Tag - Electronics

K40 laser cutter power supply

Most problems with the K40 laser cutter involves the power supply in one way or another. Here is the facts about the laser power supply installed in most K40 machines. Introduction The K40 is a product made with parts to make a small and cheap laser machine. It is not developed or manufactured like this - it´s just the cheapest parts and solutions put in to a metal box. Now when we talk about the Laser Power Supply it is actually not made to...

K40 machine stops before job is done – fixes and issues

A lot of questions lately has been around machines stopping mid job, before the end or right away when starting a job. This is a issue no matter of your setup, controller type and/or other solutions. I will go through most common issues with communication for this problems in this article. 1: USB cable and setup - Most users have a laptop connected to their machine. Make sure all power saving programs/schemes are set to off. See guide here - If you are using...

Warning for new machine owners – grounding issues

This is a short warning with information how to solve the issue. More and more machines are delivered with deadly configuration on the grounding of the electronics. In China, the electric standard is not well built and many houses still do not have ground solutions in their house. So the machines are built by their standard, when we in EU or US or other parts of the world often have a good ground setup already in our homes since many years. If...

Troubleshooting a “no fire” issue

A new article about troubleshooting a no-fire issue is published here. Quick troubleshooting when the machine is not firing the laser any more. To begin with, make sure all wires and connections are good in the machine and make sure all cables are where they should be. Read up on the grounding-article here 1: Start the machine Does the machine home to top left position? if it does - go to #2 If it does not move - check fuses in the back of the...

Install a mA-meter on your K40 laser

Adding a mA-meter to your machine is one of the most important modifications you can do on this machine. The mA-meter will read the power trough your laser tube allowing you to set the power to a safe value to prevent the laser tube from over powering and thus saving the life span of the laser tube. Read more here about the most common reasons why your laser tube dies. Tools needed - Wire stripper, cutter and crimp tool. - Pliers or small wrench...

Upgrade your analog power knob

This is a upgrade of the analog power potentiometer to give you better control over the power level. It´s also easier to remember a number than a location of the pot. You can buy this from me prebuilt, ready to connect to your machine here. Or follow this guide to make your own! If you want to convert your digital K40 to analog with this solution - check out this conversion article. https://www.youtube.com/watch?v=PnDlF1QEebI Tools you need - Soldering iron and solder - Wire stripper and cutter Parts...

Upgrades & improvements on the K40 laser cutter engraver

The K40 machine is a awesome little product who makes it easy for hobby and semi-pro use to get going with laser cutting or engraving. It´s far from perfect and needs a hand to work as you intended. First reading should be the article about checking your machine - read it here. Water cooling Coolant tank Depending on where you live, it might be a good option to have a bigger tank 15-25L or more. If you live in a hot climate, you need a...

Adding more parts to the machine, lights and other.

The K40 machines differs a lot in what parts and function is has added, some has extra lights, laser dots and different parts already fitted, others are bare lasers. These machines are already on the edge of what the power supply can handle, adding more load to it may create problems. To solve this, we suggest that everything you add to the machine is connected trough a own power supply or smaller wall plug with correct voltage. Doing this you can rule...

Tilt your PSU´s – save your PSU from dying

The most important thing with electronics is sufficient cooling. You don´t need to follow this article and flip your PSU, but look into adding one or more fans to take out the hot air from the smaller compartment. Electronics are sensitive for heat and high temperatures. The higher temps the less efficiency you get out of the PSU. And now we are talking about Chinese middle class quality the temperatures are more important than ever. Here is my solution to this problem....

A word on USB-hubs

A small note on usb-hubs and using older computers or pad´s to run the machines. All computers has a usb-host controller, this one controls the data sent out and powers the ports. On older computers or smaller laptops there is one host-controller for all ports. On newer machines there is often one controller per port, or per set of ports.   What may happen is your laser starts to freeze up, it hesitates for a half second and then runs again. This happens because...