| CN Tower engineer visits Seneca | |
 |
Jamil Mardukhi, one of the structural engineers who designed the CN Tower in the 1970s, visited Seneca recently to speak with students in the School of Civil Engineering Technology. Now a vice-president at NCK Engineering Ltd., Mr. Mardukhi discussed the construction, engineering and the current revitalization of Toronto's tallest and most defining landmark.
Jamil Mardukhi with Changiz Sadr, Chair, Willowdale-Thornhill Professional Engineers Ontario Chapter and Professor Nanda Lwin, School of Civil Engineering Technology. |
Archive for April, 2010
CN Tower engineer visits Seneca
April 30, 2010Check our job boards!
April 30, 2010
… Check out other job board!
… Find a suitable job, more postings as we get them! Serving you, Jane Campus and JaneCampus.com!OCC Bike Building with Mastercam
April 30, 2010OCC Bike Building with Mastercam
paulasworld — January 05, 2007 — Watch Jim Quinn of OCC explain some of the behind the scenes machining done for the famous OCC bikes.
Die in SolidWorks
April 30, 2010Bronze
April 30, 2010Bronze
Traditional bronze is a copper alloy with up to 10% tin. The tin in bronze makes it more resistant to wear than unalloyed copper. Bronzes today are usually stronger and more resistant to corrosion than brass.
Contemporary bronzes are typically copper alloys that may contain silicon, manganese, aluminium, lead, iron and other elements, with or without tin.
The variations in bronze composition significantly affect its characteristics. Wearability, machinability, corrosion-resistance and ductility for deep drawing are often considered.
Bronze parts are typically used for bearings, clips, electrical connectors and springs. The Evans Company can stamp and deep draw from these alloys cost effectively, using high speed transfer and progressive presses.
Combro, or commercial bronze, is 90-10, or 90% copper/10% tin. It is frequently the least expensive, most easily obtained grade of bronze.
Aluminium bronze is a copper-aluminium alloy that may contain iron, nickel, and/or silicon for greater strength. It is used for tools and, because it will not spark when struck, for parts to be used around flammable materials. Aluminium bronze is frequently used for aircraft and automobile engine parts.
Manganese bronze is actually a brass containing manganese. It is often used for ship propellers because it is strong and resists saltwater corrosion.
G51-SCALING (Example 2)
April 30, 2010G51-SCALING
(Example 2)
O0010 ;
T1 M06 ;
G54 G90 G00 X0 Y0 ;
G43 Z0.1 H1 ;
S500 M03 ;
G51 X1.5 Y1.5 P2.;
M97 P10 ;
G28 G91 Y0 Z0 ;
M30 ;
N10 G00 X1. Y1. ;
G01 Z-0.5 F15. ;
X2. F20. ;
Y2. ; G03 X1. R0.5 ;
G01 Y1. ;
G00 Z0.1 ;
M99 ;
(Original geometry)
Take geometry shown by dashed line and double the size. Use a different work coordinate as the scaling center.
= Work coordinate origin
= Center of scaling
(Scaling center X1.5 Y1.5)
Complex Numbers
April 29, 2010Complex Numbers
- Add Complex Numbers:
- Multiply Complex Numbers:
- Divide Complex Numbers:
Add two complex numbers.
Multiply two complex numbers.
Divides two complex numbers.
CARBON STEEL
April 29, 2010CARBON STEEL
When ingots and bars are rolled to rod or sheet, the process can be done hot or cold. Cold rolled steel, or CRS, is often specified for deep drawn and stamped parts.
Cold rolled steels with high carbon content, over 0.55%, are strong but not very ductile. They are best used for springs and strong wire.
Used in Deep Draw
The most common steel sheet products for deep drawing are the cold rolled mild steels, which have better surface quality, mechanical properties and formability.
Cold Rolled (CRS) Carbon Steels such as AISI / SAE 1008 and 1010 are the steels most commonly used. (Experience shows that these two are interchangeable and the 1010 may be used if the1008 alloy is unavailable). Many of these parts are relatively low cost to begin, but need to be plated afterwards to protect against corrosion during storage or use.
Heat-treating
Heat-treating carbon steel changes its ductility, hardness, yield strength and impact resistance. It also changes its electrical and thermal conductivity. Depending on the part and its future use, we may stamp easily formable low alloy carbon steel, which is later heat-treated to change its mechanical properties. In other cases we would not stamp low-carbon steel unless it is already heat-treated, or we might recommend using high carbon steel, depending on a number of electrical and chemical considerations
| Steel Numbering There are 14 basic types of carbon and alloy steels specified by a numbering system that is shared by AISI and SAE. These types run from Carbon steel, such as 1010, to the higher alloy Nickel-Chrome-Moly series steels, like 4310, and Chromium steels, like 5130. The second two digits in this system, 10XX, represent the decimal percent of carbon in these alloys: 1010 has 0.10 % carbon. The stainless steels are in another steel series. |
G12 Example using I (Finished Radius)
April 29, 2010G12 Example using I
(Finished Radius)
O0010 ;
T1 M06 ;
G90 G54 G00 X1.0 Y1.0 ;
S1500 M03 ;
G43 Z0.1 H1 M08;
G12 Z-0.5 I0.4 D01 F15. ;
G00 Z0.1 M09 ;
G28 G91 Y0 Z0 ;
M30 ;
Only one pass is required for this example, so there is only an I value (circle radius) in the G12 line. G12 will use conventional rather than climb milling
We want to mill a 0.8” diameter 0.5” deep pocket using a 0.5” endmill. The picture shows the tool path for the code given.
Overview
April 29, 2010Overview
Traditionally, CAM has been considered as a numerical control (NC) programming tool, wherein two-dimensional (2-D) or three-dimensional (3-D) models of components generated in CAD software are used to generate G-code to drive computer numerically controlled (CNC) machine tools. Simple designs such as bolt circles or basic contours do not necessitate importing a CAD file.
As with other “Computer-Aided” technologies, CAM does not eliminate the need for skilled professionals such as manufacturing engineers, NC programmers, or machinists. CAM, in fact, leverages both the value of the most skilled manufacturing professionals through advanced productivity tools, while building the skills of new professionals through visualization, simulation and optimization tools.
