By continuing to use this site, you agree to our use of cookies. Find out more

Member postings for Jouke van der Veen

Here is a list of all the postings Jouke van der Veen has made in our forums. Click on a thread name to jump to the thread.

Thread: Unimat SL modifications
05/10/2021 09:06:03

I saw now that both toolholders and toolpost are made from aluminium.

Dimensions are probably too small for Emco C5 but I have to check.

There are more aluminium sets offered on eBay but then from China.

03/10/2021 10:50:04

David,

Do you have a trade name for the QCTP.

Regards,

Jouke

02/10/2021 16:37:55

Yes, the qctp is interesting. Is the a set that is available on the market?. The tool holder is made from steel, so to see.

I would be interested in such a set for the Emco C5.

Thread: Small dc brushed motors
23/08/2021 09:15:41

Some years ago I completed a 1 meter long tugboat, originally built by my son 25 years ago.

Searching for a motor I found information on the internet to use a 12V brushed motor from a car interior blower.

Cheap and with sufficient power to give the boat the speed belonging to its scale.

Thread: You could not make it up ! [Olympic Cycling]
25/07/2021 17:37:46

I would guess: typically Dutch? 😉

Thread: Nickel Electroplating
19/06/2021 14:38:59

Nickel electrolytically deposited on the substrate is delivered by the nickel present in the bath. One of the bath constituants is often nickel sulphate. Of course, some ions dissolve from the anode but this hardly contributes to the coating.

Thread: GPO test meter fault
14/06/2021 20:35:27

Approx. 5 years ago it appeared that the 2A (highest) range of my at least 30 years old digital multimeter Circuitmate DM20L did not work anymore. It appeared that not only the fuse was blown but also the low ohmic resistor belonging to that switch range was destroyed. Possiblibly, the fuse had been to slow. I was able to replace that resistor.

The multimeter is still going strong.

Thread: Help , can someone provide me with some equations !
01/06/2021 21:07:20

What about Topic Starter Frankenstein. Did he disappear?

Thread: Hand cleaner
11/05/2021 21:03:32

👍

olive oil, as John Haine mentions, will have the same function as margarine/butter.

Edited By Jouke van der Veen on 11/05/2021 21:13:06

11/05/2021 20:45:56

My way of removing black machine dirt from my hands is to take a (very) small bit of margarine “butter” and rub that out on the dirt. You will experience that most of the dirt already dissolves in the butter. Then followed by spreading some washing up liquid on your hands. Finally, you rinse the mixture with the dirt in it from your hands under a running tap. But I understand that application of a protective cream before doing the “dirty” job is a further improvement.

Thread: Was this embrittlement, or what?
15/04/2021 09:12:18

Hydrogen embrittlement not be confused with liquid metal embrittlement.

During electrolytic qalvanising you do not only coat the substrate with a layer of metal but can also “pull” hydrogen into the substrate to be coated. This atomic hydrogen diffuses to higly stressed areas (crack tips) in the steel and there induce hydrogen induced cracking (hic). Hydrogen seems then to follow the tip of the growing crack. By the end the part fails because of a to large crack.

Hydrogen induced cracking should not be onfused with stress corrosion cracking in which a crack grows under stress in a corrosive medium.

Liquid metal embrittlement is dissolving of atoms of solid metal into a liquid metal. This especially happens along grain boundaries of the solid metal. So, after cooling down, you will find grain boundaries higly enriched with e.g. zinc. These weak grain boundaries may cause cracking if the part is under (a local) stress.

Edited By Jouke van der Veen on 15/04/2021 09:15:17

15/04/2021 08:54:55

Hydrogen embrittlement not be confused with liquid metal embrittlement.

During electrolytic qalvaning you do not only coat the substrate with a layer of metal but can also “pull” hydrogen into the substrate to be coated. This atomic hydrogen diffuses to higly stressed areas in the steel and there induce hydrogen induced cracking (hic). Hydrogen seems then to follow the tip of the growing crack. By the end the part fails because of a to large crack.

Hydrogen induced cracking should not be onfused with stress corrosion cracking in which a crack grows under stress in a corrosive medium.

Liquid metal embriittlement is dissolving of atoms of solid metal into a liquid metal. This especially happens along grain boundaries of the solid metal. So, after cooling down, you will find grain boundaries higly enriched with e.g. zinc. These weak grain boumdaries cause cracking if the part is under stress.

Thread: Anodising and Passivating
14/04/2021 21:24:33

Passivation is even applied on stainless steel to further improve corrosion resistance.

It is done with, e.g., hot nitric acid so that iron is removed from the surface and chromium enriched to form chromium oxyde.

I remember this process for components to be applied in aerospace machinery.

Thread: Was this embrittlement, or what?
14/04/2021 20:44:13

Liquid metal embrittlement? In this case molten zinc penetrating into the grain boundaries during brazing?

Thread: Gluing Aluminium
31/03/2021 17:17:44

MEK and Aceton used for the final cleaning step should be pure so that there is no residue left behind after evaporation. I mentioned Fokker for their bonding of aluminium for their fuselages. If I remember me well they applied anodising with open pores prior to bonding. And then again they had to be very careful to remove all anodising liquid to exclude corrosion afterwards during lifetime.

30/03/2021 20:47:56

Good to hear how to bond DRO brackets to the lathe in stead of bolting! I do not like to drill holes in original parts of a “vintage” lathe.

I think chemical or mechanical cleaning will be a better pretreatment than degreasing with an organic liquid.

30/03/2021 19:28:00

Dutch former aircraft company Fokker introduced and succesfully applied adhesive bonding of aluminium structures.

Cleaning and surface preparation prior to bonding was essential.

Adhesive bonding was not the cause of their bankrupt 😉.

Thread: Stoomgroep holland
13/03/2021 22:08:23

I appear to have an account for Stoomgroep Holland forum onderstoom.nl.

I have not been there since a long time.

Therefore it must be so quiet there.

But I am now logged in again.

How can I find your contribution there so that I can blow some Dutch steam into it?

13/03/2021 22:06:38

I appear to have an account for Stoomgroep Holland forum onderdtoom.nl.

I have not been there since a long time.

Therefore it must be so quiet there.

But I am now logged in again.

How can I find your contribution there so that I can blow some Dutch steam into it?

13/03/2021 21:56:49

Noel,

I live close to the German border, in Almelo.

The Netherlands are small and I estimate the distance to Alphen is approx. 150kms. So not so far from here.

Nothing to do for You concerning Stoomgroep Holland?

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Latest Forum Posts
Support Our Partners
cowells
JD Metals
walker midge
rapid Direct
BOLDON
Eccentric July 5 2018
emcomachinetools
Warco
Eccentric Engineering
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest