How to cut 2020 aluminum extrusion?
Many makers struggle with rough edges, uneven lengths, or ruined profiles when cutting 2020 aluminum extrusion.
To cut 2020 aluminum extrusion cleanly, you need the right blade, firm clamping, burr control, and proper lubrication. These steps ensure accuracy, safety, and professional results.
Most people don’t realize that cutting aluminum is different from cutting wood or plastic. In this guide, I’ll walk you through the exact process I use in my workshop to get clean, repeatable cuts every time.
What blades work best for 2020 profiles?
Cutting 2020 aluminum with the wrong blade often leads to jagged edges, aluminum dust, or overheating. It’s a waste of time and material.
The best blades for 2020 extrusion are carbide-tipped circular saw blades with a high tooth count, ideally 80T or more. These provide smoother cuts and reduce vibration.
I’ve tested several types of blades over the years, and the differences are clear. Woodworking blades might seem like a shortcut, but they often gum up or chip. Dedicated non-ferrous metal blades are designed for aluminum and will give you the best finish.
Recommended Blade Specs for 2020 Extrusion:
| Attribut | Anbefaling |
|---|---|
| Blade Type | Hårdmetalspid |
| Teeth Count | 80–100 tænder |
| Blade Diameter | 10–12 inches |
| Hook Angle | Low or negative (−5° to 0°) |
| Materiale | For non-ferrous metals only |
Why high tooth count matters
More teeth mean a finer finish. This is crucial when cutting 2020 profiles, where you often join parts tightly using T-nuts and bolts. A rough cut can interfere with the fit or cause alignment issues.
Also, blades with a negative hook angle reduce the chance of the material climbing the blade, making it safer and more precise.
Using a high-tooth-count, carbide-tipped blade improves cut quality on 2020 aluminum extrusion.Sandt
More teeth create smoother cuts and reduce vibration, especially in lightweight profiles like 2020.
Wood-cutting blades are suitable for aluminum extrusions if used slowly.Falsk
Wood blades can overheat, clog, and chip aluminum; they are not designed for metal.
Why secure 2020 extrusion before cutting?
Unsecured extrusion tends to move, twist, or vibrate during cutting. This causes uneven cuts and safety hazards.
You must clamp 2020 aluminum extrusion tightly before cutting to maintain accuracy, protect the blade, and avoid injury.
A single loose cut can ruin an entire batch of profiles, especially in precision builds like 3D printer frames or CNC machines. I always secure my extrusion using quick clamps or a custom jig.
How I secure extrusion in my shop
Here’s the exact method I use:
- Place the extrusion on a miter saw stand with support rollers on both sides.
- Use two clamps: one horizontal to hold it down, and one vertical to prevent side movement.
- Double-check the alignment before turning on the saw.
Benefits of securing aluminum properly:
| Fordel | Beskrivelse |
|---|---|
| Lige snit | No shifting means better accuracy |
| Cleaner finish | Reduced chatter during cutting |
| Longer blade life | Less chance of binding or teeth damage |
| Safer operation | Material won’t kick back or jump |
Even if you use a high-end blade, poor clamping will ruin your results. Secure cutting is essential for both beginners and pros.
Clamping the 2020 extrusion ensures cleaner and safer cuts.Sandt
Clamping eliminates movement, which leads to straighter cuts and reduces vibration.
It's safe to hold 2020 aluminum by hand while cutting if you're careful.Falsk
Manual holding is unsafe and leads to inconsistent, dangerous cuts.
How to reduce burrs on 2020 cuts?
Burrs are sharp, ragged bits left on the edge after cutting. They make parts hard to assemble and dangerous to touch.
To reduce burrs, use a sharp blade, cut slowly, and finish with light deburring using a file or deburring tool.
I’ve learned that speed matters. Going too fast creates heat, which melts aluminum and creates burrs. If you feel resistance, slow down. Let the blade do the work.
My burr-reducing process
- Cut with a high-tooth-count blade at medium speed.
- Immediately after cutting, I lightly run a deburring tool along the cut edges.
- If a smoother edge is needed, I sand it lightly with 320-grit sandpaper.
Other tips that help reduce burrs
- Keep your blade clean—built-up aluminum causes more tearing.
- Don’t force the extrusion through the blade. Gentle pressure is key.
- Use blades designed for aluminum—not wood or steel.
Tools I recommend for deburring:
| Værktøj | Brugssag | Prisinterval |
|---|---|---|
| Hand deburring tool | Quick edge cleanup | $10–$20 |
| Flat metal file | Heavier burr removal | $5–$15 |
| Sandpaper (320 grit) | Final smoothing | $3–$10 |
Deburring helps prevent injury and improves the fit of 2020 extrusions.Sandt
Clean edges make assembly easier and safer.
Using high-speed saws without deburring tools is the best way to reduce burrs.Falsk
Speed creates heat and more burrs; slow cutting and post-processing are better.
Can lubrication improve cut quality?
Dry cutting aluminum often creates friction, heat, and premature blade wear. This shortens tool life and worsens the cut.
Yes, using lubrication can improve cut quality, reduce friction, and extend the life of your blade when cutting 2020 aluminum.
When I first started, I avoided lubrication because I thought it was messy. But once I started using cutting wax and sprays, I noticed a huge difference.
Cuts became smoother, and my blades stayed sharp longer. Plus, the reduced friction meant fewer burrs and cleaner edges.
Lubrication options I’ve used:
| Type | Fordele | Ulemper |
|---|---|---|
| Cutting wax | Clean, easy to apply | Needs frequent re-application |
| Cutting oil | Long-lasting, effective | Can be messy |
| WD-40 spray | Readily available | Not as effective as real cutting fluid |
I typically apply a small amount of wax to the blade before cutting. You don’t need much. Just a thin coating is enough to reduce drag and lower the temperature.
When you MUST use lubrication:
- If you’re making more than 10 cuts in one session
- If your cuts are starting to spark or smell
- If the extrusion is thicker than 2mm walls
Lubrication isn’t always needed for a single quick cut, but for batch jobs, it saves both time and money in the long run.
Lubricating your saw blade when cutting aluminum improves cut quality and blade life.Sandt
Lubrication reduces heat and friction, which helps keep blades sharp and cuts cleaner.
Lubrication is unnecessary and only causes mess during aluminum cutting.Falsk
While messier, lubrication greatly improves results and tool lifespan.
Konklusion
Cutting 2020 aluminum extrusion doesn’t have to be frustrating. With the right blade, firm clamping, proper lubrication, and a burr-removal routine, you can achieve clean, accurate cuts every time.
