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Member postings for Martin W

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

Thread: WM16 DRO cheap
26/07/2019 15:23:00

Ron

Tried to ring you earlier but you seem to be out/in the workshop/kipping on the sofa. Could be interested in the scales if you still have them.

Martin

Wroxham variety

Thread: Metal de-coroder
28/06/2019 14:49:08

A further bit of digital digging has shown that chelation is a very specific process where a large molecule will form at least two bonds to a metal ion. One definition found is :

  • A chelate is a chemical compound composed of a metal ion and a chelating agent. A chelating agent is a substance whose molecules can form several bonds to a single metal ion. In other words, a chelating agent is a multidentate ligand.

Also an entry can be found in Wikipedia here . There are many other descriptions of chelation but they all describe the same process

Hope this helps.

Martin

26/06/2019 11:14:42

Just been rummaging around on the web and found a list of sequestering/chelating agents, see below.

"The main types of commercial sequestering agents are:

  • Aminocarboxylic acid base products
  • Phosphates and phosphonates
  • Hydroxy carboxylates
  • Polyacrylates
  • Sugar acrylates"

The last entry might explain why molasses works as a de-rusting agent. I have looked but as yet have not located a complete list of compounds found in molasses. It could be that it does contain 'Sugar Acrylates' but there again I may be barking up the wrong tree, again blush.

 

Martin

edit.  another quote from the web.

"Molasses owes its properties to cyclic hydroxamic acids which are powerful chelators of iron. More of these compounds are found if the molasses is derived from sugar beet rather than cane sugar. The plants from which molasses is made presumably use these chelating agents to help them extract minerals from the soil."

So maybe the sugar acrylates aren't the main agent. Must check the trees before barking frown.

Edited By Martin W on 26/06/2019 11:43:36

Edited By Martin W on 26/06/2019 11:48:10

Thread: Telephone / Internet Scams
10/06/2019 13:42:36

This morning my wife answered the phone to be greeted by someone, a male, who claimed to be a police officer. The conversation went along the lines of, 'Sorry to disturb you but are you xyz etc., which of course was correct, as any fool could find that data on the net if they wanted. He then went on to say that 'We have arrested some people in London and found in their possession a VISA credit card in your name'. My good lady being pretty streetwise asked, before entering into any conversation with aforementioned "officer", to identify which bank/building society the card had been issued by.

This proved too much for "said officer" who immediately hung up. What amazed me is that he didn't just reel off a high street bank as a wild shot; not the brightest con artiste out there evidently.

So be warned they may start to smarten up their act, but knowing my good lady they will meet a brick wall when it comes to her supplying any important data; still sharp at 70 plus.

Martin

Thread: What are you using for Lathe Way Oil?
03/06/2019 01:39:08

I oil when the slideways start to lose their film of oil and use Mobil Vactra No 2 Slideway oil. To date the beds have never shown any signs of rust/corrosion and a litre lasts for well over a year.

Martin

Thread: What do YOU call it?
22/05/2019 19:48:37

Just Modging About or Furgling Around, often while like others I try to remember why came to the workshop and should I have a revelation then trying to remember where the required tool/item is. The latter rarely happens and if it does then reason for looking has vanished into the unfathomable mists of forgetfulness in the remote corners of my brain.

Thread: North West 200 coverage
14/05/2019 09:45:41

Magpie

I have never heard the expression 'circuits round the sun' but for me it puts a perspective to time that I hadn't thought of before. Thanks.

Perhaps I should get out more while I have a few circuits left wink 2 having run up a mere 75.

Cheers

Thread: Anglepoise Lamps & CFL/LED lamps
07/05/2019 16:37:06

Peter

You can get get LED bulbs that are practically identical to the old incandescent bulbs in weight and looks, like these, which in warm white is not tiring on the eyes as the whiter varieties can be.

Cheers

Martin

Thread: Changing Broadband
12/04/2019 00:51:23

Well I have got Virgin cabled broadband and in general I have found it fast and reliable. On the odd occasion when there has been a fault I have always managed to get to get through to a 'representative' within a few minutes albeit in India or similar and they have always been extremely helpful. On one call where they couldn't help I was transferred to a UK engineer who was brilliant. I have always been polite and friendly and have invariably had the problem resolved. I wouldn't consider changing to any other provider and NO I don't have any connection, electronic types excluded, to the supplier other than being a very satisfied customer.

Credit where credit is due.

MartinW

Thread: LED replacement bulbs
09/04/2019 20:12:00

Chris

While it won't work on all LEDs I have got round the problem of using a mix of incandescent and LED bulbs on the same circuit. The average dimmer needs some form of load to operate correctly and this can be obtained from the incandescent lamps. My solution was to fit an even number of LED to incandescent lamps, we have 6 bulb ceiling fittings so it is 3 of each alternating. It has an interesting effect as when the lights are dimmed the incandescent lamps turn, as expected, much more red while the LEDs just dim while maintaining their colour, again as expected. The mix of lights tends to give a better less warm light when they are dimmed than incandescents on their own.

Cheers

MartinW

Thread: Soft Feel Finish on Radio
03/04/2019 11:26:12

Isopropyl Alcohol can be bought from CPC (Farnell) in either 400ml aerosols or 1lt cans. I always have some around for general cleaning as it leaves a smear free finish and does not attack most plastics though it will affect some paints. It's also good for removing emulsion paint after it has dried, as is methylated spirits, which it useful for cleaning those bits you didn't really mean to paint.

MartinW

Thread: Turning over a new Leaf
25/03/2019 19:48:47

John

Welcome to the madhouse that said there are a whole pile of people on here who will be only too pleased to give you sound and valuable advice. I know that there will be interest in your pictures and videos and once here they could well be of benefit to others.

Cheers

MartinW

Thread: Mini lathe
25/03/2019 00:53:17

Hi

If the speed control board drives a similar motor with no problems then the problem is the motor. I take it you are using a Digital Multimeter to measure the volts across the motor and this can give erroneous readings when measuring switched waveforms, even the so called true RMS meters as they are limited to a range of form factors (waveform shapes). If the motor is not running smoothly then as Neil suggested it could be the brushes or the motor connections to the brushes, shorted turns on the armature, carbon build up around the brushes causing tracking to earth. As I said above If the electronics drive another similar motor without any problems then the fault is with the motor.

HTH

MartinW

Thread: Smoke detectors
24/03/2019 11:22:12

Hi

The domestic smoke detectors I have running and those which have been replaced are/were all 'ionization' devices. The one near the kitchen had an override as it will activate from fumes from the cooker grill/oven when there is no smoke in the air. That said I haven't checked on the latest domestic alarms to see if they have changed the type of sensor used.

MartinW

PS

Just checked the Screwfix site and they are now offering a full range of detectors including heat and smoke combined. Tomorrow I will purchase a couple, offered in pairs, to fit near the kitchen or even have one in the kitchen. Thanks for the heads up.

Edited By Martin W on 24/03/2019 11:32:18

Thread: 24v dc motor powering a drill press
22/03/2019 01:24:40

Hi

There is no need for a transformer as you can buy switched mode power supplies here. They have 24V DC units with output currents that will easily meet the 11A input current for under £30, a 24V 20A DC smps is listed at £28-99p postage included. All that is then required is a speed controller that can handle 20A or so and the jobs done. No need to try and build your own and spend a fortune on large transformers, bridge rectifiers, capacitors and a suitable case to hold it all. Just 2 relatively small units that can be mounted in a smallish enclosure.

HTH

Martin

A suitable speed controller can be found here

Edited By Martin W on 22/03/2019 01:29:19

Thread: Brazing after milling whilst preserving accuracy
26/02/2019 10:20:41

Bill

You say that the type holder is subjected to repeated heating and pressure cycles. I take it that this happens when tools are used to fix the gold leaf or substitute on the book covers/spines, what is the typical temperature that the print holder is heated for this transfer process? I assume that for the smaller type holders the pressure is only applied by hand and not in some form of mechanical press. The reason I ask this is that Ian has suggested the use of adhesives and these could fail if the tool working temperature is high.

MartinW

Thread: Pitched aluminium rings. Any ideas how to machine them?
04/02/2019 18:46:54

Hi

Just printed out one of the photos showing the bezel ring edge on and measured the angle of the bezel to the base and this gives an included angle of 22.5 deg. Before anyone jumps up and down I know that this is not the way determine the 'true' angle on the bezel. I think that SOD by offsetting the top slide by 20 deg actually cut an included angle of 70 deg rather than 27 deg and this would account for SOD's bezel looking very different from the pictures. That said Dave clearly illustrates one method of producing the particular part on a lathe which is what Christopher wanted which was the point.

Cheers

Martin W

Thread: Is it a drone?
04/02/2019 11:50:41

They are already being used at airports to scare other birds away, not a in seagull form but as a mock peregrine falcon that perfectly mimics the falcon's flight, glide and attack characteristics. A brief clip can be seen here.

Martin W

Thread: Spring Calculation
02/02/2019 12:23:46

Wasn't there an article in MEW sometime ago about springs, spring winding and calculations for achieving the required force, or have my grey cells finally petered out ?

Thread: Proxxon MF70 went bang
01/02/2019 01:08:18

Emgee

Not at all in fact it was FF's comment regarding and I quote, "Amidst all the electronic experts here, this will be inviting ridicule but...."

With regard to your posting I agree that using a neon indicator severely limits any meaningful tests being performed. However if this is all Bill has then use can be made of it to see if the mains supply is reaching the mill and whether physical switches are working. It may also be possible to identify, on the live side of the circuit, where there is a break i.e. Dave suggested that one of the inductors may have failed and it could be possible to identify a fault of this nature using a neon based tester. It's a case of using what is at hand to help eliminate or confirm any problems.

Hope this puts your mind to rest.

Martin W

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