![]() ![]() Practically, this often means that you'll need the exact change gear to make the gear you want to.Īnd yet, prime numbered gears remain extremely popular in gearbox design. That is, the only way to multiply to get 73 is 73*1. A prime number, by definition, cannot be broken down to a product of any two numbers other than 1 and itself. Making a gear with a prime number of teeth can be an extra challenge. Likewise a 2 1 ratio is just 2:1, and any pair of gears (20:40, 30:60) will work. Rather than repeat out every option: 20/20, 21/21. The range of solutions grows even more when two of the change gears form a common ratio (i.e. ![]() Our change gear calculator for hobbers, shapers, and grinders, takes the math out of equation and allows you to get a range of solutions from just the Number of Teeth and Machine Constant. The machine itself (hobber, shaper, grinder) will also have an internal Machine Constant, so for a given tooth count, one needs to solve: Machine Constant / Number of Teeth = (A/B)*(C/D) ![]() These change gear calculations can be found in the Machinery's Handbook or tables from the OEM, or generated with this change gear calculator. These ratios use four gears arranged (A/B)*(C/D) to give the machine the correct gear ratio. But in gear-making equipment, like hobbers, shapers, and grinders, an exact ratio is required to make a gear with the right number of teeth. changing between "High/Low" or "Inch/Metric" might be possible by flipping a lever, or engaging one gear. Most machine tools have at least one gearbox, but the ability to set the gear ratio may vary wildly. ![]()
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