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Graphical Construction – A line tangent to two circles.

A scene from tonight’s video

Very often it is necessary to draw a line that is tangent to two circles. A pulley going around two pulleys, or a rope tied around a cylinder and pulled around a pulley are but two examples. It was something I had to draw when I was determining the

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Graphical Construction – A Circle Tangent to two lines.

A scene from the Video

A new graphical construction video was posted tonight. This shows how to make a circle that is tangent to two lines. Things are starting to get a little more complicated now and we will be using some of the techniques we have already learned to be able to draw

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Graphical Construction – A parallel line through a point and equal divisions on a line.

Dividing a line into equal divisions.

A new graphical construction video was posted tonight. This shows how to make parallel lines through points and that procedure is used to divide a line into equal parts.

These procedures are published in several books and were taught back in the days when hand drafting was taught.

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Graphical construction – A line through a point and tangent to a circle.

Scene from the video.

This is another post in the series of solving graphical problems. I have yet to talk about why these skills are important and that will be in an post soon. However, if you look around at man-made things around you, you will notice very few are simple “boxes”. Almost everything

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Graphical Construction – Bisecting an Angle

Bisecting an Angle.

In the last post I bisected a line, so in this post we will bisect an angle. Again this is trivial in CAD, but a little more complicated in”real life”. Basically all that is being done is to: First, make the two legs of the angle the same length and then

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Graphical Construction – Bisecting a Line

The third step: Drawing a line perpendicular to the edge of the paper

This is the first of a new series of videos showing how to solve special drawing problems in CAD but more importantly also manually while laying out a project in sheet metal or some other material. Today’s example is really three

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Three is right for me.

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Three blades rotated a random amount.

Three sounds like a strange number, but it turns out to be the perfectly balanced number when considering spinning objects. Most electricity is used to spin motors and almost all of it is generated by spinning alternators. Three phase is very common in electricity. Three blades are often

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Circles and Cycles

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Sine and Cosine.

I created a video over the weekend showing the relationship of a sine wave to a cosine wave. The cosine wave is shifted 90 degrees from a sine wave. (Think Capacitors and Inductors!!! Deja Vu all over again!!!)

First, I create the two waveforms using the unit circle method and CAD.

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Using CAD in initial design – More work on the Popsicle Crane

The Base Drawing of the Crane.

People normally think of CAD drawings being used to produce finished plans. While that is probably the main use for drawings, CAD is very useful in all stages of design including conception and analysis. I have decided that I will do more work on the Popsicle Crane and

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Capacitors and Alternating Current.

Rate of Change in a Sine wave.

One of the important concepts I hope I have driven home in the two previous posts about capacitors is the current in and out of a capacitor is related to how much difference there is between the source and voltage stored in the capacitor. We are going

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