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Expert's Corner — compressor

TIP: Sanding with a Random Orbit Sander

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TIP: Sanding with a Random Orbit Sander

There are two large categories of random orbit sanders: electric and pneumatic (compressed air.) Both work well, though you need a fairly large compressor to power a pneumatic sander adequately. Random orbit sanders are easy to use; you don’t need much instruction. But there are two general rules to keep in mind for achieving the best results: Let the weight of the sander do the work. If you press down on it, you’ll leave deeper and more obvious “squigglies” that then have to be sanded out. Simply move the sander slowly over the surface in some pattern that covers all...

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Using a Viscosity Cup

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Using a Viscosity Cup

Finishes vary in viscosity (thickness in liquid form) depending on their type and formulation, and especially in temperature differences. The viscosity is thicker when the finish is cold and thinner when the finish is warm. To measure viscosity dip a viscosity cup into a finish so the cup is full. Then lift the cup out of the finish and begin timing the drainage with a stopwatch. When the stream breaks, indicating that the cup is empty, stop the timer. The number of seconds is the measure of the viscosity. There are many types of viscosity cups. Some are quite expensive....

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Filters for an Air Compressor

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Filters for an Air Compressor

You should be aware that moisture and oil can get into the air line and spray gun from your air compressor and mess up your work. This is one of the disadvantages of using an air compressor instead of a turbine to supply air. There’s no possibility of moisture or oil being transferred from a turbine. To reduce the possibility of moisture getting into the air ine, drain the compressor’s tank on a regular basis. Oil usually enters the system through deteriorated gasket seals, so you shouldn’t have an oil problem unless the compressor is old. To deal with both...

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