On the latest series of Mech Minutes, we will be reviewing the features that must be considered when selecting a shaft in your application. Shafts are typically used for three main reasons – support, transmitting power, or to transport a load.
‘Linear’ shafts are utilized in load transport applications. These shafts mate with complementary accessories such Linear Bushings. Linear shafts are composed of steel, but standard carbon steel is relatively soft. The direct contact with mating accessories can cause the steel to wear prematurely. Because of this Misumi induction hardens (also known as case hardening), it’s linear shafts to withstand the wear of the bushing riding directly on the shaft.
‘Rotary’ shafts are designed to be used in power transmission applications. Oftentimes ‘Rotary’ and ‘Drive’ shafts are used interchangeably. While they’re used in identical applications, there are important differences. These will be discussed in a subsequent episode. Misumi’s Rotary shafts offer a plethora of alterations in order to accommodate the various mating components. Wrench flats, keyways, and retaining ring grooves are only a few of the standard alterations offered to join your rotary accessories.
‘Posts’ are commonly used as support features within an application. Also known as ‘stand-offs’, these shafts are meant for static support. Because posts and its mating components are not in motion, tolerances are not as critical – leading to a reduced cost.
‘Rods’, also be referred to as ‘Bar Stock’, are the last of the four main types of shafting. These are the most economical solution for general and unique applications. Misumi’s Rod selection offers the widest selection of material including Titanium, Brass, various Resins, and many others.
Beginning with the proper shaft in your design will ensure your application will perform as expected. Not to mention, prevent overdesigning – thus saving precious dollars.
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