Shaft collar: Difference between revisions
No edit summary |
Introduced a brief history into the set screw collar section. |
||
| Line 2: | Line 2: | ||
==Set screw style== |
==Set screw style== |
||
The first mass-produced shaft collars were [[set screw]] collars and were used primarily on line shafting in early manufacturing mills. These early shaft collars were solid ring types, employing square-head set screws that protruded from the collar. Protruding screws proved to be a problem because they could catch on a workmen’s clothing while rotating on a shaft, and pull them into the machinery. |
|||
| ⚫ | |||
Shaft collars saw few improvements until the early 1900’s when Howard T. Hallowell created the first recessed head socket set screw shaft collar. Hallowell received a patent on his safety set collar, which was soon copied by others and became an industry standard. The invention of the safety set collar was the beginning of the recessed-socket screw industry.<ref>http://www.ruland.com/a_articles_getting_a_hold.asp</ref> |
|||
| ⚫ | Set screw collars are best used when the material of the shaft is ''softer than the set screw''. Unfortunately, the set screw causes damage to the shaft – a flare-up of shaft material – which makes the collar harder to adjust or remove. It is common to machine small flats onto the shaft at the set screw locations to eliminate this problem. |
||
==Clamping style== |
==Clamping style== |
||
| Line 10: | Line 14: | ||
<references/> |
|||
[[Category:Hardware (mechanical)]] |
[[Category:Hardware (mechanical)]] |
||
Revision as of 16:58, 18 August 2010
The shaft collar is a simple, yet important, machine component found in many power transmission applications - most notably motors and gearboxes. The collars are used as mechanical stops, locating components, and bearing faces. The simple design lends itself to easy installation. Many people will be familiar with shaft collars through using Meccano.
Set screw style
The first mass-produced shaft collars were set screw collars and were used primarily on line shafting in early manufacturing mills. These early shaft collars were solid ring types, employing square-head set screws that protruded from the collar. Protruding screws proved to be a problem because they could catch on a workmen’s clothing while rotating on a shaft, and pull them into the machinery.
Shaft collars saw few improvements until the early 1900’s when Howard T. Hallowell created the first recessed head socket set screw shaft collar. Hallowell received a patent on his safety set collar, which was soon copied by others and became an industry standard. The invention of the safety set collar was the beginning of the recessed-socket screw industry.[1]
Set screw collars are best used when the material of the shaft is softer than the set screw. Unfortunately, the set screw causes damage to the shaft – a flare-up of shaft material – which makes the collar harder to adjust or remove. It is common to machine small flats onto the shaft at the set screw locations to eliminate this problem.
Clamping style
A clamping style collar is the other option. They come in one and two-piece designs and solve the problem that set screw collars create. Instead of protruding into the shaft, the screws act to compress the collar and lock it into place around the shaft. The ease of use is maintained with this design and there is no shaft damage. Since the screws compress the collar, a uniform distribution of force is imposed on the shaft, leading to a holding power that is nearly twice that of set screw collars.
Perhaps the most innovative and useful of the collars is the two-piece clamping collar. For installation, the user does not need to slide the collar over the shaft, but can install in place. The two-piece design is also easy to customize and provides the most holding power of all shaft collars.