How to Make a Straight Cut with a Nibbler?

Step 1 Secure the metal sheet in position.

Place your metal sheet in a secure position on your work table. Align the sheet perfectly on the workbench.

Secure it with your metal clamps. And if possible, use two of them on both edges. Tighten the clamps with the screws.

Tighten the clamping mechanism so that you can hold the metal sheets securely. However, do not over-tighten the thread as they may leave traces or indents of the clamps that could deform the metal sheet.

Step 2 Secure the straight edge on the workbench.

A straight-edge guide can be used for marking and cutting straight lines. 

Place the straightedge like a hollow aluminum section in the desired position where you need a straight line cut. 

Secure with metal clamps so that it would refuse to move out of place while you are cutting.

Step 3 Position the nibbler.

Before working with your nibbler tool, wear your protective gear. 

Position the tip of your nibbler on the edge of the metal sheet. Make sure to align it on the cutting path. 

Your dominant should be able to control the power switch and set the cutting speed. Use your non-dominant hand to guide the nibbler tool and follow the straight line. 

By either following the line you marked or by following against the straight edge.

Step 4 Set the cutting speed.

The cutting speed and thickness of your metal sheet will affect your cut’s quality.

For thick metal sheets, you will need a slower cutting speed. For thin metal sheets, you will need a faster cutting speed.

Remember that when cutting straight lines with a nibbler, you have to gain control and balance to avoid having a jagged cut.

If you’re new to cutting straight lines with a nibbler, start with a slower speed, then gradually increase the pace when you are comfortable.

Step 5 Start cutting.

Now that your nibbler is in the right position and at the right speed for your skill level, you can start cutting from the edge of the sheet metal. 

Glide the nibbler tool along, following the guide from the straight-edge tool. Keep the nibbler’s head perpendicular to the metal sheet.

Apply even pressure and glide with a slow and steady motion. This control will help you avoid jagged cuts and keep your cut straight.

Step 5 Deburr the cut.

You can use a deburring tool, like a file or sandpaper, to smoothen the edges of your cut in a straight line.

However, most nibbler tools do not leave behind a sharp edge that requires deburring.

Step 6 Clean up.

By this time, micro metal chips must have scattered all over your workstation.

Turn off your nibbler and remove metal chips stuck on the blade or gears. You can use a brush to collect the metal shavings, a shop vac, or a vacuum designed for collecting metal chips.

Collect the metal filings into a container and dispose of them properly. 

Make sure to wear gloves to protect your hands from sharp metal chips.

You can also use a strong earth magnet on the end of a stick to collect and remove the metal chips.

• Try practicing cutting a straight line with a metal scrap.
• Use a guide. If you don’t have a straight edge, a chalk line would do for free-hand cutting.
• Use the right nibbler that can cut through the thickness (gauge) of the metal sheet you are working on.
• Use and maintain sharp cutting blades.
• Always turn your nibbler off when not cutting.
• Don’t forget to wear safety gear. You can also use ear protection when cutting with nibblers.
• Make sure your area is well-lit.
• Have spear-sharp nibbler blades ready to go