2017 New Year Laser Cut “Rooster” Sunglasses

2017 is just around the corner, and you might have seen some funky “New Year” glasses that are quite popular this time of year. I’ve decided to make my own and share the design.

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December 31st, 2016|Laser machine|2 Comments

DIY Pin table V2.5

A while back I wrote about making pin “vector” table for laser cutter (here and here).

There were some issues with it that I discovered later on.

First issue with rivets height.  I don’t know how I missed it by some of them had huge variation, resulting in very uneven distance from laser head.

Second issue what with […]

May 3rd, 2016|Laser machine|0 Comments

Extending probe for digal temperature gauge

I love these visual LCD temperature gauges. They have this nice LCD screen, can be switched between Celsius and Fahrenheit and most importantly have long waterproof temperature probe.  And cost just under $5 shipped from China on eBay.

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February 13th, 2016|How To, Laser machine|0 Comments

How To: Upgrade 50W Chinese laser cutter to 60W

It’s been almost a month since i upgraded my SH-G350 laser cutter to 60Watts of cutting power.  Here’s at last a comprehensive How To guide for all you DIYers out there.

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January 13th, 2016|diy, How To, Laser machine|1 Comment

DIY “Stud Table” for laser cutter for under $8

DIY pin table that I made a while back seemed great at first, but then I realized that not all rivets have same height. I only measured few from first box, and they looked to be same height, so I didn’t check others.  I didn’t really notice this until recently and got a bit upset.

So meet DIY […]

December 18th, 2015|diy, Laser machine|0 Comments

How to add ammeter to 50W Chinese laser cutter from eBay

Ammeter add-on was on my to do list for a long time. It’s important to know what current is flowing thru your CO2 tube so you don’t shorten it’s life. Ammeter measures current and in case of this SH-G350 machine you’ll want ammeter rated in the 0-30 or 0-50mA range because most CO2 laser tubes run under currents under 25mA.

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November 20th, 2015|diy, How To, Laser machine|12 Comments

60W laser upgrade

It’s no secret that my SH-G350 laser machine, a.k.a. 50W eBay laser cutter, is not really a 50W.

Yup, it’s one of the biggest scam on the eBay.  What you get is actually a machine with 35-40W watt 800mm long CO2 tube, that’s being overridden with higher current to work like 50W.

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November 13th, 2015|Laser machine|6 Comments

Cu laser mirror

Back in February I wrote a post about mirrors used in CO2 laser machines.  Here’s a little update.

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November 13th, 2015|Laser machine|0 Comments

DIY Lighted Marquee Sign for Halloween

For this year I decided to do a Circus themed Halloween party.  One of the major props for the part was supposed to be a large lighted “Circus” marquee sign (also called dimensional lettering).

There are more than few tutorials on how to make such sign, most of them involve using some kind of thin sheet […]

November 5th, 2015|diy, How To, Laser machine|Comments Off on DIY Lighted Marquee Sign for Halloween

How to add beam combiner to SH-G350 laser cutter

CO2 Laser cutters are insanely cool, but there’s one problem. We cannot see infrared beam, so it’s always a guesswork where laser is actually will hit the work piece. Many laser cutters including SH-G350 come with a red laser pointer attached near head cone, but they are far from accurate.  One that came with my machine annoyed me to the point that I disconnected it completely. It never points to where laser is cutting (mine was about an inch off to the side) and it can only be adjusted up or down. Spot gets larger or smaller depending on where your z-table is located. And to make things worse,there was something wrong with mine as it kept on overheating and fading.

So what is beam combiner and why would you want one?

As you can see from the illustration beam combiner is a special lens that only let’s certain wavelengths thru, and reflects all others. In our case Infrared laser beam passes thru it, while visible red laser reflects. By adjusting angle of the lens you can get both beams to travel same path.  You can actually see where IR laser beam is going and where it will end up on the table!

No more guessing, where you cut will be. As added bonus this makes it insanely easy to align mirrors. You don’t have to burn pieces of paper anymore! But wait, there’s more 🙂 ZnSe lens will also focus red laser beam, so you can even see if focal distance to the object is ideal!

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July 10th, 2015|3D Printing, diy, How To, Laser machine|0 Comments