The shaft collar is certainly a simple, however important, machine component discovered in many power transmission applications, most notably motors and gearboxes. The collars are used as mechanised prevents, locating components, and bearing faces. The simple style lends itself to easy set up. Many people will be familiar with shaft collars through using Meccano.
1.Set screw style
　　The initial mass-produced shaft collars were arranged mess collars and were utilized mainly on series shafting 
in early processing mills. These early shaft collars had been solid band types, taking the help of square-head established screws that protruded from the collar. Protruding screws proved to end up being a issue because they could catch on a worker’s clothes while spinning on a shaft, and draw them into the machinery.
　　Base collars saw few improvements until 1910 through 1911, when William G. Allen and Howard Capital t. Hallowell, Sr, working independently, presented commercially viable hex socket mind set screws, and Hallowell patented a shaft collar with this safety-style established mess. His protection established collar was soon replicated by others and became an market standard. The invention of the protection set collar was the starting of the recessed-socket mess industry.
　　Established mess collars are greatest used when the material of the shaft can be softer than the set screw. Sadly, the arranged mess causes damage to the shaft – a flare-up of shaft material – which makes the collar harder to change or remove. It is definitely common to machine little flats onto the shaft at the established screw places to eliminate this problem.
2.Clamping style
　　Clamp-style shaft collars are designed to resolve the complications linked with the set-screw collar. They come in one- and two-piece designs. Instead of protruding into the shaft, the screws take action to shrink the collar and locking mechanism it into place. The convenience of make use of is preserved with this design and there is usually no shaft damage. Since the screws compress the collar, a standard distribution of force is certainly imposed on the shaft, leading to a holding power that is almost twice that of set-screw collars.
　　Although clamp-type collars work very well under fairly constant lots, shock a lot can cause the collar to change its placement on the shaft. This is usually credited to the very high energies that can be developed by a relatively small mass during impact, compared to a statically or gradually used weight. As an choice for applications with this kind of launching, an undercut can be made on the shaft and a clamp collar can be used to create a positive end that is certainly even more resistant to shock loads.
　　Maybe the most innovative and useful of the collars is normally the two-piece clamping collar. Two-piece clamp-style shaft collars can be taken apart or installed in placement without having to remove various other parts from the shaft. The two-piece style provides higher clamping push than a solitary piece clamp because all of the pressure is usually transferred straight into clamping the shaft. In single piece designs, the non-tightened part provides adverse push as it must hold the collar open up to allow it to be positioned onto the shaft. The solitary tightener must work against this drive as well as provide clamping push of its very own.
　　Two-screw clamps still offer pressure on two edges (one dimensions) only. Four (or even more) screw clamps provide push on four (or more) edges, and thus two sizes.
3.Axial clamps
　　A further processing of shaft collars is definitely where a solitary bolt and nut surrounds the shaft. The bolt (outdoor twine) is usually offers kerf cuts, producing fingers, which are pressurized onto the shaft as a nut is tightened over it. These are discovered on modern tripod legs and collets. If wrench-tightened, these can end up being very limited.
4.Drill collars
　　In drilling, a drill collar contains a large tube above the exercise bit in a drill string.