50W Laser Cutter Upgrades

Using that 50 Watt laser machine (see “Getting Control over a 50 Watt CO2 Laser Cutter from China“) for several weeks now, I have added a few upgrades to the machine.

Strong Magnets

Magnets

Alignment Tools

To better align items on the honeycomb, I have cut out an alignment helper from 5 mm plywood. With that I have found out that I really have a 39.5×39.5 cm cutting area and not 40×40 cm. Maybe I can adjust this with moving the zero position.

Alignment helper

Alignment helper

Measuring the height of the honeycomb bed, I noticed that the left lower corner was 1 mm off. Fixed that with a 1 mm washer. Added plastic zip ties to keep the honey comb in place.

Honeycomb fixture

Honeycomb fixture

Magnets

To tie down the wood properly to the honeycomb, I have added strong magnets to keep things down.

Strong Magnets

Strong Magnets

Works ok, but if the wood is deformed I need a different solution (see later in this post).

Water and Air Tubes

Originally the air and water tubes are just like this on the back side:

Air, water and power

Air, water and power

While not really necessary, adding proper protectors makes look more professional :-):

water and air inlets

water and air inlets

Front Door Stops

As the machine lid is hitting metal on metal, I added two small buffers to the bottom part to absorb the energy when closing the lid:

lid upgrade

lid upgrade

Lights

The default illumination was not enough for me, and hard to see things while cutting because of the tinted window (the two white stripes are the reflections of the lamps on the ceiling):

Original illumination

Original illumination

I added 4 LED stripes with a total of 600 Lumen to the inside of the cover:

24V LED Array

24V LED Array

That makes the view to the cutting area better:

Upgraded cutting area

Upgraded cutting area

High Voltage Wire

The red laser tube high voltage wire was very close to the water pipes:

Laser Tube High Voltage Connection

Laser Tube High Voltage Connection

So I moved the water inlet tube away:

High Voltage Wire

High Voltage Wire

Later I added some protection for the water tubes here too:

Tube Protectors

Tube Protectors

Additionally the wire got an extra black protection tube and better fixture tot he tube:

Extra High Voltage Wire Protection

Extra High Voltage Wire Protection

The wires for the lights got a better fixture too:

Cable fixture

Cable fixture

Water Chiller

That one for sure is the biggest upgrade I did. My workshop is not air-conditioned, and I saw that with cutting material the cooling water warmed up to 30°C, so I had to stop using the machine.

The original laser tube cooling is with a small aquarium pump with no active cooling. I tried the usually tricks with using ice packs to cool the water, but this all was really messy :-(.

Water cooling with deionized

First improvised laser tube cooling

I looked at the usual PC CPU cooling system, but this would have been rather messy too. An alternative would have been to use aquarium chiller systems which still needs an external water tank.

I asked around and checked many forums on that subject. What I ended up was adding an industrial cooling chiller (yes, again from China). I considered the CW-3000, but that one only has passive (fan) cooling so would not be good enough as the room temperature can be up to 30°C. I decided for the CW-5000 which is commonly used for laser tube cooling. So here is now the shiny (and overpowered) cooling engine:

CW-5000 Chiller

CW-5000 Chiller

It has an internal pump and water tank, can run in ‘intelligent’ mode (cooling temperature based on environment temperature) or ‘static’ mode (cooling to a given temperature). Yes, that one looks huge and usually is designed for laser tubes up to 100 Watts,  but I did not find any good and smaller alternative. But who knows, maybe a next machine will need that extra cooling power :-).

Water Chiller Backside

Water Chiller Backside

The tubing has been a bit challenging because of different diameters. The chiller uses 10mm tubes, but the laser had 8 mm ones. To connect the different tubes, I had to 3D print a custom connector:

Water Pipe Reduction

Water Pipe Reduction

This now connects the two different diameters. I plan to replace the original flexible tubes, but for now it works fine with no leakage.

Tube Connectors

Tube Connectors

 

Dealing with Plywood

I had some issues keeping down larger pieces of plywood. From the hardware store I organized heavy brackets which not only allow me to keep the material down, but serve as well as alignment tool.

Keeping down Plywood

Keeping down Plywood

Safety

Ah, yes: safety first. I still did not add a reed contact to shut down the laser if someone would open the lid. But added other safety measures:

Luckily I did not had to deal with fire yet (except a really, really tiny one 😉 ), so I have now a small water pump which can easily extinguish a small fire, of course only after shutting down the machine. For a bigger emergency I have a (powder) fire extinguisher ready, but that would be rather bad if I ever have to use it.

Fire Extinguisher

Fire Extinguisher

I always run the laser with the lid closed, but still I feel better wearing laser protection glasses. So I organized some special CO2 light protection glasses. Not sure how well protecting they really do for $20 from China, but I feel that might be better than nothing.

CO2 Laser Light Protection Glasses

CO2 Laser Light Protection Glasses

Summary

Over time I have added a few things which make that machine more effective or more safe to run. The biggest thing for shure is the water cooling system. There might be other DIY solutions, but really I did not want to mess around with ice cubes or anything like that. Overkill? Yes, for sure. But that’s a laser cutter as well :-).

What else I have in mind?

  • Laser cutter machine stand: Right now the machine is sitting on top of box with wheels. Need something better/higher. Something to put the cutting material/chiller/air pump etc inside
  • Air pump: I’m not happy with the wiring and the location of the pump, and I would like to turn it on/off.
  • Cover (reed?) switch: for safety reasons I want to be able to turn on the laser only if the cover is closed
  • Water cooling and air tubes: replace the original (soft) ones with more durable tubes
  • Air: now the ventilator of the machine uses the room air and blasts it out the window. I’m thinking about installing a second tube to get air from the outside, probably to the hole in the bottom of the machine.

So far I’m really happy, and I wish I would have more time on the weekends to operate the machine. But the lecture work has a higher priority for now. And if you have your own ideas and experience updating such a laser machine, let us all know with posting a comment!

Happy Updating 🙂

 

 

 

Advertisements

11 thoughts on “50W Laser Cutter Upgrades

  1. For future enhancements, have you considered a nitrogen gas assist? If I understand correctly, by displacing the O2, you don’t get scorch marks.

    Like

      • I wasn’t sure that nitrogen would help with cutting wood, but I found a few posts online that said it does prevent burning and scorching. If you can trust what you read on the internet, evidently it doesn’t require a high flow, just enough to displace the O2. Seems plausible.

        Like

      • Yes, it sounds very plausible. I did not had any issues with burning except for material too thick and too strong (mea culpa!), and scorching is not that bad (or even can make a nice effect).
        I don’t have nitrogen around, so it might be too much of an effort for too little of impact. But maybe others have some experience and can share it?

        Like

  2. We’ve got dry chemical extinguishers around the shop at the doorways, but I also keep a couple of CO2 extinguishers closer to the equipment because they don’t make a mess. There’s also one Halon 1211 bottle and a larger one of Halon 1301 but neither of those can be refilled anymore and I wouldn’t count on them working after so many years without service, but if CO2 doesn’t do the job I’m probably not going to want to stick around and fight a fire myself anyway.

    One of these 50w laser cutters is at the top of my wish list. No real justification for it yet, but someday…

    Like

    • Yes, Halon would be ideal, but hard to maintain or get. The one I have is a dry chemical one (will be a big mess if I ever have to use it, but better than nothing).
      As for the justification for the laser cutter: I really did not had one too, except just curiosity 🙂

      Like

  3. Great improvements !!! You are smart!!!
    1. Have you tried using a painting tape to fix it?
    2. Points from any, even cheap plastic should be protected, as they stop the wavelength of this laser (50 W). For metal lasers special glasses should be used. This is due to the wavelength of the laser.That is, if the plastic passed the wave, then it would not leave traces of the laser.
    3. A good idea with plastic clips for a small diameter of water pipes.

    Like

    • 1. Yes, I have used painting tape to fix items. It works for some items, but not for all.
      2. Yes, agreed, they do the job as well to some level, but blockign the specific wavelength helps too 🙂

      Like

What do you think?

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s