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pedal operated wet grinder pdf

One way to solve the large energy losses of pedal power generators is not to produce electricity at all but power devices mechanically, whenever possible. Another way - the only way for devices that cannot be powered via a direct mechanical connection because they do not rely on rotary motion - is to make the generation of electricity more efficient. This can be done by building a pedal powered generator from scratch instead of using a road bicycle, or by ditching one or several electronic components in the power transmission chain. All approaches can be combined, resulting in a pedal power unit that can power a multitude of mechanical devices and generate electricity comparatively efficiently.

Direct Mechanical Power Transmission

Fender-Blender-ProMany machines could be powered by a direct mechanical connection, though it generally means adapting the device so that it can work independently of electricity. However, stationary pedal machines with direct mechanical power transmission - although they were common in the old days - are not available commercially in the western world.

The only exception seems to be the Fender Blender, a pedal powered machine used to make smoothies (picture on the right). However, old school bicycle machines are now being designed both by amateurs in the western world and non-profit organisations in the developing world.

In Guatemala, Mayapedal has been building some 2,000 pedal powered machines from old bicycle parts since 2001. To date, the NGO has built pedal powered water pumps, grinders, threshers, tile makers, nut shellers, washing machines and blenders. These cost only $40 to $250 to make. Their contraptions have become more sophisticated and even cheaper to build over time, evolving from adapted bicycles to pedal powered machines built from scratch which incorporate a flywheel, and are capable of driving different types of appliances.

Another example is the VitaGoat Cycle Grinder developed by the Canadian NGO Malnutrition Matters. The pedal powered grinder forms part of a complete food processing system which is delivered to developing countries in Asia and Africa. Chocosol teaches local people in Mexico to build their own pedal powered cacao bean grinders and the Canadian promoters also use the technology in their shop in Toronto. The Full Belly Project designs human powered nut shellers for farmers in Africa.

Pedal powered mill tresher2 Then there are the many contraptions built by individuals too: the pedal powered washing machines by Alex Gadsden and Homeless Dave, the pedal powered soap blender by Frederick Breeden, or the pedal powered apple grinder by Ben Polito. Similar machines have also been built outside the US. Some have concentrated on restoring and putting to use antique machines, like Blue Ox Millworks.

One obvious disadvantage of designing a pedal powered machine for every application in the household, farm or workshop is that you need a lot of space. Furthermore, designing a pedal power unit for every tool might become labour-intensive, costly and energy-intensive.

This is not as much of a problem in cases of small-scale industrial use, where few machines are required in order to manufacture a product. A good example of this is the pedal powered soap blender mentioned above. For this reason, a pedal powered blender could be a realistic option for small businesses, such as a smoothie bar. However, when more tools are needed and space is restricted, as is often the case, we need to find ways to get around this problem. One solution is to use pedal power to generate electricity which can then be used to power different devices. However, this approach is highly inefficient with energy losses of up to more than 70 percent and should be avoided whenever a device can be powered in a mechanical way.