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Member postings for Barrie Lever

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

Thread: Torx head variant or faulty batch?
21/08/2019 17:09:34
Posted by JasonB on 21/08/2019 16:05:32:
Posted by Barrie Lever on 21/08/2019 15:24:26:
Posted by Neil Wyatt on 21/08/2019 14:23:14:. Each province of China has a legally enforced minimum wage

Neil

(there is no Chinese National min wage as you mentioned)

Think you need to read it again Barrie, Neil did not mention a National minimum.

Can we now keep the talk to the subject of Torx

As someone who can often get through a 1000 screws in a week it is quite usual to have the odd duff one or two with either poor heads or plain shanks without the screw part being formed Seem to remember the same thing with old Nettlefold screws as now with screws that I don't know where they are made. I Just bin the duds and get on with it.

I will reply to you by PM

21/08/2019 15:24:26
Posted by Neil Wyatt on 21/08/2019 14:23:14:
Posted by not done it yet on 21/08/2019 10:30:12:

Torx head variant or faulty batch?

Not really a question, surely? Not even faulty. Just not Torx.

Has anyone else had a batch of these mongrel Torx heads?

I expect there are quite a few, but possibly not on here!

Can anyone suggest ...?

Just cheap chinese rubbish. No quality control. Slave labour production.

It is not the manufacturing that has gone awry. There will always be possible set-up errors, but they should not get palmed off to paying customers!

Care to give the origin (seller) so we all can be careful when making purchases?

NDIY, please think before you post.

No-one, except perhaps suppliers to aerospace projects, undertakes any more than sample quality control on fixings. Whether these came from China or Germany or anywhere else is irrelevant, any manufacturer of goods on the scale of small fasteners will end up sending out some rogue batches from time to time.

Comments alleging 'slave labour' are not very helpful either, especially from a citizen of country that itself has an estimated 13,000 people working under such conditions. Each province of China has a legally enforced minimum wage that is supposed to be at least 40% of the local average wage. Minimum wage is about 60% of the average wage in the UK.

Neil

Neil

I think you should read your own words with regard to your post !!

Good quality fixings are not the domain of aerospace, good manufacturers will have a super high percentage of their fixing product getting through with no faults. Modern manufacturing techniques and process control make this possible. I doubt that Unbrako would supply fixings in the state shown in the photo.

I am not sure where NDIY resides, probably the UK, there is no comparison between the average working conditions in the UK, EU, Japan or the USA compared to China. There are terrible factories in the west but there are way less of them per capita than in China.

Are you sure about the wage comparison figures? You are saying that the average minimum wage in China (there is no Chinese National min wage as you mentioned) is 60% of £28K which is the average wage in the UK. I think with red mist (no pun intended) that you wrote your post with that you got your numbers muddled up some where. As a matter of interest the average wage in Shanghai is above the UK average wage, but Shanghai is the wage leader in China.

Whilst NDIY was a bit blunt, what he said was correct.

B.

21/08/2019 12:06:24

Nick

I was referring to nothing more than NDIY's aspersions on the good nature of the Chinese people and the low end of their manufacturing supply chain !!

B.

21/08/2019 11:37:14

EGA

I think you are right, just that the 'Great Escape' is much more in the forefront of my mind.

B.

21/08/2019 10:50:02
Posted by not done it yet on 21/08/2019 10:30:12:

Just cheap chinese rubbish. No quality control. Slave labour production.

Blimey NDIY

You cannot say that sort of thing around here, even if it is true.

Cooler for you !!

B.

21/08/2019 08:17:07
Posted by Jeff Dayman on 21/08/2019 02:02:23:

The right side one looks like "the recess formerly known as Torx" laugh

Could be bad or worn tooling, could be a China oddity, could be a new and better thing....er.....

I'd be a whole lot happier with them if they looked like the left one or better yet were a straight hex socket.

I hate trying to deal with rusty Torx sockets on cars and other machines. Just my $0.02 worth. Ready and waiting to be slammed as usual by the armchair experts.

Jeff

How is a hex better under any circumstance than a Torx?

I would like to understand your problems with Torx.

From my armchair.

Barrie

Thread: Piston/Cylinder Materials
20/08/2019 22:42:55
Posted by Steve Crow on 20/08/2019 18:35:24:

I'm planning to make a small air powered piston engine. It's going to be 6mm bore and stroke. I'm not expecting it do any real work, just a demonstration project.

The cylinder will have an inner sleeve, plain, no ports or anything. I'm hoping to keep the walls thin, 7mm OD if possible.

The piston will be plain with no rings.

My question is, what are the best combination of materials for these?

I would like the piston to be silver steel as I can use 6mm stock and make a D-bit from the same to bore/ream the cylinder sleeve.

Should the sleeve be bronze or would brass do?

Would I be better off with an EN1A sleeve with the piston brass or bronze?

I take it that steel on steel is a no-no. I would rather not use cast but if it was advantageous I'd give it a try.

Has anyone built one on a similar scale? Or possible a Gasparin style Co2?

Cheers, Steve

Edited By Steve Crow on 20/08/2019 18:36:08

Steve

An engine just like shown below.

dsc_0639.jpg1/4"bore with a brass piston running in an aluminium cylinder. This was built by my late father about 45 years ago, I last ran it in 2011.'

Ideally it should have a prop not a flywheel as it runs away with it self, I thought it would throw the rod last time I ran it.

If you want any measurements or details I will try and get them off the engine, there are no drawings though.

regards Barrie

Edited By Barrie Lever on 20/08/2019 22:43:32

Thread: my knowledge of steel needs improving
20/08/2019 17:56:58
Posted by Andrew Johnston on 20/08/2019 16:25:43:

Rollocks, I've just lost what I was typing. I'm not going to retype as SoD seems to have covered most of what I'd said. We can summarise as follows:

  • Steel specifications are a mess and different systems have no exact equivalence
  • For the purposes of making a clock it doesn't really matter if the exact steel isn't used, a rough equivalent wiil be fine
  • Silver steel and gauge plate are sold in the UK as such and are roughly equivalent to W1 and O1

To be pedantic EN19 is not a high carbon steel; it's a medium carbon high tensile alloy steel. The principal alloying elements are manganese, chromium and molybdenum. The steel is also easily welded and the original 4130 specification is know as moly-chrome steel. In tube form it is widely used for welded tubular structures for aircarft and racing cars.

These people have useful datasheets on steel:

**LINK**

Andrew

Andrew

Good to see you back.

Barrie

Thread: Grinding your own lathe cutters
17/08/2019 10:48:24

Chris

If you want to borrow the book then send me via PM your address details.

Take a look at the reviews of the book on Amazon.

https://www.amazon.com/Tabletop-Machining-Joe-Martin/dp/0966543300#customerReviews

The book really is a bible for Sherline owners.

You will not fall out with me over a book.

Best Regards

Barrie

17/08/2019 09:56:09

Chris

You really should get yourself a copy of the book written by Joe Martin who was the owner and real driving force behind Sherline, although not the creator.

The book is called 'Tabletop Machining' ISBN 0-9665433-0-0 and covers exactly the points you ask.

The book is a complete inspiration on using small machines.

I visited the Sherline factory about 6 years ago, they make a superb product that punches way above it's weight.

If you are going to buy the book, you can borrow my copy until yours arrives.

Regards

Barrie

Thread: Digital calipers made in same factory?
16/08/2019 11:06:25

Dave

I will not take your bet on the survival of the CE marking because I think you are right.

I am not in favour of an easy ride for manufacturers or importers, rather I would like to see higher standards imposed.

I know from experience this just drives the quality up exponentially.

Regards

Barrie

16/08/2019 10:13:26
Posted by Michael Gilligan on 16/08/2019 09:41:29:

Posted by SillyOldDuffer on 16/08/2019 09:03:03:

[ ... ]

Anyone ever seen a European CE mark that was faked?

.

I honestly wouldn't know, Dave

All the ones I have seen looked real enough ... but I suppose that's where lies the skill of fakery.

angel MichaelG.

.

Edit: These must be getting pretty close:

**LINK**

Edited By Michael Gilligan on 16/08/2019 09:57:54

Michael

Thanks for that information, it just confirms the worst suspicions about CE marking, it is not worth the ink it is printed with.

Best Regards

Barrie

16/08/2019 10:10:31

Dave

90% of CE marked products are self certified.

Do you really think that the mass of goods coming in from China and made by small Chinese companies have been certified in the EU? of course not, that is why they created 'China Export'.

How on earth are the Japanese and Americans getting all of their expensive medical equipment into the EU? well it is the same way that the UK will do when we are out, we will just follow the rules and get the equipment certified.

I stand by the argument that there is no point in a marking system that has no traceability.

We are so far apart on this that we really should call it a day and get back to making swarf !!

Regards

Barrie

16/08/2019 08:14:18

UL enhanced explained

https://www.ul.com/news/qa-uls-enhanced-certification-mark

Seems more complete than CE.

B.

15/08/2019 21:49:38

Dave

You really don't know what you are talking about regarding CE marking, as Robert has said the great majority of products are self certified.

The very clear difference between CE and UL/CSA is that the latter have to be submitted to the test house.

Check out the following and get back to me if I need to issue you an apology !!

https://cemarking.net/ce-self-certification/

https://www.conformance.co.uk/ce-marking-for-products/ce-marking-basic-information#what-can-i-do-myself

CE marking is not worth the small amount of ink used to print the label.

The system needs to be independently verified with a unique ID for each product, then it would have some value, like I say, where there is a will there is a way.

Regards

Barrie

15/08/2019 15:21:20

Dave

My comments about faked CE markings are true and I would be prepared to discuss and share with you via PM if you desire.

As for a marking system that has more chance of working, how about the UL enhanced system? where each item has a unique identifier, this ID could then be checked back to a UL database to stop some dishonest person or company copying an identifier in addition to copying the product.

For whatever reason, there is no will to sort out the CE marking system, my hunch is that whilst the bureaucrat's know the system does not work but they don't want to admit defeat.

Where there is a will there is a way.

Ian

I like the thread locker image.

Regards

Barrie

15/08/2019 12:17:56

Ian

I agree the CE mark is an absolute joke.

I have heard of dodgy approval houses producing certificates that fool genuine retail customers into thinking that the item is approved and tested to the required standard, when in actual fact they have just rubber stamped the product and have no way of actually testing to the required standard.

Incorrect CE letter spacing is the least of the worries.

I am not sure if we will wash our hands of that failure on the 31st or not?

Barrie

Thread: 4 stroking a Merco 61...
14/08/2019 21:15:27

Martin

Do the 4 stroke engines like OS use a brass liner, that is normally a 2 stroke thing in combination with a ringless aluminium piston.

Go the CI route, there is a lot of other stuff to sort out in the project with out looking for extra work.

Regards

Barrie

14/08/2019 08:02:44

Martin

You will certainly need to make a new liner, you might be able to reuse the piston after removing the piston crown baffle.

For this project to work you will need some fairly creative ideas. You will certainly need to do some cross slide milling.

Jason

The rotary valve layout might save on making a crankshaft as well, I think it might be possible to pick up drive for the belt from the crankpin by getting a hole into the pin and pressing a drive peg into the hole.

Regards

Barrie

13/08/2019 23:23:55

Martin

Given the restriction of having no true milling facilities, how about taking a look at the layout of the Webra 4T 40, I think that might be a bit more lathe friendly.

Drive the rotary valve from something that goes into replace the old backplate.

I think there is quite a lot of work converting the Merco's and it will always have the exhaust stack in place.

How about doing a Vega, they ran sweetly as I remember.

Regards

Barrie

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