NYC CNC – Weekly Machine Shop How-To Videos!

If you are like me, then you feel that what you learned about machining in school might not be enough for your daily activities. This channel is exactly what is needed to understand the day to day activities of a machine shop. Tips, how to videos and also Fusion 360 tutorials, you can see the whole life of a part, from CAD to the finished product on this channel.

Thank you John Saunders for sharing your experience in your awesome machine shop!

NYC CNC Youtube channel

NYC CNC website

NYC CNC on twitter

Material Behavior – Georgia Institute of Technology on Coursera

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I just finished this course on Material Behavior on Coursera and I can say that it was a great experience. If you want to freshen up on your materials knowledge or you are currently studying this and want a different perspective, I recommend you take this course.

The course is offered by Georgia Tech and it is taught by Thomas H. Sanders, Jr. (Regents Professor). I have to be honest: although the course is full of information it might seems rather slow and boring sometimes and if you do not pay attention or even write down the important topics, it will be hard to pass the tests at the end of every week. The course goes through the most important aspects of materials like atomic structure, crystalline structure, defects etc.

We all know that these massive online open courses are sometimes just marketing schemes for unknown universities from around the world that do not offer a lot of value. This course is not like that, and everyone that will make it through to the sixth week will have a deeper knowledge of materials.

The student effort is listed at about 2 hours and 30 minutes for most weeks, and I have to say that was not enough for me, I guess for someone new to the material behavior, this course might well take up 4 or 5 hours a week with a little internet search on different topics mentioned by the professor.

In conclusion, I highly recommend this course and I found it to be one of the best open courses floating around on the internet.

Material Behavior – Georgia Institute of Technology

Materials Science

Material hardness tests

Material science tests

Wikipedia describes hardness as: “a measure of how resistant solid matter is to various kinds of permanent shape change when a compressive force is applied. Some materials (e.g. metals) are harder than others (e.g. plastics). Macroscopic hardness is generally characterized by strong intermolecular bonds, but the behavior of solid materials under force is complex; therefore, there are different measurements of hardness: scratch hardness, indentation hardness, and rebound hardness.”

According to my sophomore undergrad year material sciences textbook there are three widely used hardness tests: Brinell, Vickers and Rockwell. Fortunately I found an excellent YouTube channel where we can see each of these tests performed. Enjoy:

The Brinell method

The Rockwell procedure

The Vickers method

External resources:

Guidelines to hardness testing by Hegewald & Peschke

Wikipedia links page of the three hardness tests above and many others

MaterialsScience2000 YouTube channel