Member postings for Terryd

Ady,

As someone earlier pointed out, lathes should be set up to face fractionally concave in order that mating surfaces do not rock. sometimes 'flat' is not a good idea.  I understand that on Myfords the carriage is set to face concave by 0.001" in 12", so in the 3.5" Max Radius on the lathe  the concavity would be in the region of 0.0003".

Regards

Terry

Edited By Terryd on 25/10/2012 11:19:03

Hi Mike,

That would be very nice but unfortunately they are not working models, at least as far as the engines are concerned.

Regards

Terry

Hi Ady,

Something costing 75p in 1971 would cost just over £8.00 today.

Best regards

Terry

Wouldn't it be just our luck to get to that new planet just before it was struck by the astereoid

Best regards

Terry

I know that the Spitfire has a great following and this is great news, but to say that it won the Battle of Britain is a bit of romantic exaggeration. It was the Hawker Hurricane which played the greatest part in winning the battle. The RAF had 32 HH squadrons compared with 19 Spitfire squadrons. It was also reputed to be the most versatile of the single seater warplanes to come out of WW2 as it could be adapted for many uses.

Regards

Terry

Edited By Terryd on 24/10/2012 15:41:25

Hi Steve,

Animals are known to make limited use of tools such as you mention but it is strictly a single use. The hammer as opposed to a stone is a deliberately fashioned and constructed versatile tool. For the first time a poorly equipped relatively defensive ape, i.e. early man could easily kill other animals instead of scavaging the left overs from other hunters or harvesting roots and seeds. They could defend themselves. The hammer could be used to smash open the tough hide of animals and break bones to release the nourishing marrow.  The hammer could be used to make other tools in the same way that the lathe did in the industrial revolution - no blackbird does that.  He sees the stone as an anvil and nothing more.

It is thought that the increase in meat content of the early man's diet was a major factor in increasing brain size and capacity because of the high protein content.

This is my post No 1666 so I should mention The Great Fire of London!

Best regards

Terry

Edited By Terryd on 24/10/2012 11:57:45

Nice one Jason,

I see that they sell studs as well - that's one to bookmark

Best regards

Terry

Hi Chris,

You can actually do a lot of milling work without a vice. Harold Halls book on milling ('Milling A Complete Course' shows many examples of accurate work holding without using a vice. It's worth a read and may get you started on some useful projects to ease you into your new machine while you are saving your pocket money for a new vice.

I would say now that I only use my vice for about 20% of my work (mostly drilling amd reaming) and could probably get away with more. I'm not saying that a vice is not necessary, it is, but just that you can do a lot without. A vice does introduce another variable with the posibility of innaccuracy but by clamping work directly to the bed when possible can help to ensure accuracy.

By the way, a lot of the problems with jaw lifting can be overcome in many cases (again not all) by using a round bar between the moving jaw and the work. I keep a precision roller from an old photocopier for that purpose.

Best regards

Terry

A good place to start - Volume 202, issue 4350, page 522.

Regards

Terry

Thanks Chris,

I'll heed your warning. I do understand the brittleness of Carbide and one of my cutters which I was going to try is a fast helix ripping type so I may be ok. It is just for experimental purposes really. I did get the idea from your earlier postings and thought that i would try. I am very cautios beleive me, overly so some would say but I will keep your remarks in mind and take small cuts. I'm treating the cutter as disposable and at 99p can afford it - just.

Best regards

Terry

Thanks,

I had forgotten that trick. the lads at the sailing club I used to belong to disposed of several inconveniently placed trees with copper nails!

Best regards

T

Hi all,

Back to the thread - sorry . I have just had my memory jogged and I think that in modern times one of the greates mechanical inventions, rather an evolution, was the safety bicycle. It came about around 1885 and within 10 years had revolutionised personal transport and industry

For those who don't know, the 'Safety Bicycle' was the forerunner of our modern bicycle with a crank and chain drive, trapezoidal tubular frame, pneumatic tyres brakes and steering. It was designed and made by J K Starley in Coventry. Previously bicycles and tricycles (mostly for women) were heavy, cumbersome and very expensive and some were very dangerous - the penny farthing, or 'Ordinary' was a deathtrap. until the Rover 'safety' ait was called a bicycle was way outside the means of an ordinary man or woman.

This invention led to quite significant social change. For the first time individual transport was available and men could get work at more distance than they could walk which meant more opportunity. Men and women could enjoy more leisure and get away from drab surroundings into the countryside.

Quote:-

"Even as the public eagerly awaited affordable automobiles, it rightly regarded the safety bicycle as one of the great technical and social contributions of the Victorian age. And although the humble bicycle would never again rule the road as it had in the last quarter of the nineteenth century, it offered new and compelling opportunities for technical and commercial development."

History of The Bicycle -2004 by David V. Herlihy

This picture from 1894 shows how fast the technology had developed:

Regards

Terry

Hi Bob,

I'm with you on this one. That is how I read your initial posting. My point was that I don't really care about this lad, his dad or his money. That's the way of the world, but I don't want to spend my meagre pension to read about him in a magazine. If I want to read such articles I would buy one of those celeb magazines. It belonged more in 'Hello' magazine than one about practical model engineering.

Best regards

Terry

Hi Merlin,

That was my point exactly but some folk read what they want to see, rather than what is actually written. I didn't demand perfect spelling or absolutely accurate grammar. All I argued for was reasonably well spelled postings with punctuation - using full stops and commas in approximately the right places to make for easy reading and understanding. Not a lot to ask.

Of course the snipers see what they want to and and simply show their own lack of understanding. It rather reminds me of that line from Simon and Garfunkel:

"People hearing without listening"

Best regards

Terry

Hi Neil,

It is a simple variant of dyslexic, which is the root. The original is dyslexic of which the word in question is a derivative.

Best regars

T

Hi Michael,

I would have thought revolution was more likely. How many times have we seen ancient developments which have come to a dead end and then re-emerge when the need and technology allows. It is obvious that the Chinese developed the differential mechanism but it didn't develop until it was re 'invented' when the need arose in the motor car. I see the same with the Antikythera mechanism, there was no reason that the Greeks, if they were this capable could surely have made clocks if there was a need and if they had (or could develop) the technology to make springs or other means of storing the necessary energy.

Perhaps there are universal principles which emerge as need and technology coincide to demand their development into useful devices, and this repeats itself through history in different contexts and different technologies. Thinking of this brings to mind the iPad and Android devices which use gyroscopic effects to sense movement and positiion in a tiny hand held device. Mankind is indeed ingenious.

Best regards

Terry

Edited By Terryd on 21/10/2012 13:05:23

Hi Bazyle,

I think it impressive just to get 33" square in his lathe, mine won't allow more than 1" square through the mandrel

Mind you, I used to have a 12" but didn't use it as a rule

Regards

Terry

Edited By Terryd on 21/10/2012 13:06:31

Norman, 

I don't really like wine but it is so cheap in France I just Have to bring it back in bulk!

T

Edited By Terryd on 21/10/2012 12:37:53

Edited By Terryd on 21/10/2012 12:41:23

P.S. It was because of such experiences with teachers that I later thought I could do better and retrained. I think that I have been reasonably successful in that respect and I still get ex students stopping me in the street and thanking me for the help and inspiration I gave them. I find that experience as rewarding as anything in my previous Engineering career.

Regards

Terry

Hi,

When I had access to M300 before I had my own kit, I used a 3 jaw jacobs drill chuck (with drawbar and adapter) in place of the large 3 jaw self centering for very small stuff. I found it quite accurate. and it is no harder to turn small stuff on the larger lathe. in fact being so rigid it tends to be easier to use. It is often said that it is possible to make small stuff on a large machine rather than visa versa. (wouldn't like to try watchmaking on it though).

Best regards

Terry

Edited By Terryd on 21/10/2012 12:29:48