Compactly organizing an E12 resistor set

In this note I describe a simple and convenient arrangement of an E12 resistor set that, crucially, takes very little space.

Read on →

A fixture attachment system for CNC3020T

I found it convenient to have a table with a grid of nuts for attaching the workpieces, that could double as victim material. In this note I describe how to make such a table out of HDPE.

Read on →

CNC3020T: poor positioning accuracy

The CNC3020T mill that I own has terrible repeat positioning accuracy. In this note I explore cause and possible solutions of this problem.

Read on →

G38: Probing workpieces in LinuxCNC

Touching off to the workpiece by hand is tedious and error-prone. Fortunately, LinuxCNC has the very convenient G38 code family, which allows to automate this process. In this note I demonstrate how G38 can be used, using squaring aluminium stock as an example.

Read on →

CNC3020T: simple wooden fixture

The CNC3020T CNC mill doesn’t come with anything particularly useful for fixing the workpiece to the table. In this note I describe a simple wooden fixture that is suitable for securely attaching rectangular pieces of material to the table.

Read on →

CNC3020T: coolant pump and CCW rotation

In this note I explain the way to extend the 3020T CNC mill with a coolant pump (especially useful for milling plastic) and also, as a side effect, a spindle direction switch.

I have used a lot of locally-sourced components which will probably be unobtainable in other parts of the world. However, it should be trivial to find equivalent ones and adapt the instructions.

Read on →

Transistor as a light source

In this note I demonstrate that a bipolar transistor can be made to emit light.

Read on →

Producing PCBs using photolitography

In this note I describe a simple and quick photolitographic process with excellent repeatability that I use for producing high-quality PCB prototypes.

Read on →

CNC3020T: switch-mode power supply conversion

As I wrote earlier, the 3020T CNC mill has great mechanics, but somewhat flaky electronics. In this note, I will explain how to get rid of the transformer and use more efficient, more reliable, lighter, dual-voltage switch-mode power supplies.

Read on →

Making a lens using a CNC mill

Recently, I wondered if I could mill out a working lens using my CNC mill, for no other reason than curiosity. Turns out that yes, it is possible and even easy.

Read on →