Architectural Flashing Supply
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Shearing, slitting, notching and cutting · Lesson 3 of 4

Shearing, slitting, notching and cutting: methods and worked application

From an order to a cut blank: the set-up sequence, worked clearance, twist, blank and piece-count examples, slitting set-up, notching and hand cutting.

You will be able to: Plan blanks and pieces from a profile, set up and prove a shear, slitter or notch by a documented method, and record the inputs, units and checks.

11 min · 12 slides · 8 questions

All lessons in this module
Slide 1 of 12

From order to cut piece

The flow from an order to a blank ready to form:

  • Check girth and length against AFS's limits
  • Plan blanks across the sheet and pieces for the run
  • Set the machine to its manual; lock out for blade work
  • Cut a test strip and read the edge
  • Cut the blanks, then notch, relief holes first
  • Clean off swarf, inspect, send to the folder
From order to cut blankEight numbered steps from the order to the folder, with a stainless check that adds cleaning the machine and keeping the film on, and an edge check that loops back to lock out, adjust the blades and re-test.12345678Order and FlashDraft profileCheck girth and length limitsPlan blanks and piecesSet machine; lock out bladesCut a test strip, read edgeCut the blanksNotch, relief holes firstClean, inspect, to folderStainless?Edge OK?Clean themachine;keep film onLock out,adjust blades,re-testnoyesyesno

A flow of eight numbered steps from the order to the folder, with two decision diamonds: edge OK, with a no path back to lock out, adjust the blades and re-test; and stainless, with a yes path to clean the machine and keep the film on.

1
Order and FlashDraft profile: girth, length, material, painted side
2
Check the limits: girth up to 48 in, length up to 126 in
3
Plan blanks across the sheet and pieces for the run
4
Set and verify the machine to its manual; lock out for blade work
5
Cut a test strip and read the edge
6
Cut the blanks
7
Notch where the profile needs it, relief holes first
8
Clean off swarf and burr, inspect, send to the folder
The sequence taught in this lesson. AFS forms on its Thalmann folder; the cutting machines shown are generic.

Sources

Videos for this lesson

What this video shows: A sheet metal trainer uses a slitting machine to cut coil and flat stock to width.

Video: How to use a sheet metal slitting machine by Metal Roofing Trainer - Alex Prothmann, on YouTube. Chosen from the video's published description.

What this video shows: Malco's N1R and N2R hand notchers making V notches in sheet metal.

Video: Malco N1R & N2R Hand Notchers Video by The Malco Group, on YouTube. Chosen from the video's published description.

What this video shows: A panel maker notches and folds snap-lock standing seam panel ends at the eave to hook a cleat or drip edge (that panel type only).

Video: How To Bend Standing Seam Metal Roofing Panels. Notching & Folding At Eave Ends - Step By Step Video by Metal Roofing Learning Channel®, on YouTube. Chosen from the video's published description.

What this video shows: A metal-shaping instructor demonstrates aircraft snips making clean cuts without distorting the metal, and common misuse.

Video: Covell's Tips for Snips by Ron Covell, on YouTube. Chosen from the video's published description.

Glossary

Relief hole
A hole punched at the corner of a notch so the metal does not tear there when the flange is formed.
Horizontal clearance
On a slitter, the side-to-side gap between the upper and lower knives.
Vertical overlap
On a slitter, how far the upper and lower knives overlap.
Bend zone
The part of the blank between the mold lines of a bend, which stretches and moves as the bend forms.
Splice lap
The length one piece overlaps the next in a run; it can add a piece to the count.