Friday, November 5, 2010

CrazyEngineers Forum

CrazyEngineers Forum

Sand casting processes

Posted: 05 Nov 2010 05:43 AM PDT

Sand Casting Processes
For Case(A):
Bottom board is placed either boundary moulding from or on the floor making the surface even. The drag moulding flask is kept upside down on the bottom board. Dry facing sand is sprinkled over the board. Rest of the drag flask is completely filled with back up sand and uniform the rammed to compact the sand. The remaining of sand should be done properly. So as to compact it to hard , which makes the escape of gases difficult not to lose.
So that mould could not have enough strength . After the ramming is over , the excess of sand in the flask is completely scraped using a flat bar to the level of the flask edges. Now with a vent wire which is a wire of 1-2mm diameter with a pointed end, vent holes are made in the drag to he full depth flask as well as to the pattern to facilitate the removal of gases during casting solidification. This complete the preparation of the drag.


For case B:
We finished the drag flask is now rolled over to the bottom bolt exposing the pattern and cope of the pattern is placed over the dragged pattern.

For case C:
The cope flask on the top of the drag is rotated aligning again with the help of the pins. A screw pin for making the screw passage. The sand is thoroughly rammed and excess sand scrap and vent holes are made over all in the cope as in the drag. The screw pin and the riser pin are carefully with drawn from flask the mould is now ready.
for more details

http://engineeringhut.blogspot.com

Manufacturing processes

Posted: 05 Nov 2010 05:26 AM PDT

Topic: Tool design(Mechanical Engineering)

Manufactuing Processes:
Introduction:
Manufacturing involves turning raw material to finished products, to be used for various purposes. There are a large number of processes available. These processes can be broadly classified into four categories.
1: Casting processes
2: Forming processes
3: Fabrication processes
4: Material removal processes
Casting Processes
These processes only processes where the liquid metal is used. Casting is also the oldest known manufacturing process.
Basically it consists of inducing the molten metal into a cavity of mould of the required form and allowing the metal to solidify.The object after solidification removed from the mould. Casting processes are universally used to manufacture a wide variety of products. Casting is the most flexible and cheapest method and given high strength of rigidity to the parts which are difficult to produce by other manufacturing processes.
The principle process among these sand casting where sand is used as the raw material. The process is equally suitable for the production of a small batch as well as on a large scale.Some of the other classified casting processes for specialized need are
·Shell mould casting
·Precision mould casting
·Plaster mould casting
·Permanent mould casting
·Die casting
·Centrifugal casting
Forming Processes:
These are solid state manufacturing processes involve minimum amount of material wastage. In forming process metal may be heated to temperature which is slightly below. This solidify temperature and large force is applied such the material flows and act in desired shape. The desire shape is controlled by means of a set of tool ties and dies, which may be closed during manufacturing.
These processes are normally used for large scale production rates. These are generally economical and in many cases improve the mechanical properties. These are some of the metal forming processes.
·Rolling forging
·Drop forging
·Press forging
·Upset forging
·Extrusion forging
·Wire forging
·Sheet metal operation
Fabrication Processes
These are secondary manufacturing processes where the starting raw materials are produced by any one of the previous manufacturing processes desired. Its assembly involve joining pieces either temporary or permanent. So that they would be perform the necessary function. The joining can be achieved by either or both of heat and pressure joining materials.
Many of the steel structure construction, we see are first rolled and then joined together by a fabrication process are
·Gas welding
·Electric arc welding
·Electrical resistance welding
·Thermo welding
·Brazing welding
·Soldering welding
·Cold welding
Material removal processes:
These are also a secondary removal manufacturing process, where the additional unwanted material is removed in the form of chips from the blank material by a hard tools so as to obtained the final desired shape.
Material removal is normally a most expensive manufacturing process. Because more energy is consumed and also a lot of waste material is generated in this process. still this process is widely used because it deliver very good dimensional accuracy and good surface finished. Material removal process are also called machining processes. Various processes in this category are
·Turning
·Drilling
·Shaping and planning
·Milling
·Grinding
·Broaching
·Sawing
·Trimming

for more details just click here
http://engineeringhut.blogspot.com

Mobile Number Portability Likely To Be Delayed Until January 2011

Posted: 05 Nov 2010 05:22 AM PDT

Even after official confirmation from TRAI minister A Raja, the MNP has not seen a ray of hope in India.

In a recent meeting between the GSM operators and the government, GSM operators demanded that the MNP should not be implemented until the first week of Jaunary 2011, because during the period November - January (first week) the operators operate at peak loads because of the festival season. It could result into poor experience by the experience with the Mobile Number Portability.

The CDMA operators and newest GSM operators are very much ready for the MNP. They are technically capable and do not want to wait until January 11.

The earlier news was that the MNP will finally go live in India on November 25. But I'm very sure, it's not going live on November 25, in any case.

What's your opinion about this news?

Message from Voltaire

Posted: 04 Nov 2010 10:46 PM PDT

My dear friends
Happy Diwali to all!
Some of you may have noted my absence. This is due to the fact that I have been traveling overseas for a few weeks. I am starting a significant engineering project in a new international company in a new venture. That is all I can tell you right now.
Unfortunately it also means that I shall have very little time for anything else. Be assured that I shall visit whenever I can to track your progress and to gauge the already significant improvements that have been happening here.
Personally I can think of no better time to do this venture than in this blessed Diwali. May Vishnu protect us all and Lakshmi open her hand wide to us. There may be job opportunities to some of you here and when the time comes I shall be in contact with Biggie to discuss that. Until such time please do not contact me in this regard. Let us all respect the forum rules.
Clear your minds and strive for purity in this time of renewal and hope.
Voltaire

Obama visit to India will solve outsourcing issue?

Posted: 04 Nov 2010 09:04 PM PDT

Most probably Obama(US president) will visit INDIA on 6th of November. And it is expected that Nasscom will raise the outsourcing issues and will discuss on it as anti-outsourcing measures are adopted by the US president Mr.Barack Obama and also ohio's ban outsourcing of IT projects.

What do you think will this meet solve the issue of outsourcing and also what are the expected issues to be discussed?

Share an all-in-one Video Converter for Mac OS X

Posted: 04 Nov 2010 08:30 PM PDT

More and more multimedia tools are available for the Mac users, and sometimes it is really hard to choose the proper one that can meet our need. Now I’d like to share a powerful, easy-to-use and full-featured Video Converter for Mac OS X—4Easysoft Mac Video Converter.
With it, you can convert General Video such as FLV, WMV, AIV, 3GP, MP4 and HD video such as TOD, MOD, TS, M2TS, MTS, MOV, etc. like a iMedia converter for Mac: extract audio from your videos to MP3, MP2, AAC, OGG, WMA, FLAC and more like a Video to Audio Converter; and edit your videos by functions of Edit, Trim, Crop, Merge several video files into a single file.

The following are the detailed guide about it:
Preparation: Download and install 4Easysoft Mac Video Converter



Step 1:Click “Add File” button, you can add the files that you want to convert.
This converter can convert all sorts of videos, including General Videos (FLV, WMV. SWF, MP4, RM, RMVB, AVI, 3GP, etc. ) and HD videos (TOD, MOD, M2TS, MTS, TS, MP4, MOV, RM...) to diverse players, like iPod, iPhone, iPhone OS 3.0, PSP, Zune, Creative Zen, Wii, even Gphone and etc…
Step 2:Set output settings.
From the profile drop-down list, you can choose the output format you want.
Click the “Browse” you can choose the output destination.
Click “setting” button, a windows pops up and you can change the Encoder, Resolution, Frame Rate, Bitrate of video as well as Encoder, Sample Rate, Channels, and Bitrate of audio



Step 3:Click “Start” button to begin the conversion.

Editing Tips:
You can edit your videos by using this converter, such as:
1. Effect—adjust your video brightness, saturation and contrast according your preference
2. Trim—get any part of your video to convert
3. Crop—get your players suitable play region video



4. Merge—enjoy a long video from several clips
5. Snapshot—capture any image you like in the videos
The more useful tools here may help you:
HD Converter
DVD to Video Converter
Total Video Converter
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