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

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: My milling machine Optimum BF20 Vario electronics has problems
07/06/2016 16:40:03

Dear all,


When testing the new electronic board again, I realized that the noise was coming from the main button on/off of the milling machine.
A further examination using a mirror showed me that two of the switch terminals showed signs of being badly burned.
Before ordering from the Optimum
distributor in Portugal, I have searched for the switcher on the WWW and I found it only somewhere in Romania and, apparently, they sell it only in quantity.
The written reference on the switch is as follows:

Its image is as follows:


Will someone, among the distinguished participants in the forum, can give me some clue or guide to where I can find it?

Thanks in adavance
Dias Costa

Edited By dcosta on 07/06/2016 16:52:31

04/06/2016 00:20:11

Dear All,

A few days ago my milling machine Optimum BF20 Vario started making a pulsing noise similar to interrupt for a moment normal noise after pulsing, then normal, and so on ... At the same time the built-in lamp that receives power from the same source shimmered.
Thinking the cause was the speed driver board I bought a new one and today I installed it.
When I start the milling machine, being very close to the electronic boards, I hear a very low noise that reminds me eggs to be fried and, moreover, the pulsing behavior remains.
Apparently the electronic board speed control is not to blame.

In the documentation of the milling machine, Optimum (the distributor) calls the power board "relay board".
I identify in it a transformer but I am not able to identify any other components.
In the board I can read can read the following: 608BD / 230V 0710300050 P / b ROHS 05/25/2007

Searching the web I didn't found any reference to a plate with those sayings.
I did further research with other criteria but was not successful.

Will someone, among the distinguished participants in the forum, can give me some clue or guide?

I can, if one wants, add some photo of the two electronic boards but, as both are in a position that makes it impossible for a decent photograph, I can show photographs of sections of each electronic board.

Thanks in advance
Dias Costa

Thread: Change in Subscription Bureau
06/11/2015 09:47:05

Hello Neil, good morning.

Thank you for your help.

In the text found on your **LINK** the only occurrence of the word renew has no use for the purpose of renewing the subscription.
And, if I try following the option subscribe in the black bar, there's no option to ask for the continuity of the subscription by stating I want the start of the new year subscription renew with the issue immediatly after the last issue of the previous renew. It even doesn't ask for the subscription number. Strange...

Can you help me and my friend further, please?

Dias Costa

03/11/2015 21:54:32

Hello Neil, good evening.

A friend of mine, here in Portugal, needs to renew his subscription (number 0030047142) and can't find the correct address to do so.
Can you, please, let me know the address to pass for him?

Thanks in advance,
Dias Costa

Thread: Disassemble and then assemble of an Emco Compact 8 three jaw chuck
16/09/2015 20:19:42

Hello Clive, John and Thor.

I bought my Emco Compact 7 lathe
in 1982 and never opened the chuck since.

Today, after disassembling the chuck I saw that she had grease, in addition to lubrication that I put there in the volute and the jaws, in places I could not reach. So I think the chuck was lubricated at the factory with a black grease.
I found that the bevel gear has teeth slightly marked by use. The other parts of the chuck are in very good condition.
Since I have no graphite grease or dry graphite in the workshop, I used Molykote. I may have abused a little in the volute but, as access to it is easy, I will easily remove the excess grease soon.

To Clive: I couldn't found the stick trays in the supermarket. Thank you for your kind offer. It is a shame that we are so far apart...
I usually put the cutters in a plastic box having compartments after I warp them in kitchen paper towel soaked in oil. Some of them I keep in their original boxes when they have it. The last set of milling cutters I bought from Arceurotrade came in very well made boxes which are perfectly suitable for storage. It's a pity Arceurotrade doesn't sell just the boxes...

Especially for Thor: I made a mistake when I started to mount the chuck that scared me. I screwed too tight the pinion's pins and when I tried to fit the jaws, I could not do it. After correcting the blunder, apparently everything was working well in the chuck.

Today I mounted in the Emco Compact 8, for the first time, a 125mm chuck I bought from Emcomachinetools awhile ago. It's a nice Bison chuck but its size strange appears too strange...
One of these days I'll check its concentricity.

Thank you all for your help
Dias Costa

16/09/2015 15:03:35

Hello Clive, good afternoon.

Thank you for your help.
At the moment I don't have any grease with graphite. But I do have a grease with Molibdenium (Molykot) and another grease with Lithium (BP Energrease). Do you think some of them acceptable for the purpose?

Dias Costa

Edited By dcosta on 16/09/2015 15:32:23

16/09/2015 11:06:41

Hello Thor, good morning.

Thank you for your help.
Already dismantled Chuck and everything went well thanks to the information you gave me.
I have one more question: what kind of grease you used? Thin, thick, sticky, made with lithium, etc.?

Thanks in adavance
Dias Costa

15/09/2015 20:46:24

Hello all, good evening.

My lathe is a Compact 8 one and I want to clean the inside of its three jaw chuck.
Does some of you, Compact 8 owners, have already dismantled the chuck and can tell me how to do it?
Or, alternatively, tell me where to find an exploded view of the chuck, possibly with instructions for disassembly / assembly?

Thanks in advance
Costa days

Thread: Blackening mild steel
11/09/2015 10:43:21

Hello all, good morning.

I found a formula for blackening ferrous metals which uses four ingredients: distilled water, tannic acid, ethanol and diluted phosphoric acid.
The formula is from the Canadian Conservation Institute and can be downloaded from ***here*** .
Two years ago I experienced subjecting various steel items to the solution and it worked. Some items were slightly marred by a less dark black.
I have not used in everyday the objects subject to treatment, so I do not know what the durability of the black layer is.
The document has a chapter dedicated to conservation called "Care of Objects Treated with Tannic Acid"

Extracted from that document here is the recipe for one litre of 10% solution of tannic acid:
100gr tannic acid
about 900ml of deionized or distilled water
50ml ethanol
Aprox 2ml of dilute phosforic acid (H3PO4), if available

I hope that the formula has some use to anyone.
Dias Costa



Edited By dcosta on 11/09/2015 10:46:03

Thread: The Interesting Video Thread
05/09/2015 21:11:47

Hello all, good evening!

My grandfather was a blacksmith and, among other things, he repaired hoes to neighboring farmers. The corners of hoes were worn and he "glued" them new corners with his hammer. He warmed the hoe until it was yellow hot and put on it a new metallic triangle, also yellow hot, which pounded until it was pasted. But, between the hoe and the new piece, he put a small portion of a hard material, gray, which included within a metalic wire mesh and had a reticulated surface.

Does anyone know and tell me, please, what material was that?

Thanks in advance
Dias Costa

Thread: How to ensure parallelism of several holes in long rod
19/08/2015 00:19:40

Hello all,

I made a gross error. The holes in the rod are radial, not axial.
I apologize to everyone especially Paul Lousick who took the trouble to examine my problem with bad data.

Once again, thank you all
Dias Costa

Thread: Universal bender
18/08/2015 22:22:05

Hello all,

Thank you for your help and ideas.

I bought the bender from ArcEuroTrade ***HERE*** .
I'm satisfied and already made a bunch of hooks. I had to make some more pins for the needed dimensions and they worked fine. See ***HERE*** please.

Thank you for your help
Dias Costa

Thread: How to ensure parallelism of several holes in long rod
18/08/2015 22:06:05

Hello all,

I forgot to tell you that the holes are axial and their centers are located at about 15mm of the rod terminals.
Taking into account the limitations on the equipment at my disposal, the suggestion of IantT seems to me the one that best fit so far.

You can see ***HERE***  a (not good picture) of a rood with some hooks.

I thank all the help you gave me with your ideas and I will now get to work.

Once again, thank you all
Dias Costa

Edited By dcosta on 18/08/2015 22:24:51

18/08/2015 11:28:56
Hello all,

I'm doing three home kitchen bars for my kitchen and for this I have three stainless steel rods with 10mm diameter.

The longer rod is 950mm, the shorter measuring 450mm and third measuring 550mm.
I have to make a hole of 5mm at each end of the three rods and both holes have to be parallel.
In the longer rod I have to make a third hole at 425mm from one end.
I want to make them in my milling machine BF20 whose table is 500mm long.
Can anyone help me telling me what to do to ensure parallelism of the holes?

Best regards
Dias Costa

Thread: Arduino, Genuino ... or what Clone ?
08/08/2015 15:09:18

Hello Michael Giligan, good afternoon.

Have you noticed there's another, recent, member of the Arduino family (Arduino Yún) with two processors (ATmega32u4 and Atheros). The first is the usual the second runs a Linux distribution.And the Arduino processor can comunicate with the Linux processor which opens a new world of possibilities...
See ***HERE*** , please.

Dias Costa

Thread: Number series drills - history and origins
06/08/2015 00:51:24

Hello all,

Between Tim Stevens's message (22:39:57) and Clive's message (23:12:45) more than 40 minutes have passed. It's a pity Clive didn't read Tim's message before he wrote his. If he did he could see that Tim wrote 'Vandal' and in the very same dictionary Clive cites in the link, in the second entry, he could have seen (Vandal) A member of a Germanic people that ravaged Gaul, Spain, Rome (455), and North Africa in the 4th-5th centuries.

Dias Costa


Edited By dcosta on 06/08/2015 00:53:56

Thread: Lathe shocks
02/08/2015 19:20:46

Hello Nitai,

Look ***HERE***, please. Maybe a traveler adaptor like this prevents scrificing the plug...

WA-14 Travel Plug Adapter for Israel, Palestine ("Type H" SI 32, Round Pins)

Dias Costa

Thread: Universal bender
11/07/2015 23:14:03

Hello all,

Does anyone know if I can make a hook like the one in the picture with the Universal bender in **arceurotrade** ?

Diameters are 10mm and 25mm.
Material stainless steel 3mm.

Thanks in advance
Dias Costa


Edited By dcosta on 11/07/2015 23:17:27

Thread: ratchet press
10/06/2015 12:15:06

I saw presses like the one in the previous post, used to close / open floodgates of small dams for irrigation of crop fields.

Dias Costa
Thread: What did you do today (2015)
06/05/2015 11:35:54

Hello Michael Cox.

Thank you for your help.
Had no luck with Continente.

Best regards
Dias Costa

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

Support Our Partners
Allendale Electronics
Eccentric July 5 2018
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