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

Member postings for CHARLES lipscombe

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

Thread: Coal being phased out
23/02/2020 09:29:05

To Mark Rand:

I would cheerfully bare my bum in public if I thought that would convince anyone to think instead of blindly accepting what they hear from "experts".

Unfortunately Mark's post is typical of the response of many climate change believers - denigration and insult of anyone who has an alternative point of view.

Maybe Mark follows the common belief that all scientists are to be trusted. After a lifetime as a scientist I can assure him they are not all purely disinterested men of science. As Paul Whitley said "it is very hard to get a man to tell the truth when his paycheck depends on it". If you want proof of this just look at standard ,legal practice where the defence and the prosecution field "experts" with opinions that suit their respective employers.

I repeat my assertion to Mark that it would be well-nigh impossible to get a university grant to discredit global warming - not for any logical reason, but because universities tend to be populated by radicals pushing their latest cause.

Chas

21/02/2020 22:54:53

I have deep reservations about much that is said and reported on global warming. The current and often left-wing attitude to anyone that does not believe in global warming is that you are not just wrong, you are bad as well. Just try getting university grant these days to produce evidence against global warming. On the other hand you could easily be forced out of your university job because you hold the "wrong" views

As a confirmed cynic I note that while there is great attention paid to saving the planet through getting rid of items like plastic cups but total silence on the destruction of the amazon forest and the indonesian/borneo rainforests. The amazon is said to produce 16% of the worlds oxygen - worth bothering about? Or is this aspect of global warming just too difficult to deal with?

A look at the world atlas reveals the whole global warming hoax - there are much bigger land areas in the north of the planet than in most of the areas now popular for human habitation. If the planet does warm to any great extent the human population will just migrate to what are currently the frozen north parts of the planet.

Chas

Thread: Villiers midget carb query
30/01/2020 20:32:56

Villiers were quite keen users of their own thread forms. Their later, larger carburetters incorporate a whole range of different standard threads e.g. BSF, BA, BSC as well as their own threads.

Chas

Thread: Broken Taps
27/12/2019 23:14:34

I tap quite a lot of stainless but restrict myself to 303 and 304 grades which are much easier to tap than 316.

What I have found is that HQS taps from the Tap and Die Co cut stainless very well, just as they are advertised to do. However they seem to be some form of carbon steel and do not cut for long before they go blunt. I have now abandoned these and gone to HSS only.

For tapping I use Trefolex for general purpose tapping, in the possibly mistaken belief that this is what everyone else uses. For screw-cutting in the lathe I use an American product, Tap Magic which works just as well as Trefolex but has the added advantage that being transparent it makes it easier to see what is going on.

I am surprised that people find WD 40 suitable for tapping, I would have thought that its constituents of Paraffin and fish oil would not provide enough lubrication, except for Aluminium.

Thread: Beginners models
09/12/2019 21:56:09

Following on from SOD's posting, there is a"Hybrid" way of holding work using collets that I learned from another thread some time ago. If you buy a Stevensons' collet block from ARC Trading, you can mount this in a 4-Jaw chuck and use collets to hold the work. This dodge has saved me hours when mounting repetitive jobs to run true.

Just one of the many things I have learned from the forum

Usual disclaimer re Arc Trading, Chas

Thread: Lathe lighting
06/12/2019 13:12:41

Bad luck for Noah if he was hoping his lathe and milling machine were going to breed and restock the world

Thread: Annealing Brass
02/12/2019 20:52:39

Success at lastsmiley

Following the tips given, I accomplished the job with no cracking. There was a very marked reduction in the amount of effort required to form the bend, which leads me to conclude that the new brass tube I purchased was well-and-truely age or stress hardened.

I stress relieved the bends by re-annealing afterwards because of the amount of displacement of the brass but I can see that this would be unnecessary for a cartridge case where little displacement of the metal occurs.

Thanks to everyone who contributed, Chas

02/12/2019 02:56:51

Thanks for that "Old Mart" . Googling seasonal cracking has revealed a need to anneal brass after the bending etc has been completed. I had not come across that before but it is quite likely to be needed in my application

01/12/2019 21:11:24

Ah! That's a much better response once I re-sited my requestsmiley

My thanks to everyone that replied and I conclude that cooling rate is not important for brass annealing.

A problem that arises with this job is well-known to old vehicle restorers - it has to look like the original so different methods e.g. fabrication are not always viable. The problem is more apparent on a restored motorcycle because just about all the parts required are visible. Both Clive and Diogenes' comments are the way I would like to go but.........

The consolation is that these articles were made well before WW2 and in mass-production so the job must be do-able and moreover easily done, or it would not have been carried out in mass production. "All" we have to do is solve the "how"

Regards, Chas

Thread: New to model engineering - what solder / flux and annealing question
01/12/2019 08:23:42

Hi Thor,

Thanks for your reply which I found very helpful. It seems that the rate of cooling of brass after annealing does not affect the properties of the annealed brass very much.

I have transferred my original posting to a new thread so maybe I will get more replies. Hopefully they won't be contradictorycryingI still need to know the temperature to use and maybe this will come up in further replies

P.S. I'm most impressed by your forum name. A nice piece of imaginative thinking smiley

Regards, Chas

Thread: Annealing Brass
01/12/2019 08:09:16

I think I shot myself in the foot with a previous enquiry on this subject by tacking it onto an existing thread which covered several subjects. The replies I got mainly concerned the other subjects as people referred to the OP's queries.So I am now trying again starting a new thread.

My question is:

What is the correct procedure for annealing brass? There is plenty of info on the webb but just about every piece of advice seems to be contradicted by the next article.

I am making some petrol filler necks for vintage motorcycles from CZ 26130 brass which is an arsenic containing cartridge brass.It is listed as good for cold working but only fair for hot working. I need to bend a small tab at right angles to the main axis and as-supplied tubing when bent cold, cracks on the outside of the bend. Wall thickness of the tube is 1.63 mms.

In particular, does the brass need cooling rapidly or slowly after heating?

Somehow I have a lot more confidence in the forum and its contributors than You-tubesmiley

Thread: New to model engineering - what solder / flux and annealing question
29/11/2019 02:30:49

What is the correct procedure for annealing brass? There is plenty of info on the webb but just about every piece of advice seems to be contradicted by the next article.

I am making some petrol filler necks for vintage motorcycles from CZ 26130 brass which is an arsenic containing cartridge brass.It is listed as good for cold working but only fair for hot working. I need to bend a small tab at right angles to the main axis and as-supplied tubing when bent cold, cracks on the outside of the bend. Wall thickness of the tube is 1.63 mms.

In particular, does the brass need cooling rapidly or slowly after heating?

Somehow I have a lot more confidence in the forum and its contributors than You-tubesmiley

Thread: Anyone know what is the protective plastic film on brass sheet made of?
23/11/2019 22:46:11

More realistically just put a piece of the film in water with a small amount of detergent. Only polythene and polypropylene have a density less than water and will float. All others will sink.

I would rate the chances of the film being PVC as virtually zero and the chances of harming yourself by burning a small piece of PVC also as virtually zero unless you do something moronically stupid, of course.

PVC is nowhere as common as it used to be, partly because it is a difficult material to recycle compared to PET and polythene. When it was widely used e.g. in transparent bottles I can't remember ever reading of any cases of people being poisoned by fumes of burning PVC unless the fire took place in a confined space e.g. an aircraft interior.

There is a definite place for personal safety in all we do but it is sensible also to beware of the hysterical over reaction so often promoted by the media.

Thread: Aero Fuel
30/09/2019 23:30:23

My thanks to all who replied with some very convincing answers to my question. Some of the replies that a pedant would regard as slightly off topic were just as fascinating to mesmiley

Cornish Jack: I don't know about the current situation but in the 80's Burma was always regarded as "history in motion"

Chas

29/09/2019 00:01:23

Having been castigated for going off topic re water in fuels (unjustly in my opinionsmiley) I will start a new thread....

In view of the increased power available from the use of methanol in high compression engines, does anyone know why WW2 aero engines stayed on petrol?

There may have been experimental jobs but I am thinking Hurricane, Spitfire etc

Chas

Thread: Water in fuel
28/09/2019 04:18:12

At long last I have been tempted to weigh in to the ethanol in petrol debate. The "problems" with ethanol fuel seem to have been greatly exaggerated to me. Australia has been using up to 10% ethanol in fuel for many years (10-15?).

In this time I have used it in three Toyotas dating from circa 1980 to 2000 plus in a variety of vintage and veteran motorcycles. I have never had the slightest problem from its use but the oldest Toyota runs a bit more smoothly on ethanol fuel, probably because of a rather poor state of tune.

More to the point is that I have never seen any reports of people having problems with ethanol fuel. Given the normal human tendency to knock anything new -it's not as good as what we used to have- I think it is safe to say that anyone using ethanol fuels is most unlikely to suffer any problems, despite theoretical disadvantages from possible water content and solvent power on fuel lines etc.

I don't include people who are using tank liners or fibreglass tanks in this comment. However being a very cold-intolerant person, my vintage bikes often sit for months in the winter and I have not noticed any rust formation in the tanks.

Maybe the dampness of the climate has an influence but there again I have never heard of problems from the tropical, monsoon area of Australia either

Chas

Thread: Solvent for degreasing engine, without damaging the paintwork?
14/09/2019 02:02:58

Naptha for all intents and purposes is white spirit. Whilst ethanol and isopropanol may not greatly affect the paintwork, they are not great solvents for oily residues either.Of the two, my money would be on iso-propanol. Paraffin as present in WD 40 might be an answer.

Odourless white spirit might also work, it has rather less solvency than the straight version.

Chas

Thread: To Pin or Not To Pin
13/09/2019 22:56:12

Clive Foster,

Your reference to the tapers holding on a Velocette but not on a Gold Star is very interesting but would you be prepared to speculate on why the Gold Star fitting is less satisfactory? Is the Velo set-up longer? Just idle curiosity on my partsmiley

Are you by any chance the son of the great Bob Foster of New Imperial TT fame? If so, we have corresponded ages ago re my using some photos for my book on New Imperials

Chas

Thread: Removing felt lining from wooden boxes......not animal hide glue.
04/08/2019 05:15:15

Brian,

No not correct. White spirit is wholly aliphatic but Mineral Turps is about 40% aromatic e.g. Xylene. For many products Mineral Turps is a much better solvent than White Spirit.

Shell used to market a solvent called X32 in Australia which is very close to white spirit. You might be able to buy true white spirit retail e.g from Bunnings.

Chas

Thread: RENAULT DAUPHINE
01/08/2019 03:20:15

Re postings on another thread:

Is my somewhat unreliable memory playing tricks on me? I always understood that the Renault Dauphine was something of a disaster of a motor car with a dangerously poor weight distribution at the front end. Certainly one place I worked at, one of our people was blocked off in the parking lot when he wanted to go out at lunchtime. The problem was solved by two not particularly hefty blokes picking up the front end of the Dauphine and moving it aside.

I also thought that the insurance companies had refused to insure Renault Dauphines after a while because they were a) unreasonably represented in accident figures due to the weight distribution b) prone to catastrophic rust problems that compromised safety.

Anyone remember this?

Chas

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

Latest Forum Posts
Support Our Partners
emcomachinetools
cowells
Eccentric July 5 2018
Warco
ChesterUK
Allendale Electronics
Ausee.com.au
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