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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: Repair a small cast bell
01/08/2023 13:38:59

I think the copper layer will remain extremely thin.

Copper will deposit and iron will go into solution as long as the iron is in contact with the solution.

Then the process of ion exchange will stop.

On top of this adhesion may be not so good. Cleaning or pickling is important.

The copper ion exchange process is also known for checking cleanliness of iron/steel parts.

Regards,

Jouke

Thread: to divide a circle
24/05/2023 15:32:52

Hallo Michel,

You can construct an exact angle of 72 degrees using a compass and a ruler to draw straight lines. So, without using a protactor.

The analytical method to be followed is described on Internet.

Regards Jouke

Thread: Some VERY interesting LED modules
14/01/2023 20:25:44

Sorry for my stupid thinking. I should do better!

It is normal physics, so to say.

Edited By Jouke van der Veen on 14/01/2023 20:29:30

14/01/2023 20:06:35

That’s quite a big heat sink! And Robert’s calculation showed that a 1.77K/W would be needed, so even bigger.

I am thinking of replacing a dimmable “up-lamp” now fitted with something like a 150W 118mm r7s halogen bulb.

This lamp creates a lot of heat but no heatsink is needed.

When mounting a led module as discussed here a big heatsink will be needed. I doubt I can find space for this.

14/01/2023 15:51:18

Perhaps a good price but what about quality? Further, no dimming function.

And perhaps low price is compensated by costs for postage, at least to The Netherlands.

13/01/2023 19:52:44

Hallo Robert G8RPI,

The dip-switch values for the EUP30A and EUP30D are the same, so to see.

650mA/9-45V and 700mA/9-43V for both.

And I found in a datasheet that the EUP30A is dimmable by means of a passive resistor (simple potmeter?).

Somewhere else it was said that you should not apply a led driver above approx. 80% of its maximum power, higher would have a negative influence on its lifetime.

13/01/2023 18:27:08

Perhaps the difference between 0-10V and 1-10V dimming I mentioned above is wrong.

Perhaps a CC Led driver with a “sink” dimming system only needs a potmeter for dimming while a driver with “source” dimming needs a dimmer which feeds a DC voltage (0/1-10V) to the driver?

13/01/2023 15:59:34

Double

 

Edited By Jouke van der Veen on 13/01/2023 16:00:01

13/01/2023 15:52:39

But the recommended type is clear: EUP30D with Dali.

I understood that with a 0-10V dimming you can do this just with something like a 100kOm potmeter connected to the driver and that with a 1-10V dimming you need an active adjustable voltage supply connected? Is this really the case?

13/01/2023 10:58:53

Can somebody tell if this LED system is dimmable with, for instance, an Euchips 30 Watt Constant Current Dali and1-10 Volt Driver 550-900mA, with dip switch settings 700mA-43VDC?

Or even simpler with a 0-10V dinmming with a 100kOhm potmeter?

Regards,

Jouke

Thread: Emco Compact 5 Top slide gib
26/11/2022 09:34:58

Good morning Ozen,

I sent you a PM

Regards,

Jouke

Edited By Jouke van der Veen on 26/11/2022 09:35:24

25/11/2022 15:27:34

Hallo Ozen,

I had a quick look at all those nice features you added to your Emco C5. Above you wrote about shipping costs from the Emcoshop (Emco Holz & Hobby) into The Netherlands. Do you live in The Netherlands?

Regards,

Jouke

24/11/2022 11:29:11

When I bought a second top slide the gib was also missing. I made a gib strip from a 2mm thick PVC tube (in length direction of course) as a “temporary” solution and I must say: it works well. The concave side of it is directed to the gib screws.
For my second cross slide I made a gib strip from a brass strip and that works even better.

Regards,

Jouke

Thread: Emco Compact 5 Leadscrew Bush Slipping
22/11/2022 19:09:48

There should be some but minimal play between bushing and handwheel, otherwise you clamp the bushing and rotate it together with lead screw and handwheel.

22/11/2022 18:47:41

Is there a supporting ring between the bronze bushing and the bottom of the hole in the bed casting?

Please, have a look in the Emco C5 manual with exploded view in the spare parts chapter.

The exploded view shows the assembly.

Regards,

Jouke

Edited By Jouke van der Veen on 22/11/2022 18:50:23

Thread: An Observation, and Conundrum
18/11/2022 13:35:10

This invites for experiments!

Thread: Unimat milling table - post modification
14/11/2022 19:00:32

Yes, that is what I meant with the proposals bij Maurice Rhodes.

The modification to the Emco Compact 5 column from Jamie Wood, shown by Graham Meek, is a bit of the same.

Both are nice solutions with (almost) no modifications to the original Emco parts.

14/11/2022 10:13:02

A question.

Is the Unimat 3 clamp on the milling column different from that on the Emco Compact 5? The latter is from a thin walled casting and has hollow spacings. So, you can not machine it everywhere to ad new features.

Of course, You could make your own solid clamp and modify that.

Regards,

Jouke

13/11/2022 21:07:42

What about the modifications/additions to the Unimat 3 column made by Maurice Rhodes?

Some of his modifications were discussed recently on this forum.

Look e.g. for the topic “Maurice Rhode’s Unimat 3”.

Regards,

Jouke

Edited By Jouke van der Veen on 13/11/2022 21:12:47

Thread: Unknown gun tool
24/09/2022 15:22:52

Thank you very much for your quick responds! A friend of my son is involved with sorting out all the tools in the workshop of his late father in law. I try to help him a bit by identifying tools, equipment, etc. Fro photos he sends to me. Thank for your support, I may come with more questions.

Regards,

Jouke

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