Aluminum Profile Cutting Process in Window Production

Measurement and Planning Before Cutting

Every aluminum window begins on site. The technician measures the opening at several points, because walls are rarely perfectly square or level. The measurements are recorded together with photos, the frame type, the opening direction and the glass build-up.

From these notes the drawing is prepared, showing every profile, its length and the cutting angles. The client approves the drawing before any material is ordered, so mistakes are caught on paper and not in the factory.

Selecting and Preparing the Profiles

Once the drawing is approved, the correct profile series is selected for the window's size, wind load and thermal requirements. The aluminum bars are checked for surface condition, color and straightness before they go to the saw.

• Confirm the profile series and color code against the order
• Check that stock lengths cover all cuts with minimal waste
• Mark reference faces so the same side is used consistently

Precision Cutting of Aluminum Profiles

Cutting is done on a precision mitre saw with a blade suited to aluminum. Frame members are cut to length and to the correct mitre angle, usually 45 degrees for corners. Stops and measuring gauges keep repeat cuts identical, which matters when several windows share the same dimensions.

After every cut the length is verified against the drawing. Burrs are removed, because even a small burr can prevent a corner from closing tightly during assembly.

Profile Machining: Drainage, Slots and Hardware Cavities

Beyond straight cutting, the profiles are machined to receive hardware and to manage water. Drainage slots and weep holes are milled so that any water entering the frame can escape outward. Cavities and slots for locks, hinges and handle fixings are prepared at this stage.

Machining is done before assembly and surface finishing, because it is far easier to work on bare profiles than on assembled frames.

Assembly, Glazing and Quality Control

The mitred profiles are joined at the corners using corner keys or mechanical joints, and the frame is checked for square by measuring both diagonals. Only when the diagonals match is the frame considered correct.

Glazing gaskets and glass are fitted next, and the sash is hung and tested for smooth opening and closing. Quality control at this stage confirms that the window matches the approved drawing.

Installation and Final Fitting

On site, the window is positioned in the opening, leveled and fixed through the frame into the structure. The gaps are sealed with the appropriate foam and sealant, and the internal and external finishing is completed.

The installer then tests all moving parts and hardware with the client, so any adjustment can be made while the team is still on site.

Frequently asked questions

Why are aluminum profiles measured on site before cutting?

Real openings are rarely exact, so an on-site measurement ensures the window is made to the actual space. Cutting from drawings alone risks parts that do not fit.

What angle are aluminum window corners usually cut at?

Most corners are cut at 45 degrees so two mitred profiles meet to form a right angle. The exact cut is always taken from the approved drawing.

What are drainage slots in an aluminum window profile?

They are small milled openings that let any water that enters the frame drain outward. This protects the hardware and the structure from moisture.

How is the accuracy of an aluminum frame checked?

The frame is squared by measuring both diagonals, which must be equal. The final window is also tested for smooth opening and closing before delivery.

Common mistakes to avoid

A common mistake is cutting profiles before the drawing is approved, which leads to wrong lengths and wasted material. Another is skipping burr removal, which stops corners from closing tightly.

Our recommendation

Always approve a written drawing with the final dimensions before any profile is cut, and ask for a diagonal check on every frame before glazing.

Summary

Accurate measurement, a clear drawing, precise cutting and careful machining together produce an aluminum window that fits and performs well.

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