Build a Mini Laser Cutter: Step-by-Step Guide

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Discussion Overview

The discussion centers around the construction of a DIY mini laser cutter, specifically one that is small enough to resemble a laser pointer. Participants explore the feasibility of cutting various materials, including plastic and iron, and share ideas on the necessary components and safety precautions.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants suggest starting with a laser diode extracted from old optical drives, noting that a 200mW output could be effective for cutting soft materials.
  • Others question the practicality of using a laser pointer's low power (around 1mW) for cutting hard materials, implying that significantly more power would be necessary.
  • One participant proposes using a 500mW laser diode with a specific lens configuration and a cooling system, asking if this setup could work for a laser cutter.
  • Concerns are raised about safety, particularly regarding eye protection when using lasers above 5mW, with emphasis on the potential hazards of reflections.
  • There is skepticism about the ability to cut through iron with a small laser cutter, with one participant humorously questioning the feasibility of such a powerful tool being compact.

Areas of Agreement / Disagreement

Participants express differing views on the feasibility of cutting hard materials with a small laser cutter, with no consensus on the required power levels or the practicality of the proposed designs.

Contextual Notes

Participants have not reached a definitive conclusion on the cutting capabilities of various laser powers, and there are unresolved questions regarding the availability of specific laser diodes and the effectiveness of proposed configurations.

weitao
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How to make a DIY laser cutter(small size) ? Can you help me?
 
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weitao said:
How to make a DIY laser cutter(small size) ? Can you help me?

Well, first you need a laser, and you need to know how to operate it safely. What laser do you plan on using? What material do you want to cut?
 
i want to create a laser cutter small as laser pointer! I want to cut plastic, iron and so hard material!
 
This can be done quite simply with a laser diode (LD).

For instance, extracting an LD from an old CD-RW, DVD-RW or Blu-Ray drive and building a driver circuit could give you a laser with a power output around 200mW (the average laser point is < 5mW). If this is focussed it could burn through paper, electrical tape, pop balloons etc.

However, you MUST have eye-protection on for this. Any laser above 5mW is class 3 and can permanently damage your eyes. Whilst shining the beam at an object seems safe, it can reflect off shiny surfaces...
 
weitao said:
i want to create a laser cutter small as laser pointer! I want to cut plastic, iron and so hard material!

A laser pointer will generally put out 1mW or so of radiant energy. How much optical power do you think it would take to cut even a soft material? You can estimate that number by remembering that you can use a 10cm magnifying glass in bright sunlight to melt soft materials...
 
weitao said:
i want to create a laser cutter small as laser pointer! I want to cut plastic, iron and so hard material!

A key-chain laser pointer that can cut through iron? Would you like a spaceship to go with that, or would that be all, sir?
 
Is I use almost 500mW d.c. and use tow convex lens has focal length of 5cm and the distance between them is less than 1cm, and add a cooling system by using liquid! Can the laser cutter form?
 
weitao said:
Is I use almost 500mW d.c. and use tow convex lens has focal length of 5cm and the distance between them is less than 1cm, and add a cooling system by using liquid! Can the laser cutter form?

You have a 1/2 Watt laswer diode? Where did you get it?
 
berkeman said:
You have a 1/2 Watt laswer diode? Where did you get it?

Is 0.5W laser diode hard to find? If I have, can the plan that I post previous one work?
 
  • #10
Well, 500mW is very powerful. Just make sure you use goggles...

And the rough plan sounds ok - essentially you need a driving circuit (inc. cooling) and some way of mounting it with a lens to focus the energy. I don't know what exactly are the 'cutting limits' with this but you'll certainly burn through paper and thin materials (even at a distance).
 

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