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Member postings for Clive Hartland

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

Thread: Best Steel Type for a Toolpost
24/08/2011 14:55:50
If for modelling use i would use the EN1A, but if for serious production and continuous work then the tool steel.
15mm of M6 thread has a tensile of about 2000lb so I doubt it will strip? Its governed by the screw itself.
The EN1A will machine easier as it is free cutting with lead in the steel. It just wont weld!
Thread: Small Steel Boilers
23/08/2011 17:15:24
The only de-zincification of brass I ever came across was in Rifle cartridges, this usually occurs over long periods of storage.
When found the whole 'lot' are condemned.
The de-zincification causes the cases to seperate when fired and can leave the bell mouth of the case stuck in the breech.
It usually shows visually as a dark discolouration on the outside of the case but often only happens when fired.
I do believe sulphur in the water can also start de-zincification of brass parts.
Thread: Nemetts 15cc engine
23/08/2011 15:00:30
I wonder if there would be interest in the model engineer fraternity for a project to make an engine from stock bar and square ally?
Something easily machined and minimum set ups, fabricated crankshaft etc.
Some of the designs I have seen are out dated and look old fashioned.
Has anyone any good designs to offer?
Thread: Old Oxygen Bottles Use
23/08/2011 14:55:00
Some years back I used to buy Nitrogen to purge the optical instruments and we had to set up a rental system and then we payed just for the gas. Empty bottle and money for the full bottle.
Now I understand that if you have Oxy/Acet. kit you have to have special storage facilities and again it is a rental system.
The storage facilities are made to be remote from working spaces and free to air so that gas escapes are dissapated without danger. I also believe the Fire Brigade do a check and keep record of the facility in case of an incident. It may not be you but an adjacent place that causes the problem.
Again BOC would want a contract and their bottles have a colour coded test plate attached around the collar which identifies their bottles and they will only replace their own kit.
I dont think that you will be able to use it in a domestic situation such as a house garage or garden shed as there are regulations existing about such things.
Beware H&S from the Council!
Regarding a good use for the Oxy. bottle is to turn it into a safe. Cut a groove inside the edge and make a lid that is below the edge so it cannot be levered out. Find a good five or even six lever lock and make a three stud lock to fit the groove in the body.
I have done this, I used the last 20" from the bottom and drilled through the base to fix it to a wall or floor.
Other than that I cannot think of any other use at all!
Thread: Plumber's grease
23/08/2011 14:30:01
PTFE is an interesting lubricant, it is what I call, 'Gap Filling'.
It replaces dirt and fills the microscopic pores of the metal and ensures permanent lubrication.
It is available suspended in a thin oil and as a grease.
The name TRI-Flow is the name it is sold under.
I have often used it when cleaning and lubricating guns and a later inspection shows it has wicked out the dirt from joints and seams.
I have also used it in an engine as an additive and it quietens it down and it seems to run 'Freer'.
Perhaps a minute application of ptfe might be a good way to go!
21/08/2011 21:29:42
Someone once told me that the best oil is made from the jaws of Porpoises?
Myself, I use a three pack of oil graded by colour and viscosity which has always proved to be very good when I have used it on clocks and camera shutter delays.
Thread: end mills, how many flutes?
21/08/2011 21:25:44
Perhaps I drive them too hard, I now use a smaller dia. cutter first and then follow with the right size so problem solved.
I have a selection of 3 flute carbide cutters and they have slow helix flutes and I find these superior to the HSS cutters for most of what I do as they will cut much tougher steel than the HSS cutters.
They cost more and are because of the three flutes harder to re-grind but I have made collets with special markings for use on the Worden which does a good job on them with the diamond wheel.
Thread: Plumber's grease
21/08/2011 16:27:22
Some of this Plumbers grease is Silicone based, so bear that in mind.
Some of the older stuff might be Lithium based.
I think I would go for a modern grease such as KWIL's suggestion.
Thread: end mills, how many flutes?
21/08/2011 16:18:05
This all depends on what you are cutting, side cutting or slots.
Two flutes will cut just fine but if cutting slots then it will sometimes cut oversize. With four or more flutes the cuts are balanced on both sides of the cut and it does give a better finish.
most cutters now have 3deg. clearance on the cutting lip so they are adequate for most materiels.
Carbon steel endmills must be a rarity now as with CNC grinding High Speed steel is the norm.
Carbide endmills with 3 flutes give a very good finish but unless you are into production scales then not worth it.
Stick to high Speed steel cutters with 4 flutes and hold 2 flute cutters if you want to plunge cut.
Thread: Turning
18/08/2011 20:46:34
Just had a look at Masiemore (Bees) and they have egg manipulating tools. Stainless steel at £11.50.
18/08/2011 20:43:16
Mark, Thornes are offering a few tools for egg manipulation and they seem reasonably priced, but if the sizing is not right then you should try to make your own!
I think the welding wire (stainless steel) is 0.8mm dia.
I dont think you can heat treat the stainless steel to work on it but I have at times using two abrasive stones face to face with the wire inbetween reduced the dia.
(This was for making 'Prickers' for diesel engine injectors)
All you can do is have a try at it.
18/08/2011 17:02:34
Being a beekeeper this interests me, I think you are making it far too complicated Mark.
Simpler would be to get some stainless steel wire of the size and insert it into a suitable handle iether plastic or even hardwood.
You can then do what you want to do with the free end of the wire, making it into a spatular or cup.
Preserving the integrity of the bee egg is vital as is the time taken to manipulate.
Someone will come up with a source of the stainless steel wire which will be quite stiff even at 0.5mm dia.
Thread: What is the purpose of centre drill and how does it work?
14/08/2011 15:13:24
There are two types of centre drill, one with the straight conical form and the other has a curve in the that position.
The second type is used as a support when turning a piece of metal that is off center to the chuck center.
The curve allows contact all round the hole even though the tail stock is set over.
Most all lathe workers now own a running center, which no longer require grease or oil lube when working.
Thread: Why is it so hard to find materials in the UK?
14/08/2011 10:01:14
Thats why every engineer keeps a scrap bin on the off chance he will need a specific piece of metal.
I think its being called being a 'Magpie', sheds full of useful junk!
13/08/2011 14:10:21
For some time the foriegn products have been a bit suspect.
My son works for an Underwater Gas and Oil exploration company and sources materiel and finished items from many sources.
Some stainless steel pipe and elbows were fitted into the high pressure air system in an engine room and subsequently and elbow exploded, luckily no one was injured as my son had just left the engine room!
The investigation returned the fact that the source of the elbows was from an unknown source and they were all suspect even though a certificate of conformation had been issued!
Another example was a Stainless steel 'U' shackle rated at 7 tonne which sheared showing crystalline fracture. Again from an unknown source with again a certificate of conformation on it.
This has made my son very careful where the suppliers get their goods from.
It was surmised they were from Chinese sources but they could not verify where they came from.
take care with imported materiel.
This brings to mind the tade in fake aircraft spares, all found to be lacking and dangereous.
Thread: Rust and how to remove it.
13/08/2011 13:59:41
If it does that to a mug what is it doing to your teeth?
Thread: Fine finish
12/08/2011 08:24:36
The fine finish on brass and other metals is called 'Graining'.
Its where the parts are polished with emery sticks whilst they are turning or Grained on the flat in long easy strokes.
Its an old method of making clock parts look nice.
The deep gold finish is done with 'Dragons Blood' a mixture of varnish and colouring dye. Some times the parts are heated while the varnish dries.
Thread: mini mills - which is the best?
09/08/2011 21:01:28
Perhaps Tim who started the thread could give us an idea of his price range to buy a machine.
Looking through what is available I am now looking at' Wabeco' machines.
Even thinking of going to the works in Austria to visit and look at what they have.
I think one might just fit in the back of my Estate car.
What do I tell the customs though?
Thread: Making Lathe Feedscrews
08/08/2011 09:07:50
I have seen some Lead screws where it appeared that the thread had been 'Rolled'.
The thread top having the appearance of a curled over lip.
Interesting if they cut the thread and then 'Rolled' it , this would give a higher Brinell hardness figure for the metal. Making it longer wearing than a normal cut surface.
Also it could be a method of straightening it.
Has anyone else seen this at all?
Thread: Char schneider 1:10 scale French Tank
06/08/2011 23:14:44
Interesting project, mostly made from Alu. fancy chopping bits out of the Tefal frying pan, wify would go spare. They are not cheap.
I notice his only machine is a power drill and it looks as if it is all hand worked, file and sweat!
Well done.
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