CAD: An approach to mathematical curves for engineering

THIS ARTICLE IS UNDER CONSTRUCTION. YOUR POSITIVE INPUT IS APPRECIATED. Part 1, do the math Introduction Mechanical engineers sometimes need mathematical curves. For example: A satellite dish is a basic parabola. A gear has the involute of a circle as its base. These kind of curves are usually not directly supported in CAD systems. They […]

E-bike: Things that went right and wrong

Things that went North This page is a link from Conversion to eBike. Using microswitches for both brake handles for brake lights and engine stop turned out to be a very rigid solution. The batterypack construction, with EPDM isolation and aluminium housing is easy to make and rigid. The Sunkko 787A Hack created possibilities to […]

Welding: Sunkko 787A Hack

This page is a link from Conversion to eBike. The Sunkko spot welder has a bad reputation because of its poor quality. It is also popular because of its price. And last but not least: Expect fuses to fly around your ears, it sucks full 16 Amps (and maybe even a bit more when switching […]

A Do It Yourself back-up solution

A client, working in health care, had a special request: each working day she was filling in forms in a database with patient data. After the day was finished she wanted a back-up. In general, a back-up of an in use database is a bad idea. She was using Windows with a custom database application. […]

Old letters: ACTA

(ACTA zag het publieke licht ~2008) Dear Member of Parliament Many years of my professional life I spent on product development – from machines for microelectronics to trains. All those years my fellow technicians and I were watching competitors’ products very well. We investigated how things were built in order to imitate it – but […]


Capture a video of your actions on the screen and accompanying audio and you have a screen cast. This method is for Linux, probably OS-X too, is easy without bells and whistles. Software Install, if you don’t have it: Ctrl-Alt-t (voor terminal) 1 2 3 4 5 6 sudo su apt update apt install vokoscreen […]

CAD: Insert and units

You add an external drawing and suddenly the scale is no longer correct. It is a problem that everyone sometimes encounters. How do you solve that? This article explains the consequences of various unit settings. Do you draw in inches? Or mm? Or unitless? And how are “INSUNITS”, “INSUNITSDEFSOURCE” and “INSUNITSDEFTARGET” set? Do you find […]

About dog food

Meat for your pet. Help! My dog ​​is getting so thin. A broadcast of “Radar“, fresh meat is full of thyroid hormones because thyroid waste is added. Every dog ​​owner should actually see this. I was shocked. But it is not the first time that dog owners are startled. A nice starting point to get […]