Inside a 4-stroke piston engine

Yves Roumazeilles — Tue, 15 Jun 2010 18:39:36 +0000

You certainly know the basic principles of the operation of a 4-stroke engine with its different phases:

piston going down to suck gas and air in
piston going up to compress the mixture
piston going down pushed by the explosion
piston going up to push burnt gas out of the cylinder

Let’s admire the actual operation filmed at ultra-high speed from inside the cylinder:

Stepper motors, step-by-step

Yves Roumazeilles — Wed, 15 Oct 2008 11:52:15 +0000

Stepper motors are nearly everywhere. this is marvellous for happy hobbyists. Even better, you can find them (and extract them from) a large number of devices that are easy to hack like old floppy disk drives, hard discs. For those of you who would ike to know more and keep an eye on the technology, I suggest that followiung reading:

Control of Stepping Motors – A Tutorial by Douglas W. Jones
How to use disk drive stepper-motors by Tomi Engdahl
Stepper Motor Control by tigoe
Arduino Stepper Library (software)

Source: Jason Striegel.

motor – Roumazeilles.net

Inside a 4-stroke piston engine

Stepper motors, step-by-step