123D Design Tutorial: Alloy wheel or steering wheel Before using these instructions, it is very helpful to watch this video screencast of the CAD drawing actually being done in the software. Click this link for the video instructions Start in TOP view, and select ‘Sketch Circle’ Click on the grid to start sketching and click on one of the large square crosses for the centre of your circle. Draw a circle 50mm diameter Use Sketch Offset to draw another circle 5mm outside the original circle, so your sketch looks as below. You will now start drawing the spoke sections of the wheel so that it looks like this Select Sketch Three Point Arc and click on your wheel to add to this sketch Click to specify the start point – 2 small squares to the left of the wheel. Then the end point – make this 2 small squares to the right of the wheel Drag the mouse along the arc until the mouse pointer is one square above the centre of the circle, then left click once to fix this point on the arc. Page 1 of 6 Diane Burton, STEM Outreach.
[email protected] Click on the same start and end points to draw the next arc so it mirrors the first arc. Select the point on the arc one square below the centre of the circle. Now start the next arc 2 small squares above and below the circle – point on the arc, one square to the side of the centre. Sketch the final arc Your drawing will look like this.