Omar Khalid
If you've been using your plastic ruler for a while, its edges might have become bumpy and uneven. While a plastic ruler is meant for measurements, you can still sharpen its edges to draw straighter lines. To do this, attach a piece of sandpaper to a flat board and use the board as a guide to sand the ruler smooth. Start with 200-grit sandpaper and work your way up to 500-grit for a smooth finish.
| Characteristics | Values |
|---|---|
| Sandpaper grit | Start with 200 and work up to 500 |
| Sanding technique | Affix sandpaper to a flat board and use the board as a guide |
| Sanding alternatives | Belt sander, wet/dry sandpaper on a pane of glass |
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What You'll Learn
Use sandpaper on a flat board
If your plastic ruler has lost its straight edge, you can sharpen it by affixing a piece of sandpaper to a flat board. This method will ensure that you don't accidentally sand your ruler unevenly, which would ruin it.
To start, get a flat board that is preferably longer than your ruler. Then, attach a piece of sandpaper to the board. The sandpaper grit you choose will depend on the current state of your ruler and how smooth you want the edge to be. If your ruler has large bumps or imperfections, start with a lower grit, around 200, and work your way up to a higher grit, such as 500, for a smooth finish.
Once the sandpaper is securely attached to the board, place your ruler on the sandpaper, with the edge that needs sharpening facing down. Apply gentle pressure and move the ruler back and forth along the sandpaper. Keep the ruler flat and straight as you sand, using the board as a guide.
Check your progress periodically by feeling the edge of the ruler with your finger. You can continue sanding until you achieve your desired level of smoothness. Remember to always work in the direction of the length of the ruler, not across the width, to ensure you are only sanding the edge.
Using sandpaper on a flat board is an effective way to sharpen a plastic ruler and restore its straight edge. This method allows you to control the process and avoid over-sanding or creating an uneven edge.
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Use wet/dry sandpaper on a pane of glass
To sharpen a plastic ruler, one method is to use wet/dry sandpaper on a pane of glass. This is a good method for achieving a super-smooth edge.
First, you need to select the right sandpaper. For a smoothing effect, you will need to start with a lower grit sandpaper and move to a finer grit. For example, you could start with 60-80 grit and work your way up to 500 grit or more. The sandpaper should be made from silicon carbide, which is ideal for sanding and polishing glass.
Next, you need to prepare the sandpaper and glass. One method is to adhere the sandpaper to the glass using spray adhesive. However, this can be tricky to get right, as the paper may bubble. An alternative is to simply wet the glass and lay the paper on it, using the surface tension of the water to hold the paper in place.
Now, you are ready to sharpen your ruler. Place the ruler on the sandpaper and, using a consistent, gentle pressure, move it in a circular motion. Rotate the ruler regularly to ensure an even finish. Keep the sandpaper wet at all times to achieve a smooth finish.
Finally, you can finish the ruler with a polishing effect. Use a wet abrasive to lubricate the surface and prevent gouging or scratching.
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Use a belt sander
Using a belt sander is a quick way to sharpen a plastic ruler, but it must be done with care to avoid damaging the ruler or the sander. Here is a step-by-step guide on how to use a belt sander to sharpen a plastic ruler:
Step 1: Prepare the Belt Sander
Lay the belt sander down so that the belt is horizontal and moving away from you. This position will help ensure that you have better control over the sharpening process. Make sure the sander is securely fastened to a stable surface to avoid any accidental movement during the sharpening process.
Step 2: Choose the Correct Belt
Select a belt with the appropriate grit for sharpening plastic. A fine grit belt, such as 200 or higher, is recommended to achieve a smooth finish without removing too much material from the ruler. If you are using a Viel Tools S-5 sander/grinder, they offer a range of belt options that can be purchased separately to ensure a precise fit.
Step 3: Position the Ruler
Carefully hold the ruler across the belt, spine up, and edge down. It is important to maintain a steady hand to ensure that the ruler does not slip during sharpening. You can also try placing the ruler on the short slack belt section between the platen and the idler wheel for better control.
Step 4: Sharpen the Ruler
Slowly and gently rock the ruler back and forth on the belt, using angles of approximately 20 to 50 degrees. This motion will help create a sharper edge on the ruler. Be cautious not to apply too much pressure, as it can damage the ruler or the belt. Continue this process until the ruler's edge is sharpened to your desired level.
Important Considerations:
Always wear safety gear, such as safety glasses, when using a belt sander to avoid any injuries from flying debris. While a belt sander can effectively sharpen a plastic ruler, some people may consider it too aggressive for this specific task. Alternative methods, such as using sandpaper or a manual sharpener, can also be explored for sharpening plastic rulers.
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Use a piece of sandpaper
To sharpen a plastic ruler with sandpaper, you will need a piece of sandpaper and a flat board. The sandpaper should be affixed to the board, which will act as a guide to ensure that the ruler is sanded evenly. Start with sandpaper that is around 200 grit and work your way up to 500 grit or more for a smooth finish.
You can also use a belt sander to speed up the rough-sanding process, but some people may find this too aggressive for a plastic ruler. If you want an extremely smooth finish, you can use wet/dry sandpaper on a pane of glass.
When sanding, use the board as a guide to ensure that you are only sanding the edge of the ruler that needs to be sharpened. This will help you to avoid sanding the ruler unevenly, which could ruin it. Move the ruler back and forth across the sandpaper, applying even pressure, until the edge is smooth and sharp.
It is important to work your way up through the grits of sandpaper gradually to achieve the desired sharpness and smoothness. Starting with a lower grit, such as 200, will help you remove any large bumps or imperfections on the edge of the ruler. As you move up to higher grits, such as 500, you will be able to refine the edge and create a smooth, sharp finish.
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Sand it smooth
To sharpen a plastic ruler, you can sand it smooth. Affix a piece of sandpaper to a flat board. Using the board as a guide, sand the ruler smooth. The board will prevent you from sanding unevenly, which would ruin the ruler. Start with sandpaper that is around 200 grit and work your way up to 500 or so for a smooth finish. You can get the rough sanding done faster with a belt sander, but be careful not to be too aggressive, as you are sanding plastic. If you need the ruler to be very smooth, you can use wet/dry sandpaper on a pane of glass.
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Frequently asked questions
Affix a piece of sandpaper to a flat board and use the board as a guide to sand the ruler smooth. Start with sandpaper around 200 grit and work your way up to 500 or so for a smooth finish.
Wet/dry sandpaper is a good option for sharpening a plastic ruler.
Start with sandpaper around 200 grit and work your way up to 500 or so for a smooth finish.
A belt sander may be too aggressive for a plastic ruler, but it can be used to get the rough-sanding done faster.
Use sandpaper on a pane of glass to get your plastic ruler super smooth.
