean cuts on ultra-fine text. |
|
Depth Control |
Controlled purely via variable downward pressure. |
Managed via a mechanical nose piece for depth accuracy to a hair's width. |
|
Best Used For |
Standard vinyl lettering, window graphics, stickers, and thin films. |
Thick laminates, sandblast stencils, window tint, floor graphics, and PPF. |
Summa Drag Knife Blades & Accessories
Drag modules are standard on the Summa S One series and the S Class D-Series. The direction of the blade changes organically based on the movement of the cutting head.
· Summa Standard Drag Knife Blade 36° (Part #391-360):
This is the standard workhorse blade included with most drag cutters.
Best for everyday adhesive sign vinyl up to 0.25mm thick.
· Summa Specialty Drag Knife Blade 60° (Part #391-231):
Designed with a sharper angle to handle slightly thicker, more rigid materials up to 0.60mm.
Fits inside the standard 1.5mm drag blade holder.
· Summa Sandblast Drag Knife Blade 55° (Part #391-358):
Thicker 2.0mm shank specifically built for sandblast stencils and heavy films up to 0.80mm.
Requires the specialized Summa Copper Drag Knife Holder (Part #391-363).
· Summa Standard Drag Knife Blade Holder 1.5mm (Part #9TL89-67033):
The baseline aluminum blade holder for standard 36° and 60° drag blades.
Summa True Tangential Knife Blades
Tangential blades feature a unique flat, keyed shank that locks into place, allowing the automated head motor to control its direction precisely. These are exclusive to Summa T-Series roll cutters (such as the S Class 3 T) and F-Series flatbed modules.
· Summa Standard Tangential Blade 36° (Part #390-534):
The primary blade used for everyday cutting on thin, flexible films, cast vinyl, and banners.
· Summa Dual Wedge Tangential Knife Blade 45° (Part #390-560):
The most versatile general-purpose tangential blade.
Its wedge geometry excels at cleanly cutting standard vinyl as well as medium-thickness reflective films.
· Summa Tangential Double-Tip Knife Blade 36° (Part #390-551):
Features cutting edges on both sides to minimize the distance the cutter needs to lift and turn, optimizing high-intensity reflective cut jobs.
· Summa Tangential Sandblast Blade 60° (Part #390-550):
Heavy-duty blade crafted specifically to puncture thick sandblast resists, magnetic foils, and heavy paint protection films (PPF).
Hybrid Use: Drag Blades on Tangential Cutters
If you own an S Class Tangential machine, you can run affordable drag blades for casual, high-speed production runs. To do this, you must install the Summa Drag Knife Blade Holder for Tangential Heads (Part #395-323) along with a corresponding drag nose piece.
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