Lets start with a gear tooth size of 10 mm I want a gear with 5 teeth on it so the circle will be 10 x 10mm round (circumference)= 100 mm To draw that circle I need to find the diameter so I use a bit of maths and a calculator a divide the circumference (100 mm) by Pi = 3.142 This gives me a diameter of 31.8mm I can draw this with a compass and then fit exactly 10 circles 10mm diameter round it with my compass. All the teeth that are going to mesh, (connect), together must be the same size so calculate your smallest gear first.ģ. How big/small do we need the gear teeth to be, (diameter) - The smaller the gear the smaller the teeth need to be. 2.We can now easily sort out some simple maths to make our gear
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