The Hot Metal Ezine.
The International Hobby Metal Casting ezine.
Brought To You By:
Col Croucher, administrator of: www.myhomefoundry.com
Australia.
 
  Februray 2007. Volume: 04. Number:40.
40th Anniversary Edition.
G'day.
Welcome to edition number 40 of the Hot Metal Ezine. I hope your projects have been rolling a long the way you wish them to be. I don't know about you but Murphy law seems to have frequent visits every now and again, you begin to wonder is it "just me", or was it the way that I approached the project that made things go wrong, sometimes it appears that no matter what you do, things don't pan out the way you want them to.

You may have read in past issues where I have mentioned Burt Munro the great motorcycle speed legend from New Zealand, the film tells a fabulous story, but as it turned out, through one thing and another, I was offered the book about Burt Munro to read by Neil Robertson from Invercargill New Zealand, (Burts home town) I have hardly been able to put the book down since it arrived in the mail, what a story it is, I don't think I have ever read a story like this about someone who suffered from so many setbacks such as Burt did with his speed attempts with his beloved 1920 Indian Scout, he was blessed with a dogged determination to succeed no matter what it took, when major engine blow ups occurred he virtually shrugged it of without too much fuss and then set about to rebuild an ever more reliable engine, if you think you've had a bad day or two in your life, then you should try to get the book and read it, it could change the way you think about things when Murphy's Law comes to visit, i.e. when things go wrong.

If you enjoy reading interesting stories about how people achieved the almost unobtainable, you will enjoy the story about Burt, I've seen the film "The Worlds Fastest Indian", a fantastic film it is, but the book reveals so much more about the man and his incredible speed machine.

Burt Munro.
Indian. Legend Of Speed. By George Begg.
ISBN No: 0-473-08906-8.
Available from your local book store or online through Amazon.

Here's a short excerpt from page 24.
Burt's aim was to cast a cylinder head:

>>"First a foundry was approached and asked how to go about making a pattern and core boxes for casting a cylinder head".

You need a pattern to give the outside shape of the head and as you have to be able to get it out of the moulding sand, it is usual to make this part in two or three pieces. As the cooling fins for instance protrude from each side and from the top you can't just pull a one-piece pattern out of the sand. It has to be removed in sections, one part at a time so as not to disturb the sand in the mould.
A core box is needed so that a passage for the inlet tract is cast into the head to let the mixture of air and petrol get into the cylinder past the inlet valve. Another core box is required to cast in the shape of the exhaust port, which like the inlet port is curved, into the head. These cores, made in a core box, are a mixture of sand and a bonding agent so that they can be placed in the mould and retain their position while the molten metal, cast iron in this case, is poured in.

Casting something like a cylinder head requires a high degree of skill, both by the foundry-man and the pattern maker, as an air cooled cylinder head is one of the more difficult objects with the close spacing of cooling fins and the bosses and projections to mount rocker boxes, carburettor and exhaust pipe. Pattern making is a skilled trade of its own, and to have been able to make these patterns and core boxes shows only one of the diversity of high-level skills Burt needed to acquire.
The patterns being made of wood, and Burt, being reasonably skilled at woodwork, at least had a head start over most laymen.

Doubtless he had his fair share of setbacks, but that is what kept him going. The more difficult the obstacles, the more determined Burt became. The foundry man would no doubt have said to Burt, when he tried to make a mould ready to cast, hat he had this or that problem, and so the pattern would have to be modified, but this is normal in such work.<<


Short excerpt from page 110.
>> Burt had many remarkable attributes that stand him apart from the rest of us mere mortals. Any one of them would have been enough to distinguish him in any society. He was a very skilled rider in a world where there are few. He was a gifted salesman and a gifted designer, being able to visualise the shape of a part and what would happen if he made a modification or designed a new way of doing something. 'Lateral thinking' is I think the modem term.

But the one attribute that stands him alone from most people who knew him was his sheer dogged persistence by never admitting defeat and never saying that something was too difficult for him to do with his limited workshop equipment or never saying he didn't know how to do a task, whatever it was. If he didn't know he just set out to learn. Whether it be a pattern to cast a cylinder head, to make a die to cast a piston in, to design and make a fibreglass streamlined shell or even how to ship a motorcycle to America and then tow it for thousands of miles to reach Bonneville at a minimum cost, it was all just a challenge.

To Burt, the only way to overcome any obstacle was by persisting and learning, and then persisting some more. <<

Note:
I have taken the liberty to reprint the above small portions of text from the book. I found that from the moment I started to read it I could not put it down, if you can acquire a copy, I bet your bottom dollar you'll do the same.

If you have moved on from being a novice to an advanced metal caster, you will understand only to well what Burt went through in his quest to cast - machine and manufacture is own parts (At minimal cost) for his wonderful old Indian Scout, it just proves that if you stick with it and don't give up on your dream, it will become a reality. I hope you can find a copy of the book, it is a great read.

It is called:
Burt Munro
Indian. Legend Of Speed. By George Begg.
ISBN No: 0-473-08906-8.
Available from your local book store or online through Amazon. And no, I'm not making a cracker from recommending this book.

You could be just like Burt Munro... just waiting to get stuck into some kind of project in your workshop.

Perhaps you need some more info to take you to the next step


Check out the library page -

We have everything you need to make your start in the art of hobby foundry.
You can make the start NOW.

                
          water pump module
CNC machined automotive water pump module, machined from marine grade aluminium alloy.     
                          

         
                  slave cylinder 
Custom hand machined green sand cast alluminium slave cylinder.                   
     

CNC machining is a great way to produce ten or more of the same size items, once the program has been set and tolerance checks have been made it is virtually full steam ahead. With general custom machining, the operations have to stop frequently to check tolerances of diameters both externaly and internaly, etc. It takes much more time to manufacture things, but if you are making only two or three identical items, then the above method is fine. Burt Munro was definitely a custom machining man, everything he made was virtually a one off special.                   


Home Machine Shops.
By Kevin Stith.

A profession or hobby that uses a power-driven machine tool such as a lathe or drill to shape metal, is known as machining. The person specializing in its use is called a machinist. A machine shop that is run from home is called a home machine shop.

Most machining operations are those that remove metal from an item or those that add metals. There are typical tools that are used in home machining. A lathe is a machine tool that creates sections in circles by rotating a metal work piece. A drill or punch press is used to remove metal in the form of a hole. Some other tools that are used in machining are saws, grinding tools and milling machines.

Advanced machining operations make use of electrical discharge, electro-chemical erosion and laser cutting to shape metal work pieces. Many car restorers have good home workshops and a wide array of tools. There are also individuals who build up a home workshop with the scheme of building some project in the long run. They eventually get sidetracked into building the machine tools and their accessories themselves.

There are magazines that provide advice on ways of solving problems being faced in the home shop. It is also possible to get information about a used lathe and other machine tools, in case the owner's manual is missing. These magazines and sites have a list of operating instructions on the various tools used. They also give detailed information about various manufacturers and their details.

Information about various new technologies that are being used, are also discussed. New techniques such as computer aided manufacturing processes, which have brought about a revolution in the machine shops, are also discussed. Home shop machinists can use this type of technological software to get the desired product results.

Machine Shops provides detailed information on Machine Shops, Automotive Machine Shop Repairs, Automotive Machine Shop Services, Automotive Machine Shops and more. Machine Shops is affiliated with Casting Molding Machining.
Article Source: http://EzineArticles.com/?expert=Kevin_Stith.
http://EzineArticles.com/?Home-Machine-Shops&id=407748


Useful Information About Machining
By Ross Bainbridge.

Machining in the industrial context refers to the use of power driven machine tools to shape metal. Metals are cut using various advanced machines and hence the process is often referred to as metal cutting.

Machining has various categories such as grinding, milling, turning, and drilling. In addition advanced technology has been developed to cut away material using electricity, chemicals, lasers, and water.

For grinding, a grinding belt or wheel is used, which is chafed against the work piece to remove material, for which water is used to avert the grinding wheel from getting hot and creating sparks. Grinding is often used for cutting metal pieces that are too hard to be machined.

However for cutting work pieces into asymmetric shapes, a manual machine would be an ideal aid. The process of manual machining is called as milling, and is good for general machining. However the milling process is less accurate, and not preferred as much as the turning or grinding machining process. The milling machine resembles a drill press, and the cutter looks like a drill bit that goes downwards in the piece to be cut. There are various different kinds of milling machines, and all serve in setting the depth of the cut.

Turning is another machine cutting process. However, the turning machining has a very unusual process of cutting, which is done on a lathe. Wherein the lathe turns the piece around, as a blade cuts away the required portion of the material.

Similarly drilling is a very common process of machining, which is used for cutting. The drilling process involves use of a drill or a drill press that has a drill bit on it, to cut away the work piece. Drill bits are available in many sizes and shapes, which help in cutting intricate shapes.

Nontraditional methods are also used for machine cutting such as a water jet technique, which is mainly used to cut softer materials, or materials that have cracks. Similarly the electrochemical machining technique is used for precise cutting. More over the advances in the machining process has been very crucial in the growth and development of the manufacturing sector.

Machining provides detailed information on Machining, CNC Machining, Casting Molding Machining, Precision Machining and more. Machining is affiliated with Automotive Machine Shop Services.
Article Source: http://EzineArticles.com/?expert=Ross_Bainbridge
http://EzineArticles.com/?Useful-Information-About-Machining&id=277149


Foundry Pattern Letters:
Are characters used in making foundry patterns for items such as plaques and signs.  These letters are made of metal so they are durable and may be used  over again in other patterns if they are carefully removed. USA Supplies: http://www.budgetcastingsupply.com/Pattern_Letters.htm


The Phoenix Foundry NSW Australia.
The Phoenix Foundry is based in Uralla, a small town in the New England Tablelands region of New South Wales. They specialize in creative bronze plaques. Click the link below to visit their web site. http://www.phoenixfoundry.com.au/index.html


How To Machine Magnesium?
By Ken Yap.

Magnesium has been used in manufacturing notebook computer frames, video cameras, digital cameras, PDAs and other consumer electronics products because of its high strength to weight ratio. When magnesium is alloyed with aluminum, the resultant material is very light and strong, and easily machinable.

The main concern in machining magnesium alloy is the danger of fire ignition when dry cutting. Fire may occur when the melting point of the alloy (400-600 degrees Celsius) is exceeded during machining. The small chips and fine dust generated during cutting are also highly flammable and pose a serious fire risk if not properly handled.

There are several points to note when machining magnesium:

Firstly, use a lower cutting speed when compared to cutting aluminum. The workpiece temperature goes up with an increase in cutting speed and also smaller undeformed chip thickness. In other words, the slower the machining speed and the larger the chips, the lower the workpiece temperature will be. Due to this reason, some companies have modified woodworking tools for machining magnesium so as to achieve larger chips and lower fire hazard.The cutting tools used should have relief and clearance angles that are sufficiently large to prevent unnecessary cutting tool-workpiece friction, thus lowering the heat generated during the cutting process.

Second, keep the machining center clean. Cleaning the machining centers regularly and storing the magnesium chips correctly are important aspects of machining magnesium. Keep a container of cast iron chips near by when machining magnesium, If fire occurs, smother the fire with the cast iron chips.

Thirdly, if coolants are necessary for high speed machining, do not use water-based lubricants. Instead use a light mineral oil, or a water-soluble cutting fluid such as Castrol Hysol MG specially formulated for machining magnesium. Some companies in Japan use semi-dry machining via a misting system.

The fourth point is to monitor the workpiece temperature during machining. Experiments were carried out using thermocouples mounted into the workpiece to monitor the workpiece temperature during machining. Dry cutting of magnesium alloy thin walls was achieved using cutting speed of 440m/min for roughing and 628m/min for fine finishing.

Despite the fire hazards, as competition from overseas low-cost production bases intensifies, and magnesium becomes increasingly used in electronics products, most machining job shops could very well find machining of magnesium a niche worth pursuing.

Author Ken Yap is a director of Suwa Precision Engineering Pte Ltd in Singapore and represents precision component manufacturers from Suwa, also called "The Oriental Switzerland" in Japan due to its Swiss resemblance for rich watch-making industry, its mountainous terrain and its precision component making industry. For more information on precision manufacturing, visit his homepage at http://www.suwaprecision.com. Article Source: http://EzineArticles.com/?expert=Ken_Yap
http://EzineArticles.com/?How-To-Machine-Magnesium?&id=121432

Following is a pure study of the art of CNC manufacturing.
This  has got to be seen to be believed.
Click the link now:
http://www.atomracing.se/6M.html
http://.www.atomracing.se/index.html
The engine took almost 13 months from the first sketch to completion; and it has been really challenging to analyze engine design in all areas. By modelling the whole engine in CAD-software there has been a perfect fit between the parts, the only part that had to be remade was the cam chain guides to get right chain tension. The most time-consuming part was the intake runners and throttle bodies. Longest delivery time was eight months.This project could never have been done without the manufacturing skills at
Mossbergs Mek.AB.


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