Quantcast RECESSED

Share on Google+Share on FacebookShare on LinkedInShare on TwitterShare on DiggShare on Stumble Upon
Custom Search
 
  
The steel shank is designed to withstand considerable twisting force in proportion to its size, and the tip of the blade is hardened to keep it from wearing. Standard screwdrivers are classified by size, according to the combined length of the shank and blade. The most common sizes range in length from 2 1/2 to 12 inches. There are many screwdrivers smaller and some larger for special purposes. The diameter of the shank, and the width and thickness of the blade are generally proportionate to the length, but again there are special screwdrivers with long thin shanks, short thick shanks, and extra wide or extra narrow blades. When using a screwdriver, you should select the proper size so that the blade fits the screw slot properly. This prevents burring the slot and reduces the force required to hold the driver in the slot. Keep the shank perpendicular to the screw head (fig. 1-48). RECESSED Recessed screws are now available in various shapes. They have a cavity formed in the head and require a specially shaped screwdriver. The clutch tip (fig. 1-47) is one shape, but the more common include the Phillips, Reed and Prince, and newer Torq-Set types (fig. 1-49). The most common type of screw found is the Phillips head. This requires a Phillips-type screwdriver (fig. 1-47). Phillips Screwdriver The head of a Phillips-type screw has a four-way slot into which the screwdriver tits. This prevents the screwdriver from slipping. Three standard-sized Phillips screwdrivers handle a wide range of screw sizes. Their ability to hold helps to prevent damaging the slots or the work surrounding the screw. It is a poor practice to try to use a standard screwdriver on Figure 1-48.-Positioning screwdrivers. Figure 1-49.-Comparison of Phillips, Reed and Prince, and Torq–Set screwheads. a Phillips screw, because both the tool and screw slot will be damaged. Reed and Prince Screwdriver Reed and Prince screwdrivers are not interchangeable with Phillips screwdrivers. Therefore, always use a Reed and Prince screwdriver with Reed and Prince screws, and a Phillips screwdriver with Phillips screws, or a ruined tool or ruined screwhead will result. To distinguish between these similar screwdrivers, refer to figure 1-50. The Phillips screwdriver has about 30-degree flukes and a blunt end, while the Reed and Prince has 45-degree flukes and a sharper, pointed end. The Phillips screw has beveled walls between the slots; the Reed and Prince, straight, pointed walls. In addition, the Phillips screw slot is not as deep as the Reed and Prince slot. Figure 1-50.-Matching cross-slot screws and screwdrivers. 1-29



Aviation News
Australian Military’s EC135 T2+ Completes First Flight
The first Airbus EC135 T2+ helicopter in a planned fleet...
aviationtoday.com
Raytheon Absorbs Sensintel, Ups UAS Portfolio
Photo: Raytheon [Avionics Today 01-26-2015] Raytheon has acquired the privately...
aviationtoday.com
Exelis Wins Redesign Contract for US Navy’s ALQ-99 Tactical Jammer
U.S. Navy ALQ-99 aircraft. Photo: U.S. Navy by Mass Communication...
aviationtoday.com
Aircraft Asset Assessment B737-800
Market Presence. In the context of re-engining from both manufacturers,...
aviationtoday.com
FAA to Airlines: E-cigs in Checked Bags are Fire Risk
January 23As the popularity of e-cigarettes increases, the FAA wants...
faa.gov
FAA to Issue New Guidance on Sleep Apnea
January 23The Federal Aviation Administration (FAA) continually works with the...
faa.gov
FAA Grants Two More UAS Exemptions
January 23-The Federal Aviation Administration continues to allow expanded commercial...
faa.gov
F/A-18 Super Hornet Infrared Search and Track System Approved for Production
IRST21, shown on the F/A-18E/F. Photo: Lockheed Martin   [Avionics...
aviationtoday.com
Exelis Inks Contract with General Atomics for MQ-9 UAS Ejector Rack
MQ-9 UAS. Photo: U.S. Air Force [Avionics Today 01-22-2015] Exelis...
aviationtoday.com
Boeing Ready to Show Off New Maritime Surveillance Aircraft
Boeing Maritime Surveillance Aircraft (MSA) test flight take off. Photo:...
aviationtoday.com
Lockheed Martin Delivers eCASS System to Troubleshoot U.S. Navy Aircraft
Marine using eCASS system. Photo: Lockheed Martin [Avionics Today 01-22-2015]...
aviationtoday.com
Japan Ministry of Defense Selects Northrop Grumman Aircraft to Up ISR
The Northrop Grumman RQ-4 Global Hawk. Photo: Northrop Grumman  [Avionics...
aviationtoday.com
NATS Reports CO2 Reduction Saves Millions
Flosys, a tool that analyzes the environmental efficiency of flights,...
aviationtoday.com
Airbus’ focus on “thermoplastic” composite materials brings environmental and production improvements
While the use of carbon-fibre reinforced plastic (CFRP) has become...
airbus.com
ATAC Deploys Warfighters to Jacksonville for US Military Training
ATAC Aircraft. Photo: ATAC [Avionics Today 01-16-2015] Airborne Tactical Advantage...
aviationtoday.com
DAC Inks Distribution Deal with Mid-Continent Instruments and Avionics
Photo: DAC International [Avionics Today 01-15-2015] DAC International has reached...
aviationtoday.com
Engility Awarded Contract to Support the FAA’s NextGen Efforts
Photo: Engility Corporation Facebook [Avionics Today 01-15-2015] Engility Holdings has...
aviationtoday.com
LATAM Civil Aviation Entity Purchases VSAT Mesh Solution From Advantech Wireless
Advantech Discovery series VSAT hub. Photo: Advantech [Avionics Today 01-14-2015]...
aviationtoday.com
Airbus in 2014 and beyond: “Delivering on commitments, preparing the future”
Airbus has set its sights on another busy year of...
airbus.com
New Airbus aircraft list prices for 2015
Price adjustment for Airbus’ modern, comprehensive and fuel-efficient aircraft Family...
airbus.com


Privacy Statement - Copyright Information. - Contact Us

comments powered by Disqus

Integrated Publishing, Inc.
9438 US Hwy 19N #311 Port Richey, FL 34668

Phone For Parts Inquiries: (727) 755-3260
Google +