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Member postings for dcosta

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

Thread: More security for the shed
09/07/2021 15:11:12


I apologize for the topic that is not exactly suitable for the forum. I'm Portuguese, I live in Portugal and I'm going to move house but, in the new house, the shed becoming more exposed forces me to install a perimeter alarm around the house and shed. I found on Amazon a kind of almost peripheral alarm but, as I don't know anything about it and before I spend hard earned money, I would like to know if there is any fellow in the forum who knows something about that alarm, directly or indirectly. "Hosmart Rechargable 1/2 Mile Long Range Wireless Driveway Alarm System Outdoor Weatherproof Motion Sensor & Detector (One Base Unit and Four Sensor)" .

** HERE**

This is the URL for the referenced alarm:

Thanks in advance
Dias Costa

09/07/2021 15:10:10


Need help to improve security in the shed.

Thread: EU materials suppliers?
05/02/2021 13:21:02

Hi Morse,
Did you look in Portugal?
What area of Portugal are you in?
I cannot guarantee you that you will find all the materials you are looking for in Portugal, just as easily as in England, but I can tell you that I never failed to find material here. You'll have to search...
As an example, at F. Marques da Silva ( you will find some of what you are looking for.
It seems to me that your greatest difficulty may be to know which terms you should use in the search.
If you need help and I can I will help you.
Dias Costa

Thread: How to Search for Text Inside Multiple PDF Files at Once
20/01/2021 21:17:07

Hi Peter,
I don't use Acrobat for reading PDF files. Instead I use free Foxit Reader you can find ***PROGRAM*** .

With that program follw instructions you can find ***INSTRUCTIONS*** .

Hope this helps.

Dias Costa

Thread: Windows 10 latest offering
27/11/2020 20:13:49

Hi Peter Greene,
As I had proposed to myself in a previous post, I installed a free VNC server on the Raspberry PI 4 (8GB) and installed a free client on Windows 10.
The package is called TightVNC and at the following URL you will find the way to download the software and instructions for installation and configuration:
It's a little slow, but it's been working well.

Dias Costa

19/11/2020 22:37:33

Hi Peter Greene,

Yes you are right. VNCViewer is not free. It provides a test version that I used intensively for some time, on someone else's computer, so I kept the name in memory.
But I also used, in another time and context, another VNC called TigerVNC, which is free, and if I remember correctly it worked well.
I will try to install the TigerVNC client on my computer and the server on an 8GB Raspberry PI 4 and then I will say something.

Thank you for correcting me
Dias Costa

Thread: Another rip-off
19/11/2020 15:20:52

Depending on the browser you are using (Mozilla FireFox, IE or Edge), you can find out what cookies are deposited on your machine and, if you want to be selective, choose which ones you want to remove using a free tool.
For that purpose I use a free and easy to use application. Possibly other tools will do the same ...
Check here please:

greetings from
Dias Costa

Thread: Windows 10 latest offering
19/11/2020 10:44:38

Hello John Rutzen.

The latest versions of the Raspberry Pi have wifi, which makes it easier for me to use it using the same monitor I use for Windows.
There is a free application called VNC Viewer that consists of two parts, one of which runs on Windows (as a client) and the other on Linux (on the Raspberry PI) as a server, which allows me to do so. So with a single monitor and a single keyboard I can access either Windows or Linux on Raspberry PI.
Naturally, VNC Viewer does not require wifi, so older versions of the Raspberry PI that do not have wifi can also be accessed via this route.
Check here please

Greretings from
Dias Costa

Thread: Optimum products?
19/10/2020 10:12:19


This is a photo taken from an Optimum catalog that shows that, at least in 2015/2016 their factory was in Yangzhou.
If anyone is interested in the catalog (220 pages, 21MB), I can make it available for download.

I have had a BF20 milling machine from Optimum since 2008 and I am satisfied with it.

Dias Costa


Edited By dcosta on 19/10/2020 10:14:10

Thread: Virtual Meet Ups
16/10/2020 19:09:45

Hello Neil,

I would like to participate if possible. Possibly only lurking. Spoken language is a barrier.

Dias Costa

Thread: Overseas Distribution to restart
20/07/2020 14:55:24


In the 1980s I made a purchase for the first time from a supplier in England. I bought a set of propellers for boat models. At the time of purchase, the price was lower than the price in the catalog and also in the order, but without the dynamics that the WWW allows now, I only knew that the price of the propellers had dropped some shillings / pences (?) when I received the propellers, the invoice and a note asking me how I wanted to receive the difference and informing me that, to minimize that difference, the supplier had decided not to charge shipping costs. My admiration for the supplier grew and, at the time, I thought that, in general, all (?) English traders would behave similarly. I was then thirty years old and I took it as a lesson.

A few minutes ago I paid £ 16.89 for two issues of a magazine (293 and 294) that I had paid in advance.

P.S .: During the pandemic I continued to receive products purchased from England, from other suppliers, at no additional cost and with only slight delays.

Did not like.
Dias Costa

19/07/2020 20:47:18

Hi Neil,

I also received MEW number 292 and it was the last one I received.
And, like Peter, I want to know if I am not going to receive numbers 293 and 294 and, moreover, whether I will have to look for them and buy them somewhere.
Will I be able to buy them from MTM?

Best regards
Dias Costa

Thread: Electronic Lead Screw Project
15/06/2020 16:23:00

Resuming this project, I verified that the synchronization between the rotary encoder and the stepper motor was not correct.
The rotary encoder (B E6B2 - CWZ6C) has a resolution of 1000P / R.
The motor stepper completes a rotation in 200 steps (1.8º per step) and the DM542 driver is configured in DIP switches for 8 microsteps (1600 Steps / Rev).

In the Configuration.h file, following Clough, i have


But, if I change the STEPPER_MICROSTEPS variable to 12, and test 40 rotations on the rotary encoder, the synchronization with the motor remains correct.

Although the sync remains correct, it seems to me that there is something wrong with this configuration.
Any opinions are welcome.

greetings from
Dias Costa

Thread: Corona virus testing
24/04/2020 09:52:40

Hi Mr. Robert Eggleston,

You wrote:
"Heaven above only knows we have enough of CV info 24 hrs per day on this side of the pond without having to view it from your side of the pond also."

If I understand correctly what you mean, I, who am the main side of the channel, opposite to your side, am in doubt as to whether your segregating will also applies to those on this side?

Dias Costa

Edited By dcosta on 24/04/2020 09:59:55

Thread: Fantastic British engineering
23/04/2020 16:33:34

Apparently it's a shaper. In **THIS** enlarged image, it is possible to see the groove where the shaper feedrate governing mechanism runs.
Also, in horizontal alignment of Father Christma's hand, to the right side, the T-groove of the fixing table appears to be visible.
Finally, to the right of Father Christmas's knee, what appears to be the manual feed handle of the table and the connection that transmits the rotary movement for the automatic advance of the table is visible.
Just an opinion

Dias Costa

Edited By dcosta on 23/04/2020 16:35:11

Thread: BF20LV problem
11/04/2020 16:24:03

Hi gary,

Some time ago I had a problem similar to yours and the cause could be the same.
Using the browser, please, search for the following, full, string:
site: https: // dcosta bf20
Perhaps you will find useful information ...

best regards
Dias Costa

Edited By dcosta on 11/04/2020 16:25:24

Thread: Websites contacting you
10/03/2020 17:27:06

Hello all,

I received from Firefox a message with this banner: "Keep Facebook off your trail".

For those concerned with abuse of the privacy of their data.
Firefox offers an extension that allows you to avoid spying in the context of their browser.

greetings from
Dias Costa


Edited By dcosta on 10/03/2020 17:33:19

Thread: Electronic Lead Screw Project
27/02/2020 20:19:22

Hi Dave,

Thank you for your help.
I took your suggestion, made a correction to a curly brace in a file and was successful.
The scope of the statement really had to be that. But as I lacked confidence, and as I'm not used to the development interface, I didn't dare.

I tried that feature and didn't like it. Perhaps because I did something wrong, the buttons randomly increase / decrease the value in jumps (not sequentially). Perhaps the function requires a short delay between each value ...
Maybe I'll try to add it.

best regards
Dias Costa

26/02/2020 23:41:49

Hello John,

Thank you for sharing information about your project.
I am interested in trying to add the functionality you refer to in your post to the program.
I have already started the process but, out of ignorance, I was forced to suspend the attempt.
I stuck in point 3. - here: "add this to UserInterface.h
int ButtonStateMachine (bool incrementButtonPressed, bool decrementButtonPressed) ";

Although I have professionally been a programmer / analyst for almost three decades, not having programmed in 'C', I am not sure where in the UserInterface.h file should I insert the line.

Could you do me a favor and tell me where that line should be inserted?

Thanks in advance
Dias Costa

25/02/2020 20:21:23

Hi Phil and others,

Thank you for your help.
With your encouragement, and based on the connections from another small stepper motor in another project, and using the multimeter to test, I tried a new connection that I think is called BIPOLAR PARALLEL.
I connected the RED wire and the BLUE wire,
I connected the YELLOW wire and the BLACK wire - constituting winding A
I connected the WHITE wire and the BROWN wire
I connected the PURPURA wire and the GREEN wire - constituting the B winding.
NOTE: in the meantime I found an ArcEuroTrade file (HYBRID STEPPING MOTOR MODEL 160-010-00400) which also describes these BIPOLAR PARALLEL connections as possible.

Now, the stepper motor has been connected for approximately three hours and has heated up to, perhaps, 45º (the hand supports the temperature well) and, as far as I can see, it works as well as before.
Thanks to the help received, I am finally satisfied and will be able to move forward on the project.

best regards
Dias Costa

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