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