Archive for WOT Blog

WOT activities quartile 2

Friday, November 11th, 2016 No Comments

Hi all, in quartile 2 we will again have many nice & interesting activities at WOT; especially on Thursday night but also over the weekends. Look below!

When? What? What??
17 november Arduino intro Learn how to wire up and program the Arduino microcontroller. We use these quite a lot for monitoring of prototype systems. No experience required!
26 november Excursion Essen & Wueppertal Visit to old industrial legacy sites in Germany, a coal mine and a train system among other thinsg.
1 december Intro car & engine inner workings Learn how cars operate and how to fix them!
15 december Windenergy lecture Wind energy consultant and WOT-member Marcel van Duijvendijk will give a lecture about the design of windmills. Both modern electricity-generating windmills and water-pumping windmills will be discussed.
11 januari New year’s drink Come and celebrate the new year!
19 januari Internet of Things workshop Connect up to the LoRa netwerk and learn how this new technology might be applied in developing countries.
3 februari Bowling Come and relax after the exam week with a nice round of bowling!



Upcoming activities @ WOT

Sunday, September 11th, 2016 No Comments

Feel like learning something beyond your current study program? Want to use your hands and learn something about technology for developing countries? Our activities and courses might be just the thing for you!

All activities will be free admission for WOT members. If you do not want to become a member just yet, you can also sign up for participation through our contact form. Check the google calendar app on the homepage for up-to-date starting times for activities. It’s no problem if you need to come later than the listed starting time though!

When? What? What??
14 september Info night Introduction and a tour of the terrain, as well as free dinner and fun at the campfire!
22 september Masonry workshop Learn how to stack bricks while we work on our shed!
24+25 september Survivalweekend We camp out on the WOT field while a professional instructor teaches you how to survive in the bush.
29 september Bike repair workshop Learn how to fix your bike using spare parts. Make sure to bring your own bike if you’re have any problems with it! Otherwise, we’ll have some busted bikes for you to exercise with.
6 october Advanced metalworking course This course will be teaching you the basics of milling and turning with our own mill and lathe in the WOT workshop. If you’d like to learn how to weld, you can also sign up for an individual welding course.
15+16 october Project weekend Various odd jobs and DIY projects will be tackled during this weekend of hard labour and great fun! We need all the help we can get!



Innovative freewheel clutch for rope pumps

Wednesday, May 18th, 2011 2 Comments

A directional brake

A directional brake

Since we already installed a number of rope pumps in the Netherlands, we were looking for a safety brake that is reliable and stultify the appearance of the rope pump not too much. As users rope pumps knows, the wheel and handle swings back firmly as they stopped with pumping. In developing countries the user get instructions to use the hook to prevent turning back of the handel. For public places where anyone can use the pump, the blocking hook will not be used and there is a change injuring the user.

Therefore our search for an automatic device that prevents the reversal movement.

Already been experimented with a kind of rattle that stucks in the spokes of the wheel. Tests showed that the forces where so enormous that the rattle pin bended. Another solution might be a band brake. This is also tested. Alongside that it is vulnerable to vandalism and this looks not so pretty, the braking power is not sufficient and reliable enough. A third type of a oneway brake with a nail into a wedge-shaped space in the bearing bush gave good results being better than expected. The video shows the pricipele operation, construction and testing of the oneway brake.




Spring on the WOT-field

Wednesday, March 23rd, 2011 No Comments

Daffodils in bloom at the Kijito

Daffodils in bloom at the Kijito

The days are starting to lengthen and temperatures rise. And on the WOT-field the nature has actually been in effect. Sometime in the distant past on the back WOT-field by a WOT member with very green fingers has planted daffodil bulbs. And miraculously come each spring the daffodils appear in the open field for us to cheer.




DIY Power Unit

Saturday, March 12th, 2011 No Comments

3kW generator lawnmower engine

generator in the making

After a quick experiment with a drill, an asynchronous electric motor, a capacitor and a lamp, we got the idea to build a generator. The aim was to connect the 3 kW electric motor to a 3.5 hp Briggs & Stratton petrol engine from a lawn mower. We fabricated a frame where both engines can be put down in two evenings. We took some pullyes and a v-belt for the transmission. The electric motor is fixed with wire ends, so the v-belt can be always be set tighter.

After cleaning up the engine the combination works perfectly. Only some vibrations appear caused by the engine. Perhaps the pulley must be fasten tighter or a damping suspension is needed. After that the capacitor must be connected to provide power. More news about the homemade power unit coming soon.

The lamp, we spoke about in the first sentence, had not a long life: After a high number of revolutions and huge light output the 60 watt bulb broke down.




ThW donates gas cylinder carts

Friday, March 11th, 2011 No Comments

From the Department of Thermal Engineering (ThW) of the University of Twente we got three gas cylinder carts for free! Ideas about what to do with it were found easily. One cart will be modified into a trolley and the other two will probably be combined into a convenient caddy.

Three cylinder carts in a row

Three cylinder carts in a row




Installation of rope pump in New Rotsoord, Utrecht

Wednesday, February 2nd, 2011 1 Comment

On Sunday, January 23rd, Freddy and Rene went to Utrecht to install a rope pump at the patting zoo ‘New Rotsoord’. This pump is the very first sample of a new design: the pump has a single support instead of a whole frame. As a result, the material costs drop 20 percent and the design becomes simpler.
The construction of the pump was done in Enschede. The only thing necessary at Nieuw Rotsoord, was the installation of the pump.

The pump is placed in a concrete foundation next to a 6-meter deep well. The intention is to let the volunteers of Rotsoord make a drive gear based on a bicycle.

Once we receive a picture we will definitely post here.




WOT Winter Wonderland

Thursday, December 23rd, 2010 No Comments

kerstgroentenIt’s Christmas time! Like many buildings, the WOT site got a makeover too last week. Thousands of Christmas lights bring magic to the place.
No doubt about it: all lights are LED’s!

It’s worth watching it, especially in snow.




WOT windmill build in Nepal

Thursday, December 23rd, 2010 No Comments

WOT windmolen in Nepal

WOT windmill in Nepal

The WOT 12PU500 windmill is being constructed in Biratnagar (Nepal). Students from Pulchowk Engineering Campus are building the windmill for local farmers, who use it for irrigation. Besides the windmill, students have developed a Hybrid Solar Dryer that can be kept warm by wood if there’s lack of sun.

Katrin Shrestha and Brecht Mommen from Nepal visited the WOT last week. They showed us a film about running projects in Nepal. You can watch several projects too; have a look at the website of Clean Energy and Learning Centre .

Brecht en Katrin bij een touwpomp in aanbouw

Brecht and Katrin at a rope pump under construction




T-Week Promo at Career Fair

Saturday, November 20th, 2010 Comments Off

The WOT stand

Quite a large number of T-Week participants are students studying for tropical doctor. To ensure this number won’t decrease the WOT was represented at their Career Fair today. It took place at the LUMC in Leiden. WOT member Mark Westra tried to convinced the 160 students the T-Week would be a valuable experience.
Most students had heard of the WOT before and few of them already joined the T-Week. (Even parents of some students had participated, 30 years ago!)

160 Student visited the Career Fair