#Bosch s7 drill stand manual driver
The Phillips drive features a much shallower socket than Robertson or hexagon drives, which did allow the driver to disengage under excessive force. The Phillips drive is the archetypal cruciform drive type, and is arguably the most well-known drive type in the world.
As with the earlier Robertson drive, hexagon drives had the potential to engage a little too well with a fastener, and could cause damage through over-tightening.
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Allen in 1910, but became particularly widespread during the early 20th century. The instantly recognisable hexagon drive, also known as the hex drive or the Allen drive, likely existed in an unofficial form several years before being patented by W. However, when the Robertson Drive was first introduced, torque limitation on tooling was non-existent, meaning that the Robertson drive had the potential to cause significant damage to tooling and fasteners by over-tightening. The Robertson drive was designed to give very strong engagement between the fastener and the driver, with a deep square socket drive which discouraged driver disengagement under stress this allowed high levels of torque to be transmitted, especially when compared to a slotted drive. The goal of the Robertson drive was to improve upon the most dominant screw type of the time by preventing drive slippage, which was, and still is, a common complaint with slotted drives. Robertson, injured himself when his slotted screwdriver slipped from the head of a slotted screw. The Canadian square-shaped Robertson drive was invented in 1908, shortly after its inventor, P. The first slotted drives were cut into the top of a simple nail with a saw or file - this simplistic design was effective and cheap to manufacture, and has remained in use for over 400 years. The slotted drive was a renaissance-era development which enhanced rotational leverage and simplified the installation process for fasteners. The rudimentary slotted drive was the archetypal threaded fastener drive on some of the very first threaded screws. Shifting the torque limiting safety features from the screw drive to the power tool itself also allowed these drives to be further developed into even more effective torque transmitting heads, such as the Torx drive.ĭrive Type Timeline Pre-1600 - The Slotted Drive In applications where cam-out was advantageous, fasteners such as Phillips and Pozi drives were widely used, but as more sophisticated torque limiters were implemented into power tools and over tightening became less of an issue, high-torque socket drives such as hexagon (Allen) drives saw a resurgence.
#Bosch s7 drill stand manual drivers
Originally, with the introduction of electric power tools, the design of screws was developed to encourage cam-out (the disengagement or slippage of a driver from a fastener head) at high torque levels, this was because high-torque drivers could damage fasteners and housings when over-tightened, and disengagement from the driver was intentionally implemented as a safety feature. In many cases, unique fastener attributes can allow for innovations in product design and security, but in some cases, customers argue that standard components would probably have sufficed - This was famously seen when technology giant Apple launched its patented ‘pentalobe’ fasteners, which came under heavy criticism for being unnecessarily restrictive back in 2009. Company-specific designsĪnyone who has ever put together flatpack furniture will be familiar with the weird and wonderful screw types which companies invent for their products.
Arguably, the more hard-to-find a security driver is, the more effective it is at its job. In total contrast with almost all other drive types, security drives are interesting in that their appeal lies in the fact that they are deliberately inconvenient to operate. A fastener that cannot be loosened without special tooling is inherently resistant to tampering, and Security Screws are specifically designed to be difficult to operate without the correct tooling. One advantage for the use of unusual drive types is the added security that an uncommon drive type can provide. An engineer's toolkit is incomplete without an abundance of screwdrivers and drive bits for all manner of different screw drives, so why is there not just one uniform type? Whether they were developed at different times, for different purposes, or just by different companies, there are numerous reasons for the myriad of fastener drive types on offer. Why do we need so many drive types?įasteners are available in innumerable different shapes and sizes, and one of the most common permutations is drive type. What is the Best Screw Drive? Phillips, Flat Head, Pozi and Torx.
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