CNC-milling glass

In an earlier note I described an improvised vacuum chamber. I wanted to perform sputtering in it, but an acrylic flange would melt if the feedthroughs got hot enough (and they will get hot), and that would be pretty gross.

In this note I describe how I CNC-milled a glass flange.

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An improvised vacuum chamber

In this note I describe an improvised vacuum chamber made out of stuff I had laying around the house, and some fun things I did with it.

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MOSFET-based Gouriet-Clapp capacitive three-point oscillator

In this note I describe a Gouriet-Clapp capacitive three-point oscillator, which is an extremely simple circuit that produces high-frequency (~20-30MHz) electromagnetic field. It can light up gas discharge tubes and as such can be used to estimate pressure in vacuum systems.

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Photographing PCD8544

I had a broken Nokia 3310 LCD on my hands, so I decided to take a photomicrograph of the display controller, PCD8544. As far as I’m aware this is the first publicly accessible die shot.

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Closeup of a broken LCD

I broke a Nokia 3310 display, and in a closeup, both pixels and what appears to be segment electrodes at the border, are distinctive.

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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.

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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.

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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.

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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.

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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.

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